darshan-posix.c 45.5 KB
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/*
 *  (C) 2009 by Argonne National Laboratory.
 *      See COPYRIGHT in top-level directory.
 */

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#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdarg.h>
#include <string.h>
#include <time.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/uio.h>
#include <pthread.h>
#include <sys/mman.h>
#include <search.h>
#include <assert.h>

#include "darshan.h"
#include "darshan-config.h"

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#ifndef HAVE_OFF64_T
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typedef int64_t off64_t;
#endif

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extern char* __progname_full;

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#ifdef DARSHAN_PRELOAD
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#define __USE_GNU
#include <dlfcn.h>
#include <stdlib.h>
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#define DARSHAN_FORWARD_DECL(name,ret,args) \
  ret (*__real_ ## name)args = NULL;

#define DARSHAN_DECL(__name) __name

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#define DARSHAN_MPI_CALL(func) __real_ ## func

#define MAP_OR_FAIL(func) \
    if (!(__real_ ## func)) \
    { \
        __real_ ## func = dlsym(RTLD_NEXT, #func); \
        if(!(__real_ ## func)) { \
           fprintf(stderr, "Darshan failed to map symbol: %s\n", #func); \
           exit(1); \
       } \
    }


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extern double (*__real_PMPI_Wtime)(void);
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#else

#define DARSHAN_FORWARD_DECL(name,ret,args) \
  extern ret __real_ ## name args;

#define DARSHAN_DECL(__name) __wrap_ ## __name

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#define MAP_OR_FAIL(func)

#define DARSHAN_MPI_CALL(func) func

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#endif

DARSHAN_FORWARD_DECL(creat, int, (const char* path, mode_t mode));
DARSHAN_FORWARD_DECL(creat64, int, (const char* path, mode_t mode));
DARSHAN_FORWARD_DECL(open, int, (const char *path, int flags, ...));
DARSHAN_FORWARD_DECL(open64, int, (const char *path, int flags, ...));
DARSHAN_FORWARD_DECL(close, int, (int fd));
DARSHAN_FORWARD_DECL(write, ssize_t, (int fd, const void *buf, size_t count));
DARSHAN_FORWARD_DECL(read, ssize_t, (int fd, void *buf, size_t count));
DARSHAN_FORWARD_DECL(lseek, off_t, (int fd, off_t offset, int whence));
DARSHAN_FORWARD_DECL(lseek64, off64_t, (int fd, off64_t offset, int whence));
DARSHAN_FORWARD_DECL(pread, ssize_t, (int fd, void *buf, size_t count, off_t offset));
DARSHAN_FORWARD_DECL(pread64, ssize_t, (int fd, void *buf, size_t count, off64_t offset));
DARSHAN_FORWARD_DECL(pwrite, ssize_t, (int fd, const void *buf, size_t count, off_t offset));
DARSHAN_FORWARD_DECL(pwrite64, ssize_t, (int fd, const void *buf, size_t count, off64_t offset
));
DARSHAN_FORWARD_DECL(readv, ssize_t, (int fd, const struct iovec *iov, int iovcnt));
DARSHAN_FORWARD_DECL(writev, ssize_t, (int fd, const struct iovec *iov, int iovcnt));
DARSHAN_FORWARD_DECL(__fxstat, int, (int vers, int fd, struct stat *buf));
DARSHAN_FORWARD_DECL(__fxstat64, int, (int vers, int fd, struct stat64 *buf));
DARSHAN_FORWARD_DECL(__lxstat, int, (int vers, const char* path, struct stat *buf));
DARSHAN_FORWARD_DECL(__lxstat64, int, (int vers, const char* path, struct stat64 *buf));
DARSHAN_FORWARD_DECL(__xstat, int, (int vers, const char* path, struct stat *buf));
DARSHAN_FORWARD_DECL(__xstat64, int, (int vers, const char* path, struct stat64 *buf));
DARSHAN_FORWARD_DECL(mmap, void*, (void *addr, size_t length, int prot, int flags, int fd, off_t offset));
DARSHAN_FORWARD_DECL(mmap64, void*, (void *addr, size_t length, int prot, int flags, int fd, off64_t offset));
DARSHAN_FORWARD_DECL(fopen, FILE*, (const char *path, const char *mode));
DARSHAN_FORWARD_DECL(fopen64, FILE*, (const char *path, const char *mode));
DARSHAN_FORWARD_DECL(fclose, int, (FILE *fp));
DARSHAN_FORWARD_DECL(fread, size_t, (void *ptr, size_t size, size_t nmemb, FILE *stream));
DARSHAN_FORWARD_DECL(fwrite, size_t, (const void *ptr, size_t size, size_t nmemb, FILE *stream));
DARSHAN_FORWARD_DECL(fseek, int, (FILE *stream, long offset, int whence));
DARSHAN_FORWARD_DECL(fsync, int, (int fd));
DARSHAN_FORWARD_DECL(fdatasync, int, (int fd));

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pthread_mutex_t cp_mutex = PTHREAD_MUTEX_INITIALIZER;
struct darshan_job_runtime* darshan_global_job = NULL;
static int my_rank = -1;
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static struct stat64 cp_stat_buf;
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static int darshan_mem_alignment = 1;
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/* these are paths that we will not trace */
static char* exclusions[] = {
"/etc/",
"/dev/",
"/usr/",
"/bin/",
"/boot/",
"/lib/",
"/opt/",
"/sbin/",
"/sys/",
"/proc/",
NULL
};

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static double posix_wtime(void);

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static void cp_access_counter(struct darshan_file_runtime* file, ssize_t size,     enum cp_counter_type type);

#define CP_RECORD_WRITE(__ret, __fd, __count, __update_offset, __aligned, __stream_flag, __tm1, __tm2) do{ \
    size_t stride; \
    off_t old_offset; \
    int64_t file_alignment; \
    struct darshan_file_runtime* file; \
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    double __elapsed = __tm2-__tm1; \
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    if(__ret < 0) break; \
    file = darshan_file_by_fd(__fd); \
    if(!file) break; \
    old_offset = file->offset; \
    file_alignment = CP_VALUE(file, CP_FILE_ALIGNMENT); \
    if(old_offset > file->last_byte_written) \
        CP_INC(file, CP_SEQ_WRITES, 1); \
    if(old_offset == (file->last_byte_written + 1)) \
        CP_INC(file, CP_CONSEC_WRITES, 1); \
    if(old_offset > 0 && old_offset > file->last_byte_written \
        && file->last_byte_written != 0) \
        stride = old_offset - file->last_byte_written - 1; \
    else \
        stride = 0; \
    file->last_byte_written = old_offset + __ret - 1; \
    if(__update_offset) \
        file->offset = old_offset + __ret; \
    CP_MAX(file, CP_MAX_BYTE_WRITTEN, (old_offset + __ret -1)); \
    CP_INC(file, CP_BYTES_WRITTEN, __ret); \
    if(__stream_flag) \
        CP_INC(file, CP_POSIX_FWRITES, 1); \
    else \
        CP_INC(file, CP_POSIX_WRITES, 1); \
    CP_BUCKET_INC(file, CP_SIZE_WRITE_0_100, __ret); \
    cp_access_counter(file, stride, CP_COUNTER_STRIDE); \
    if(!__aligned) \
        CP_INC(file, CP_MEM_NOT_ALIGNED, 1); \
    if(file_alignment && (old_offset % file_alignment) != 0) \
        CP_INC(file, CP_FILE_NOT_ALIGNED, 1); \
    cp_access_counter(file, __ret, CP_COUNTER_ACCESS); \
    if(file->last_io_type == CP_READ) \
        CP_INC(file, CP_RW_SWITCHES, 1); \
    file->last_io_type = CP_WRITE; \
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    CP_F_INC(file, CP_F_POSIX_WRITE_TIME, (__elapsed)); \
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    if(CP_F_VALUE(file, CP_F_WRITE_START_TIMESTAMP) == 0) \
        CP_F_SET(file, CP_F_WRITE_START_TIMESTAMP, __tm1); \
    CP_F_SET(file, CP_F_WRITE_END_TIMESTAMP, __tm2); \
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    if(CP_F_VALUE(file, CP_F_MAX_WRITE_TIME) < __elapsed){ \
        CP_F_SET(file, CP_F_MAX_WRITE_TIME, __elapsed); \
        CP_SET(file, CP_MAX_WRITE_TIME_SIZE, __ret); } \
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} while(0)

#define CP_RECORD_READ(__ret, __fd, __count, __update_offset, __aligned, __stream_flag, __tm1, __tm2) do{ \
    size_t stride; \
    off_t old_offset; \
    struct darshan_file_runtime* file; \
    int64_t file_alignment; \
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    double __elapsed = __tm2-__tm1; \
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    if(__ret < 0) break; \
    file = darshan_file_by_fd(__fd); \
    if(!file) break; \
    old_offset = file->offset; \
    file_alignment = CP_VALUE(file, CP_FILE_ALIGNMENT); \
    if(old_offset > file->last_byte_read) \
        CP_INC(file, CP_SEQ_READS, 1); \
    if(old_offset == (file->last_byte_read + 1)) \
        CP_INC(file, CP_CONSEC_READS, 1); \
    if(old_offset > 0 && old_offset > file->last_byte_read \
        && file->last_byte_read != 0) \
        stride = old_offset - file->last_byte_read - 1; \
    else \
        stride = 0; \
    file->last_byte_read = old_offset + __ret - 1; \
    CP_MAX(file, CP_MAX_BYTE_READ, (old_offset + __ret -1)); \
    if(__update_offset) \
        file->offset = old_offset + __ret; \
    CP_INC(file, CP_BYTES_READ, __ret); \
    if(__stream_flag)\
        CP_INC(file, CP_POSIX_FREADS, 1); \
    else\
        CP_INC(file, CP_POSIX_READS, 1); \
    CP_BUCKET_INC(file, CP_SIZE_READ_0_100, __ret); \
    cp_access_counter(file, stride, CP_COUNTER_STRIDE); \
    if(!__aligned) \
        CP_INC(file, CP_MEM_NOT_ALIGNED, 1); \
    if(file_alignment && (old_offset % file_alignment) != 0) \
        CP_INC(file, CP_FILE_NOT_ALIGNED, 1); \
    cp_access_counter(file, __ret, CP_COUNTER_ACCESS); \
    if(file->last_io_type == CP_WRITE) \
        CP_INC(file, CP_RW_SWITCHES, 1); \
    file->last_io_type = CP_READ; \
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    CP_F_INC(file, CP_F_POSIX_READ_TIME, (__elapsed)); \
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    if(CP_F_VALUE(file, CP_F_READ_START_TIMESTAMP) == 0) \
        CP_F_SET(file, CP_F_READ_START_TIMESTAMP, __tm1); \
    CP_F_SET(file, CP_F_READ_END_TIMESTAMP, __tm2); \
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    if(CP_F_VALUE(file, CP_F_MAX_READ_TIME) < __elapsed){ \
        CP_F_SET(file, CP_F_MAX_READ_TIME, __elapsed); \
        CP_SET(file, CP_MAX_READ_TIME_SIZE, __ret); } \
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} while(0)

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#define CP_RECORD_STAT(__file, __statbuf, __tm1, __tm2) do { \
    if(!CP_VALUE((__file), CP_FILE_ALIGNMENT)){ \
        CP_SET((__file), CP_DEVICE, (__statbuf)->st_dev); \
        CP_SET((__file), CP_FILE_ALIGNMENT, (__statbuf)->st_blksize); \
        CP_SET((__file), CP_SIZE_AT_OPEN, (__statbuf)->st_size); \
    }\
    (__file)->log_file->rank = my_rank; \
    CP_F_INC(__file, CP_F_POSIX_META_TIME, (__tm2-__tm1)); \
    CP_INC(__file, CP_POSIX_STATS, 1); \
} while(0)

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#define CP_RECORD_OPEN(__ret, __path, __mode, __stream_flag, __tm1, __tm2) do { \
    struct darshan_file_runtime* file; \
    char* exclude; \
    int tmp_index = 0; \
    int hash_index; \
    if(__ret < 0) break; \
    while((exclude = exclusions[tmp_index])) { \
        if(!(strncmp(exclude, __path, strlen(exclude)))) \
            break; \
        tmp_index++; \
    } \
    if(exclude) break; \
    file = darshan_file_by_name(__path); \
    if(!file) break; \
    if(file->fd != -1) break; /* TODO: handle multiple concurrent opens */ \
    file->fd = __ret; \
    if(!CP_VALUE(file, CP_FILE_ALIGNMENT)){ \
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        if(fstat64(file->fd, &cp_stat_buf) == 0) {\
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            CP_SET(file, CP_DEVICE, cp_stat_buf.st_dev); \
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            CP_SET(file, CP_FILE_ALIGNMENT, cp_stat_buf.st_blksize); \
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            CP_SET(file, CP_SIZE_AT_OPEN, cp_stat_buf.st_size); \
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        }\
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    }\
    file->log_file->rank = my_rank; \
    if(__mode) \
        CP_SET(file, CP_MODE, __mode); \
    file->offset = 0; \
    file->last_byte_written = 0; \
    file->last_byte_read = 0; \
    if(__stream_flag)\
        CP_INC(file, CP_POSIX_FOPENS, 1); \
    else \
        CP_INC(file, CP_POSIX_OPENS, 1); \
    if(CP_F_VALUE(file, CP_F_OPEN_TIMESTAMP) == 0) \
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        CP_F_SET(file, CP_F_OPEN_TIMESTAMP, posix_wtime()); \
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    CP_F_INC(file, CP_F_POSIX_META_TIME, (__tm2-__tm1)); \
    hash_index = file->fd & CP_HASH_MASK; \
    file->fd_prev = NULL; \
    file->fd_next = darshan_global_job->fd_table[hash_index]; \
    if(file->fd_next) \
        file->fd_next->fd_prev = file; \
    darshan_global_job->fd_table[hash_index] = file; \
} while (0)

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int DARSHAN_DECL(close)(int fd)
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{
    struct darshan_file_runtime* file;
    int hash_index;
    int tmp_fd = fd;
    double tm1, tm2;
    int ret;

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    MAP_OR_FAIL(close);

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    tm1 = darshan_wtime();
    ret = __real_close(fd);
    tm2 = darshan_wtime();

    CP_LOCK();
    file = darshan_file_by_fd(tmp_fd);
    if(file)
    {
        file->fd = -1;
        file->last_byte_written = 0;
        file->last_byte_read = 0;
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        CP_F_SET(file, CP_F_CLOSE_TIMESTAMP, posix_wtime());
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        CP_F_INC(file, CP_F_POSIX_META_TIME, (tm2-tm1));
        if(file->fd_prev == NULL)
        {
            /* head of fd hash table list */
            hash_index = tmp_fd & CP_HASH_MASK;
            darshan_global_job->fd_table[hash_index] = file->fd_next;
            if(file->fd_next)
                file->fd_next->fd_prev = NULL;
        }
        else
        {
            if(file->fd_prev)
                file->fd_prev->fd_next = file->fd_next;
            if(file->fd_next)
                file->fd_next->fd_prev = file->fd_prev;
        }
        file->fd_prev = NULL;
        file->fd_next = NULL;
        darshan_global_job->darshan_mru_file = file; /* in case we open it again */
    }
    CP_UNLOCK();

    return(ret);
}

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int DARSHAN_DECL(fclose)(FILE *fp)
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{
    struct darshan_file_runtime* file;
    int hash_index;
    int tmp_fd = fileno(fp);
    double tm1, tm2;
    int ret;

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    MAP_OR_FAIL(fclose);

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    tm1 = darshan_wtime();
    ret = __real_fclose(fp);
    tm2 = darshan_wtime();
    
    CP_LOCK();
    file = darshan_file_by_fd(tmp_fd);
    if(file)
    {
        file->fd = -1;
        file->last_byte_written = 0;
        file->last_byte_read = 0;
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        CP_F_SET(file, CP_F_CLOSE_TIMESTAMP, posix_wtime());
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        CP_F_INC(file, CP_F_POSIX_META_TIME, (tm2-tm1));
        if(file->fd_prev == NULL)
        {
            /* head of fd hash table list */
            hash_index = tmp_fd & CP_HASH_MASK;
            darshan_global_job->fd_table[hash_index] = file->fd_next;
            if(file->fd_next)
                file->fd_next->fd_prev = NULL;
        }
        else
        {
            if(file->fd_prev)
                file->fd_prev->fd_next = file->fd_next;
            if(file->fd_next)
                file->fd_next->fd_prev = file->fd_prev;
        }
        file->fd_prev = NULL;
        file->fd_next = NULL;
        darshan_global_job->darshan_mru_file = file; /* in case we open it again */
    }
    CP_UNLOCK();

    return(ret);
}


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int DARSHAN_DECL(fsync)(int fd)
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{
    int ret;
    struct darshan_file_runtime* file;
    double tm1, tm2;

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    MAP_OR_FAIL(fsync);

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    tm1 = darshan_wtime();
    ret = __real_fsync(fd);
    tm2 = darshan_wtime();

    if(ret < 0)
        return(ret);

    CP_LOCK();
    file = darshan_file_by_fd(fd);
    if(file)
    {
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        CP_F_INC(file, CP_F_POSIX_WRITE_TIME, (tm2-tm1));
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        CP_INC(file, CP_POSIX_FSYNCS, 1);
    }
    CP_UNLOCK();

    return(ret);
}

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int DARSHAN_DECL(fdatasync)(int fd)
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{
    int ret;
    struct darshan_file_runtime* file;
    double tm1, tm2;

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    MAP_OR_FAIL(fdatasync);

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    tm1 = darshan_wtime();
    ret = __real_fdatasync(fd);
    tm2 = darshan_wtime();
    if(ret < 0)
        return(ret);

    CP_LOCK();
    file = darshan_file_by_fd(fd);
    if(file)
    {
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        CP_F_INC(file, CP_F_POSIX_WRITE_TIME, (tm2-tm1));
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        CP_INC(file, CP_POSIX_FDSYNCS, 1);
    }
    CP_UNLOCK();

    return(ret);
}


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void* DARSHAN_DECL(mmap64)(void *addr, size_t length, int prot, int flags,
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    int fd, off64_t offset)
{
    void* ret;
    struct darshan_file_runtime* file;

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    MAP_OR_FAIL(mmap64);

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    ret = __real_mmap64(addr, length, prot, flags, fd, offset);
    if(ret == MAP_FAILED)
        return(ret);

    CP_LOCK();
    file = darshan_file_by_fd(fd);
    if(file)
    {
        CP_INC(file, CP_POSIX_MMAPS, 1);
    }
    CP_UNLOCK();

    return(ret);
}


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void* DARSHAN_DECL(mmap)(void *addr, size_t length, int prot, int flags,
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    int fd, off_t offset)
{
    void* ret;
    struct darshan_file_runtime* file;

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    MAP_OR_FAIL(mmap);

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    ret = __real_mmap(addr, length, prot, flags, fd, offset);
    if(ret == MAP_FAILED)
        return(ret);

    CP_LOCK();
    file = darshan_file_by_fd(fd);
    if(file)
    {
        CP_INC(file, CP_POSIX_MMAPS, 1);
    }
    CP_UNLOCK();

    return(ret);
}

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int DARSHAN_DECL(creat)(const char* path, mode_t mode)
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{
    int ret;
    double tm1, tm2;

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    MAP_OR_FAIL(creat);

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    tm1 = darshan_wtime();
    ret = __real_creat(path, mode);
    tm2 = darshan_wtime();

    CP_LOCK();
    CP_RECORD_OPEN(ret, path, mode, 0, tm1, tm2);
    CP_UNLOCK();

    return(ret);
}

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int DARSHAN_DECL(creat64)(const char* path, mode_t mode)
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{
    int ret;
    double tm1, tm2;

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    MAP_OR_FAIL(creat64);

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    tm1 = darshan_wtime();
    ret = __real_creat64(path, mode);
    tm2 = darshan_wtime();

    CP_LOCK();
    CP_RECORD_OPEN(ret, path, mode, 0, tm1, tm2);
    CP_UNLOCK();

    return(ret);
}

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int DARSHAN_DECL(open64)(const char* path, int flags, ...)
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{
    int mode = 0;
    int ret;
    double tm1, tm2;

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    MAP_OR_FAIL(open64);

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    if (flags & O_CREAT) 
    {
        va_list arg;
        va_start(arg, flags);
        mode = va_arg(arg, int);
        va_end(arg);

        tm1 = darshan_wtime();
        ret = __real_open64(path, flags, mode);
        tm2 = darshan_wtime();
    }
    else
    {
        tm1 = darshan_wtime();
        ret = __real_open64(path, flags);
        tm2 = darshan_wtime();
    }

    CP_LOCK();
    CP_RECORD_OPEN(ret, path, mode, 0, tm1, tm2);
    CP_UNLOCK();

    return(ret);
}

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int DARSHAN_DECL(open)(const char *path, int flags, ...)
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{
    int mode = 0;
    int ret;
    double tm1, tm2;

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    MAP_OR_FAIL(open);

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    if (flags & O_CREAT) 
    {
        va_list arg;
        va_start(arg, flags);
        mode = va_arg(arg, int);
        va_end(arg);

        tm1 = darshan_wtime();
        ret = __real_open(path, flags, mode);
        tm2 = darshan_wtime();
    }
    else
    {
        tm1 = darshan_wtime();
        ret = __real_open(path, flags);
        tm2 = darshan_wtime();
    }

    CP_LOCK();
    CP_RECORD_OPEN(ret, path, mode, 0, tm1, tm2);
    CP_UNLOCK();

    return(ret);
}

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FILE* DARSHAN_DECL(fopen64)(const char *path, const char *mode)
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{
    FILE* ret;
    int fd;
    double tm1, tm2;

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    MAP_OR_FAIL(fopen64);

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    tm1 = darshan_wtime();
    ret = __real_fopen64(path, mode);
    tm2 = darshan_wtime();
    if(ret == 0)
        fd = -1;
    else
        fd = fileno(ret);

    CP_LOCK();
    CP_RECORD_OPEN(fd, path, 0, 1, tm1, tm2);
    CP_UNLOCK();

    return(ret);
}

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FILE* DARSHAN_DECL(fopen)(const char *path, const char *mode)
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{
    FILE* ret;
    int fd;
    double tm1, tm2;

605 606
    MAP_OR_FAIL(fopen);

607 608 609 610 611 612 613 614 615 616 617 618 619 620 621
    tm1 = darshan_wtime();
    ret = __real_fopen(path, mode);
    tm2 = darshan_wtime();
    if(ret == 0)
        fd = -1;
    else
        fd = fileno(ret);

    CP_LOCK();
    CP_RECORD_OPEN(fd, path, 0, 1, tm1, tm2);
    CP_UNLOCK();

    return(ret);
}

622
int DARSHAN_DECL(__xstat64)(int vers, const char *path, struct stat64 *buf)
623 624 625 626 627
{
    int ret;
    struct darshan_file_runtime* file;
    double tm1, tm2;

628 629
    MAP_OR_FAIL(__xstat64);

630 631 632 633 634 635 636 637 638 639
    tm1 = darshan_wtime();
    ret = __real___xstat64(vers, path, buf);
    tm2 = darshan_wtime();
    if(ret < 0 || !S_ISREG(buf->st_mode))
        return(ret);

    CP_LOCK();
    file = darshan_file_by_name(path);
    if(file)
    {
640
        CP_RECORD_STAT(file, buf, tm1, tm2);
641 642 643 644 645 646
    }
    CP_UNLOCK();

    return(ret);
}

647
int DARSHAN_DECL(__lxstat64)(int vers, const char *path, struct stat64 *buf)
648 649 650 651 652
{
    int ret;
    struct darshan_file_runtime* file;
    double tm1, tm2;

653 654
    MAP_OR_FAIL(__lxstat64);

655 656 657 658 659 660 661 662 663 664
    tm1 = darshan_wtime();
    ret = __real___lxstat64(vers, path, buf);
    tm2 = darshan_wtime();
    if(ret < 0 || !S_ISREG(buf->st_mode))
        return(ret);

    CP_LOCK();
    file = darshan_file_by_name(path);
    if(file)
    {
665
        CP_RECORD_STAT(file, buf, tm1, tm2);
666 667 668 669 670 671
    }
    CP_UNLOCK();

    return(ret);
}

672
int DARSHAN_DECL(__fxstat64)(int vers, int fd, struct stat64 *buf)
673 674 675 676 677
{
    int ret;
    struct darshan_file_runtime* file;
    double tm1, tm2;

678 679
    MAP_OR_FAIL(__fxstat64);

680 681 682 683 684 685 686 687 688 689 690 691 692 693
    tm1 = darshan_wtime();
    ret = __real___fxstat64(vers, fd, buf);
    tm2 = darshan_wtime();
    if(ret < 0 || !S_ISREG(buf->st_mode))
        return(ret);

    /* skip logging if this was triggered internally */
    if(buf == &cp_stat_buf)
        return(ret);

    CP_LOCK();
    file = darshan_file_by_fd(fd);
    if(file)
    {
694
        CP_RECORD_STAT(file, buf, tm1, tm2);
695 696 697 698 699 700 701
    }
    CP_UNLOCK();

    return(ret);
}


702
int DARSHAN_DECL(__xstat)(int vers, const char *path, struct stat *buf)
703 704 705 706 707
{
    int ret;
    struct darshan_file_runtime* file;
    double tm1, tm2;

708 709
    MAP_OR_FAIL(__xstat);

710 711 712 713 714 715 716 717 718 719
    tm1 = darshan_wtime();
    ret = __real___xstat(vers, path, buf);
    tm2 = darshan_wtime();
    if(ret < 0 || !S_ISREG(buf->st_mode))
        return(ret);

    CP_LOCK();
    file = darshan_file_by_name(path);
    if(file)
    {
720
        CP_RECORD_STAT(file, buf, tm1, tm2);
721 722 723 724 725 726
    }
    CP_UNLOCK();

    return(ret);
}

727
int DARSHAN_DECL(__lxstat)(int vers, const char *path, struct stat *buf)
728 729 730 731 732
{
    int ret;
    struct darshan_file_runtime* file;
    double tm1, tm2;

733 734
    MAP_OR_FAIL(__lxstat);

735 736 737 738 739 740 741 742 743 744
    tm1 = darshan_wtime();
    ret = __real___lxstat(vers, path, buf);
    tm2 = darshan_wtime();
    if(ret < 0 || !S_ISREG(buf->st_mode))
        return(ret);

    CP_LOCK();
    file = darshan_file_by_name(path);
    if(file)
    {
745
        CP_RECORD_STAT(file, buf, tm1, tm2);
746 747 748 749 750 751
    }
    CP_UNLOCK();

    return(ret);
}

752
int DARSHAN_DECL(__fxstat)(int vers, int fd, struct stat *buf)
753 754 755 756 757
{
    int ret;
    struct darshan_file_runtime* file;
    double tm1, tm2;

758 759
    MAP_OR_FAIL(__fxstat);

760 761 762 763 764 765 766
    tm1 = darshan_wtime();
    ret = __real___fxstat(vers, fd, buf);
    tm2 = darshan_wtime();
    if(ret < 0 || !S_ISREG(buf->st_mode))
        return(ret);

    /* skip logging if this was triggered internally */
767
    if((void*)buf == (void*)&cp_stat_buf)
768 769 770 771 772 773
        return(ret);

    CP_LOCK();
    file = darshan_file_by_fd(fd);
    if(file)
    {
774
        CP_RECORD_STAT(file, buf, tm1, tm2);
775 776 777 778 779 780
    }
    CP_UNLOCK();

    return(ret);
}

781
ssize_t DARSHAN_DECL(pread64)(int fd, void *buf, size_t count, off64_t offset)
782 783 784 785 786
{
    ssize_t ret;
    int aligned_flag = 0;
    double tm1, tm2;

787 788
    MAP_OR_FAIL(pread64);

789
    if((unsigned long)buf % darshan_mem_alignment == 0)
790 791 792 793 794 795 796 797 798 799 800
        aligned_flag = 1;

    tm1 = darshan_wtime();
    ret = __real_pread64(fd, buf, count, offset);
    tm2 = darshan_wtime();
    CP_LOCK();
    CP_RECORD_READ(ret, fd, count, 0, aligned_flag, 0, tm1, tm2);
    CP_UNLOCK();
    return(ret);
}

801
ssize_t DARSHAN_DECL(pread)(int fd, void *buf, size_t count, off_t offset)
802 803 804 805 806
{
    ssize_t ret;
    int aligned_flag = 0;
    double tm1, tm2;

807 808
    MAP_OR_FAIL(pread);

809
    if((unsigned long)buf % darshan_mem_alignment == 0)
810 811 812 813 814 815 816 817 818 819 820 821
        aligned_flag = 1;

    tm1 = darshan_wtime();
    ret = __real_pread(fd, buf, count, offset);
    tm2 = darshan_wtime();
    CP_LOCK();
    CP_RECORD_READ(ret, fd, count, 0, aligned_flag, 0, tm1, tm2);
    CP_UNLOCK();
    return(ret);
}


822
ssize_t DARSHAN_DECL(pwrite)(int fd, const void *buf, size_t count, off_t offset)
823 824 825 826 827
{
    ssize_t ret;
    int aligned_flag = 0;
    double tm1, tm2;

828 829
    MAP_OR_FAIL(pwrite);

830
    if((unsigned long)buf % darshan_mem_alignment == 0)
831 832 833 834 835 836 837 838 839 840 841
        aligned_flag = 1;

    tm1 = darshan_wtime();
    ret = __real_pwrite(fd, buf, count, offset);
    tm2 = darshan_wtime();
    CP_LOCK();
    CP_RECORD_WRITE(ret, fd, count, 0, aligned_flag, 0, tm1, tm2);
    CP_UNLOCK();
    return(ret);
}

842
ssize_t DARSHAN_DECL(pwrite64)(int fd, const void *buf, size_t count, off64_t offset)
843 844 845 846 847
{
    ssize_t ret;
    int aligned_flag = 0;
    double tm1, tm2;

848 849
    MAP_OR_FAIL(pwrite64);

850
    if((unsigned long)buf % darshan_mem_alignment == 0)
851 852 853 854 855 856 857 858 859 860 861
        aligned_flag = 1;

    tm1 = darshan_wtime();
    ret = __real_pwrite64(fd, buf, count, offset);
    tm2 = darshan_wtime();
    CP_LOCK();
    CP_RECORD_WRITE(ret, fd, count, 0, aligned_flag, 0, tm1, tm2);
    CP_UNLOCK();
    return(ret);
}

862
ssize_t DARSHAN_DECL(readv)(int fd, const struct iovec *iov, int iovcnt)
863 864 865 866 867 868
{
    ssize_t ret;
    int aligned_flag = 1;
    int i;
    double tm1, tm2;

869 870
    MAP_OR_FAIL(readv);

871 872
    for(i=0; i<iovcnt; i++)
    {
873
        if(((unsigned long)iov[i].iov_base % darshan_mem_alignment) != 0)
874 875 876 877 878 879 880 881 882 883 884 885
            aligned_flag = 0;
    }

    tm1 = darshan_wtime();
    ret = __real_readv(fd, iov, iovcnt);
    tm2 = darshan_wtime();
    CP_LOCK();
    CP_RECORD_READ(ret, fd, count, 1, aligned_flag, 0, tm1, tm2);
    CP_UNLOCK();
    return(ret);
}

886
ssize_t DARSHAN_DECL(writev)(int fd, const struct iovec *iov, int iovcnt)
887 888 889 890 891 892
{
    ssize_t ret;
    int aligned_flag = 1;
    int i;
    double tm1, tm2;

893 894
    MAP_OR_FAIL(writev);

895 896
    for(i=0; i<iovcnt; i++)
    {
897
        if(!((unsigned long)iov[i].iov_base % darshan_mem_alignment == 0))
898 899 900 901 902 903 904 905 906 907 908 909
            aligned_flag = 0;
    }

    tm1 = darshan_wtime();
    ret = __real_writev(fd, iov, iovcnt);
    tm2 = darshan_wtime();
    CP_LOCK();
    CP_RECORD_WRITE(ret, fd, count, 1, aligned_flag, 0, tm1, tm2);
    CP_UNLOCK();
    return(ret);
}

910
size_t DARSHAN_DECL(fread)(void *ptr, size_t size, size_t nmemb, FILE *stream)
911 912 913 914 915
{
    size_t ret;
    int aligned_flag = 0;
    double tm1, tm2;

916 917
    MAP_OR_FAIL(fread);

918
    if((unsigned long)ptr % darshan_mem_alignment == 0)
919 920 921 922 923 924 925 926 927 928 929 930 931 932
        aligned_flag = 1;

    tm1 = darshan_wtime();
    ret = __real_fread(ptr, size, nmemb, stream);
    tm2 = darshan_wtime();
    CP_LOCK();
    if(ret > 0)
        CP_RECORD_READ(size*ret, fileno(stream), (size*nmemb), 1, aligned_flag, 1, tm1, tm2);
    else
        CP_RECORD_READ(ret, fileno(stream), (size*nmemb), 1, aligned_flag, 1, tm1, tm2);
    CP_UNLOCK();
    return(ret);
}

933
ssize_t DARSHAN_DECL(read)(int fd, void *buf, size_t count)
934 935 936 937 938
{
    ssize_t ret;
    int aligned_flag = 0;
    double tm1, tm2;

939 940
    MAP_OR_FAIL(read);

941
    if((unsigned long)buf % darshan_mem_alignment == 0)
942 943 944 945 946 947 948 949 950 951 952
        aligned_flag = 1;

    tm1 = darshan_wtime();
    ret = __real_read(fd, buf, count);
    tm2 = darshan_wtime();
    CP_LOCK();
    CP_RECORD_READ(ret, fd, count, 1, aligned_flag, 0, tm1, tm2);
    CP_UNLOCK();
    return(ret);
}

953
ssize_t DARSHAN_DECL(write)(int fd, const void *buf, size_t count)
954 955 956 957 958
{
    ssize_t ret;
    int aligned_flag = 0;
    double tm1, tm2;

959 960
    MAP_OR_FAIL(write);

961
    if((unsigned long)buf % darshan_mem_alignment == 0)
962 963 964 965 966 967 968 969 970 971 972
        aligned_flag = 1;

    tm1 = darshan_wtime();
    ret = __real_write(fd, buf, count);
    tm2 = darshan_wtime();
    CP_LOCK();
    CP_RECORD_WRITE(ret, fd, count, 1, aligned_flag, 0, tm1, tm2);
    CP_UNLOCK();
    return(ret);
}

973
size_t DARSHAN_DECL(fwrite)(const void *ptr, size_t size, size_t nmemb, FILE *stream)
974 975 976 977 978
{
    size_t ret;
    int aligned_flag = 0;
    double tm1, tm2;

979 980
    MAP_OR_FAIL(fwrite);

981
    if((unsigned long)ptr % darshan_mem_alignment == 0)
982 983 984 985 986 987 988 989 990 991 992 993 994 995
        aligned_flag = 1;

    tm1 = darshan_wtime();
    ret = __real_fwrite(ptr, size, nmemb, stream);
    tm2 = darshan_wtime();
    CP_LOCK();
    if(ret > 0)
        CP_RECORD_WRITE(size*ret, fileno(stream), (size*nmemb), 1, aligned_flag, 1, tm1, tm2);
    else
        CP_RECORD_WRITE(ret, fileno(stream), 0, 1, aligned_flag, 1, tm1, tm2);
    CP_UNLOCK();
    return(ret);
}

996
off64_t DARSHAN_DECL(lseek64)(int fd, off64_t offset, int whence)
997
{
998
    off64_t ret;
999 1000 1001
    struct darshan_file_runtime* file;
    double tm1, tm2;

1002 1003
    MAP_OR_FAIL(lseek64);

1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021
    tm1 = darshan_wtime();
    ret = __real_lseek64(fd, offset, whence);
    tm2 = darshan_wtime();
    if(ret >= 0)
    {
        CP_LOCK();
        file = darshan_file_by_fd(fd);
        if(file)
        {
            file->offset = ret;
            CP_F_INC(file, CP_F_POSIX_META_TIME, (tm2-tm1));
            CP_INC(file, CP_POSIX_SEEKS, 1);
        }
        CP_UNLOCK();
    }
    return(ret);
}

1022
off_t DARSHAN_DECL(lseek)(int fd, off_t offset, int whence)
1023 1024 1025 1026 1027
{
    off_t ret;
    struct darshan_file_runtime* file;
    double tm1, tm2;

1028 1029
    MAP_OR_FAIL(lseek);

1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047
    tm1 = darshan_wtime();
    ret = __real_lseek(fd, offset, whence);
    tm2 = darshan_wtime();
    if(ret >= 0)
    {
        CP_LOCK();
        file = darshan_file_by_fd(fd);
        if(file)
        {
            file->offset = ret;
            CP_F_INC(file, CP_F_POSIX_META_TIME, (tm2-tm1));
            CP_INC(file, CP_POSIX_SEEKS, 1);
        }
        CP_UNLOCK();
    }
    return(ret);
}

1048
int DARSHAN_DECL(fseek)(FILE *stream, long offset, int whence)
1049 1050 1051 1052 1053
{
    int ret;
    struct darshan_file_runtime* file;
    double tm1, tm2;

1054 1055
    MAP_OR_FAIL(fseek);

1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088
    tm1 = darshan_wtime();
    ret = __real_fseek(stream, offset, whence);
    tm2 = darshan_wtime();
    if(ret >= 0)
    {
        CP_LOCK();
        file = darshan_file_by_fd(fileno(stream));
        if(file)
        {
            file->offset = ret;
            CP_F_INC(file, CP_F_POSIX_META_TIME, (tm2-tm1));
            CP_INC(file, CP_POSIX_FSEEKS, 1);
        }
        CP_UNLOCK();
    }
    return(ret);
}

void darshan_finalize(struct darshan_job_runtime* job)
{
    if(!job)
    {
        return;
    }

    free(job);
}

void darshan_initialize(int argc, char** argv,  int nprocs, int rank)
{
    int i;
    char* disable;
    char* disable_timing;
1089
    char* envstr;
1090 1091 1092
    char* truncate_string = "<TRUNCATED>";
    int truncate_offset;
    int chars_left = 0;
1093 1094
    int ret;
    int tmpval;
1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109

    disable = getenv("DARSHAN_DISABLE");
    if(disable)
    {
        /* turn off tracing */
        return;
    }

    disable_timing = getenv("DARSHAN_DISABLE_TIMING");

    if(darshan_global_job != NULL)
    {
        return;
    }

1110 1111 1112
    #if (__CP_MEM_ALIGNMENT < 1)
        #error Darshan must be configured with a positive value for --with-mem-align
    #endif
1113 1114 1115
    envstr = getenv("DARSHAN_MEMALIGN");
    if (envstr)
    {
1116 1117 1118 1119 1120 1121
        ret = sscanf(envstr, "%d", &tmpval);
        /* silently ignore if the env variable is set poorly */
        if(ret == 1 && tmpval > 0)
        {
            darshan_mem_alignment = tmpval;
        }
1122 1123 1124 1125 1126 1127
    }
    else
    {
        darshan_mem_alignment = __CP_MEM_ALIGNMENT;
    }

1128 1129 1130 1131 1132 1133
    /* avoid floating point errors on faulty input */
    if (darshan_mem_alignment < 1)
    {
        darshan_mem_alignment = 1;
    }

1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152
    /* allocate structure to track darshan_global_job information */
    darshan_global_job = malloc(sizeof(*darshan_global_job));
    if(!darshan_global_job)
    {
        return;
    }
    memset(darshan_global_job, 0, sizeof(*darshan_global_job));

    if(disable_timing)
    {
        darshan_global_job->flags |= CP_FLAG_NOTIMING;
    }

    /* set up file records */
    for(i=0; i<CP_MAX_FILES; i++)
    {
        darshan_global_job->file_runtime_array[i].log_file = 
            &darshan_global_job->file_array[i];
        darshan_global_job->file_runtime_array[i].fd = -1;
1153
        darshan_global_job->file_runtime_array[i].ncid = -1;
1154
        darshan_global_job->file_runtime_array[i].hid = -1;
1155 1156 1157 1158
        darshan_global_job->file_runtime_array[i].fh = MPI_FILE_NULL;
    }

    strcpy(darshan_global_job->log_job.version_string, CP_VERSION);
1159
    darshan_global_job->log_job.magic_nr = CP_MAGIC_NR;
1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234
    darshan_global_job->log_job.uid = getuid();
    darshan_global_job->log_job.start_time = time(NULL);
    darshan_global_job->log_job.nprocs = nprocs;
    my_rank = rank;

    /* record exe and arguments */
    for(i=0; i<argc; i++)
    {
        chars_left = CP_EXE_LEN-strlen(darshan_global_job->exe);
        strncat(darshan_global_job->exe, argv[i], chars_left);
        if(i < (argc-1))
        {
            chars_left = CP_EXE_LEN-strlen(darshan_global_job->exe);
            strncat(darshan_global_job->exe, " ", chars_left);
        }
    }

    /* if we don't see any arguments, then use glibc symbol to get
     * program name at least (this happens in fortran)
     */
    if(argc == 0)
    {
        chars_left = CP_EXE_LEN-strlen(darshan_global_job->exe);
        strncat(darshan_global_job->exe, __progname_full, chars_left);
        chars_left = CP_EXE_LEN-strlen(darshan_global_job->exe);
        strncat(darshan_global_job->exe, " <unknown args>", chars_left);
    }

    if(chars_left == 0)
    {
        /* we ran out of room; mark that string was truncated */
        truncate_offset = CP_EXE_LEN - strlen(truncate_string);
        sprintf(&darshan_global_job->exe[truncate_offset], "%s", 
            truncate_string);
    }
}

/* darshan_condense()
 *
 * collapses all file statistics into a single unified set of counters; used
 * when we have opened too many files to track independently
 */
void darshan_condense(void)
{
    struct darshan_file_runtime* base_file;
    struct darshan_file_runtime* iter_file;
    int i;
    int j;

    if(!darshan_global_job)
        return;

    base_file = &darshan_global_job->file_runtime_array[0];

    /* iterate through files */
    for(j=1; j<darshan_global_job->file_count; j++)
    {
        iter_file = &darshan_global_job->file_runtime_array[j];

        /* iterate through records */
        for(i=0; i<CP_NUM_INDICES; i++)
        {
            switch(i)
            {
                /* NOTE: several fields cease to make sense if the records
                 * have been condensed.  Just let them get summed anyway.
                 */
                /* TODO: double check this */

                /* keep up with global maxes in case they are helpful */
                case CP_MAX_BYTE_READ:
                case CP_MAX_BYTE_WRITTEN:
                    CP_MAX(base_file, i, CP_VALUE(iter_file, i));
                    break;

1235 1236 1237 1238 1239 1240 1241
                /* do nothing with these; they are handled in the floating
                 * point loop 
                 */
                case CP_MAX_WRITE_TIME_SIZE:
                case CP_MAX_READ_TIME_SIZE:
                    break;

1242 1243
                /* pick one */
                case CP_DEVICE:
1244
                case CP_SIZE_AT_OPEN:
1245 1246 1247
                    CP_SET(base_file, i, CP_VALUE(iter_file, i));
                    break;

1248 1249 1250 1251 1252 1253 1254 1255
                /* most records can simply be added */
                default:
                    CP_INC(base_file, i, CP_VALUE(iter_file, i));
                    break;
            }
        }
        for(i=0; i<CP_F_NUM_INDICES; i++)
        {
1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277
            switch(i)
            {
                case CP_F_MAX_WRITE_TIME:
                    if(CP_F_VALUE(iter_file, i) > CP_F_VALUE(base_file, i))
                    {
                        CP_F_SET(base_file, i, CP_F_VALUE(iter_file, i));
                        CP_SET(base_file, CP_MAX_WRITE_TIME_SIZE, 
                            CP_VALUE(iter_file, CP_MAX_WRITE_TIME_SIZE));
                    }
                    break;
                case CP_F_MAX_READ_TIME:
                    if(CP_F_VALUE(iter_file, i) > CP_F_VALUE(base_file, i))
                    {
                        CP_F_SET(base_file, i, CP_F_VALUE(iter_file, i));
                        CP_SET(base_file, CP_MAX_READ_TIME_SIZE, 
                            CP_VALUE(iter_file, CP_MAX_READ_TIME_SIZE));
                    }
                    break;
                default:
                    CP_F_SET(base_file, i, CP_F_VALUE(iter_file, i) + CP_F_VALUE(base_file, i));
                    break;
            }
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        }
    }
    
    base_file->log_file->hash = 0;
    
    darshan_global_job->flags |= CP_FLAG_CONDENSED;
    darshan_global_job->file_count = 1;

    /* clear hash tables for safety */
    memset(darshan_global_job->name_table, 0, CP_HASH_SIZE*sizeof(struct darshan_file_runtime*));
    memset(darshan_global_job->fd_table, 0, CP_HASH_SIZE*sizeof(struct darshan_file_runtime*));
    memset(darshan_global_job->fh_table, 0, CP_HASH_SIZE*sizeof(struct darshan_file_runtime*));
    
    return;
}

struct darshan_file_runtime* darshan_file_by_name(const char* name)
{
    struct darshan_file_runtime* tmp_file;
    uint64_t tmp_hash = 0;
    char* suffix_pointer;
    int hash_index;

    if(!darshan_global_job)
        return(NULL);

    /* if we have already condensed the data, then just hand the first file
     * back
     */
    if(darshan_global_job->flags & CP_FLAG_CONDENSED)
    {
        return(&darshan_global_job->file_runtime_array[0]);
    }

1312
    tmp_hash = darshan_hash((void*)name, strlen(name), 0);
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    /* check most recently used */
    if(darshan_global_job->darshan_mru_file && darshan_global_job->darshan_mru_file->log_file->hash == tmp_hash)
    {
        return(darshan_global_job->darshan_mru_file);
    }

    /* search hash table */
    hash_index = tmp_hash & CP_HASH_MASK;
    tmp_file = darshan_global_job->name_table[hash_index];
    while(tmp_file)
    {
        if(tmp_file->log_file->hash == tmp_hash)
        {
            darshan_global_job->darshan_mru_file = tmp_file;
            return(tmp_file);
        }
        tmp_file = tmp_file->name_next;
    }

    /* see if we need to condense */
    if(darshan_global_job->file_count >= CP_MAX_FILES)
    {
        darshan_condense();
        return(&darshan_global_job->file_runtime_array[0]);
    }

    /* new, unique file */
    tmp_file = &darshan_global_job->file_runtime_array[darshan_global_job->file_count];

1343
    CP_SET(tmp_file, CP_MEM_ALIGNMENT, darshan_mem_alignment);
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    tmp_file->log_file->hash = tmp_hash;

    /* record last N characters of file name too */
    suffix_pointer = (char*)name;
    if(strlen(name) > CP_NAME_SUFFIX_LEN)
    {
        suffix_pointer += (strlen(name) - CP_NAME_SUFFIX_LEN);
    }
    strcpy(tmp_file->log_file->name_suffix, suffix_pointer); 

    darshan_global_job->file_count++;

    /* put into hash table, head of list at that index */
    tmp_file->name_prev = NULL;
    tmp_file->name_next = darshan_global_job->name_table[hash_index];
    if(tmp_file->name_next)
        tmp_file->name_next->name_prev = tmp_file;
    darshan_global_job->name_table[hash_index] = tmp_file;

    darshan_global_job->darshan_mru_file = tmp_file;
    return(tmp_file);
}

struct darshan_file_runtime* darshan_file_by_fd(int fd)
{
    int hash_index;
    struct darshan_file_runtime* tmp_file;

    if(!darshan_global_job)
    {
        return(NULL);
    }

    /* if we have already condensed the data, then just hand the first file
     * back
     */
    if(darshan_global_job->flags & CP_FLAG_CONDENSED)
    {
        return(&darshan_global_job->file_runtime_array[0]);
    }

    /* try mru first */
    if(darshan_global_job->darshan_mru_file && darshan_global_job->darshan_mru_file->fd == fd)
    {
        return(darshan_global_job->darshan_mru_file);
    }

    /* search hash table */
    /* TODO: confirm that fd as hash index is reasonable */
    hash_index = fd & CP_HASH_MASK;
    tmp_file = darshan_global_job->fd_table[hash_index];
    while(tmp_file)
    {
        if(tmp_file->fd == fd)
        {
            darshan_global_job->darshan_mru_file = tmp_file;
            return(tmp_file);
        }
        tmp_file = tmp_file->fd_next;
    }

    return(NULL);
}

static int access_comparison(const void* a_p, const void* b_p)
{
    const struct cp_access_counter* a = a_p;
    const struct cp_access_counter* b = b_p;

    if(a->size < b->size)
        return(-1);
    if(a->size > b->size)
        return(1);
    return(0);
}

/* cp_access_counter()
 *
 * records the occurance of a particular access size for a file,
 * current implementation uses glibc red black tree
 */
static void cp_access_counter(struct darshan_file_runtime* file, ssize_t size, enum cp_counter_type type)
{
    struct cp_access_counter* counter;
    struct cp_access_counter* found;
    void* tmp;
    void** root;
    int* count;
    struct cp_access_counter tmp_counter;

    /* don't count sizes or strides of 0 */
    if(size == 0)
        return;
    
    switch(type)
    {
        case CP_COUNTER_ACCESS:
            root = &file->access_root;
            count = &file->access_count;
            break;
        case CP_COUNTER_STRIDE:
            root = &file->stride_root;
            count = &file->stride_count;
            break;
        default:
            return;
    }

    /* check to see if this size is already recorded */
    tmp_counter.size = size;
    tmp_counter.freq = 1;
    tmp = tfind(&tmp_counter, root, access_comparison);
    if(tmp)
    {
        found = *(struct cp_access_counter**)tmp;
        found->freq++;
        return;
    }

    /* we can add a new one as long as we haven't hit the limit */
    if(*count < CP_MAX_ACCESS_COUNT_RUNTIME)
    {
        counter = malloc(sizeof(*counter));
        if(!counter)
        {
            return;
        }

        counter->size = size;
        counter->freq = 1;

        tmp = tsearch(counter, root, access_comparison);
        found = *(struct cp_access_counter**)tmp;
        /* if we get a new answer out here we are in trouble; this was
         * already checked with the tfind()
         */
        assert(found == counter);

        (*count)++;
    }

    return;
}

1488
#if 0
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void darshan_shutdown_bench(int argc, char** argv, int rank, int nprocs)
{
    int* fd_array;
    int64_t* size_array;
    int i;
    int nfiles;
    char path[256];
    int iters;
    
    /* combinations to build:
     * - 1 unique file per proc
     * - 1 shared file per proc
     * - 1024 unique file per proc
     * - 1024 shared per proc
     */

    srand(rank);
    fd_array = malloc(sizeof(int)*CP_MAX_FILES);
    size_array = malloc(sizeof(int64_t)*CP_MAX_ACCESS_COUNT_RUNTIME);

    assert(fd_array&&size_array);

    for(i=0; i<CP_MAX_FILES; i++)
        fd_array[i] = i;
    for(i=0; i<CP_MAX_ACCESS_COUNT_RUNTIME; i++)
        size_array[i] = rand();

    /* clear out existing stuff */
    darshan_walk_file_accesses(darshan_global_job);
    darshan_finalize(darshan_global_job);
    darshan_global_job = NULL;

    /***********************************************************/
    /* reset darshan to start clean */
    darshan_initialize(argc, argv, nprocs, rank);

    /* populate one unique file per proc */
    nfiles = 1;
    iters = 1;
    for(i=0; i<nfiles; i++)
    {
        sprintf(path, "%d-%d", i, rank);
        CP_RECORD_OPEN(fd_array[i], path, 777, 0, 0, 0);
    }

    for(i=0; i<iters; i++)
    {
        CP_RECORD_WRITE(size_array[(i/nfiles)%CP_MAX_ACCESS_COUNT_RUNTIME], fd_array[i%nfiles], size_array[(i/nfiles)%CP_MAX_ACCESS_COUNT_RUNTIME], 0, 1, 0, 1, 2);
    }

    if(rank == 0)
        printf("# 1 unique file per proc\n");
    darshan_shutdown(1);
    darshan_global_job = NULL;

    /***********************************************************/
    /* reset darshan to start clean */
    darshan_initialize(argc, argv, nprocs, rank);

    /* populate one shared file per proc */
    nfiles = 1;
    iters = 1;
    for(i=0; i<nfiles; i++)
    {
        sprintf(path, "%d", i);
        CP_RECORD_OPEN(fd_array[i], path, 777, 0, 0, 0);
    }

    for(i=0; i<iters; i++)
    {
        CP_RECORD_WRITE(size_array[(i/nfiles)%CP_MAX_ACCESS_COUNT_RUNTIME], fd_array[i%nfiles], size_array[(i/nfiles)%CP_MAX_ACCESS_COUNT_RUNTIME], 0, 1, 0, 1, 2);
    }

    if(rank == 0)
        printf("# 1 shared file across procs\n");
    darshan_shutdown(1);
    darshan_global_job = NULL;

    /***********************************************************/
    /* reset darshan to start clean */
    darshan_initialize(argc, argv, nprocs, rank);

    /* populate 1024 unique file per proc */
    nfiles = 1024;
    iters = 1024;
    for(i=0; i<nfiles; i++)
    {
        sprintf(path, "%d-%d", i, rank);
        CP_RECORD_OPEN(fd_array[i], path, 777, 0, 0, 0);
    }

    for(i=0; i<iters; i++)
    {
        CP_RECORD_WRITE(size_array[(i/nfiles)%CP_MAX_ACCESS_COUNT_RUNTIME], fd_array[i%nfiles], size_array[(i/nfiles)%CP_MAX_ACCESS_COUNT_RUNTIME], 0, 1, 0, 1, 2);
    }

    if(rank == 0)
        printf("# 1024 unique files per proc\n");
    darshan_shutdown(1);
    darshan_global_job = NULL;

    /***********************************************************/
    /* reset darshan to start clean */
    darshan_initialize(argc, argv, nprocs, rank);

    /* populate 1024 shared file per proc */
    nfiles = 1024;
    iters = 1024;
    for(i=0; i<nfiles; i++)
    {
        sprintf(path, "%d", i);
        CP_RECORD_OPEN(fd_array[i], path, 777, 0, 0, 0);
    }

    for(i=0; i<iters; i++)
    {
        CP_RECORD_WRITE(size_array[(i/nfiles)%CP_MAX_ACCESS_COUNT_RUNTIME], fd_array[i%nfiles], size_array[(i/nfiles)%CP_MAX_ACCESS_COUNT_RUNTIME], 0, 1, 0, 1, 2);
    }

    if(rank == 0)
        printf("# 1024 shared files across procs\n");
    darshan_shutdown(1);
    darshan_global_job = NULL;

    darshan_initialize(argc, argv, nprocs, rank);

    free(fd_array);
    free(size_array);

    return;
}

void darshan_search_bench(int argc, char** argv, int iters)
{
    int* fd_array;
    int64_t* size_array;
    int i,j;
    int skip = 32;
    int nfiles;
    char path[256];
    double tm1, tm2;
    
    fd_array = malloc(sizeof(int)*CP_MAX_FILES);
    size_array = malloc(sizeof(int64_t)*CP_MAX_ACCESS_COUNT_RUNTIME);

    assert(fd_array&&size_array);

    for(i=0; i<CP_MAX_FILES; i++)
        fd_array[i] = i;
    for(i=0; i<CP_MAX_ACCESS_COUNT_RUNTIME; i++)
        size_array[i] = rand();

    printf("#<iters>\t<numfiles>\t<numsizes>\t<total time>\t<per iter>\n");

    for(j=0; j<2; j++)
    {
        /* warm up */
        /* reset darshan to start clean */
        darshan_walk_file_accesses(darshan_global_job);
        darshan_finalize(darshan_global_job);
        darshan_global_job = NULL;
        darshan_initialize(argc, argv, 1, 0);

        nfiles = 1;
        /* populate entries for each file */
        for(i=0; i<nfiles; i++)
        {
            sprintf(path, "%d", i);
            CP_RECORD_OPEN(fd_array[i], path, 777, 0, 0, 0);
        }

        for(i=0; i<iters; i++)
        {
            if(j==0)
            {
                CP_RECORD_WRITE(size_array[(i/nfiles)%CP_MAX_ACCESS_COUNT_RUNTIME], fd_array[i%nfiles], size_array[(i/nfiles)%CP_MAX_ACCESS_COUNT_RUNTIME], 0, 1, 0, 1, 2);
            }
            else
            {
                CP_RECORD_WRITE(size_array[0], fd_array[i%nfiles], size_array[0], 0, 1, 0, 1, 2);
            }
        }

        /* real timing */
        for(nfiles=0; nfiles<=CP_MAX_FILES; nfiles += skip)
        {
            if(nfiles == 0)
                nfiles = 1;

            /* reset darshan to start clean */
            darshan_walk_file_accesses(darshan_global_job);
            darshan_finalize(darshan_global_job);
            darshan_global_job = NULL;
            darshan_initialize(argc, argv, 1, 0);

            /* populate entries for each file */
            for(i=0; i<nfiles; i++)
            {
                sprintf(path, "%d", i);
                CP_RECORD_OPEN(fd_array[i], path, 777, 0, 0, 0);
            }

            tm1 = darshan_wtime();
            for(i=0; i<iters; i++)
            {
                if(j==0)
                {
                    CP_RECORD_WRITE(size_array[(i/nfiles)%CP_MAX_ACCESS_COUNT_RUNTIME], fd_array[i%nfiles], size_array[(i/nfiles)%CP_MAX_ACCESS_COUNT_RUNTIME], 0, 1, 0, 1, 2);
                }
                else
                {
                    CP_RECORD_WRITE(size_array[0], fd_array[i%nfiles], size_array[0], 0, 1, 0, 1, 2);
                }
            }
            tm2 = darshan_wtime();

            // printf("#<iters>\t<numfiles>\t<numsizes>\t<total time>\t<per iter>\n");
            printf("%d\t%d\t%d\t%f\t%.12f\n", iters, nfiles, (j==0?CP_MAX_ACCESS_COUNT_RUNTIME:1), tm2-tm1, (tm2-tm1)/iters);

            if(nfiles == 1)
                nfiles = 0;
        }
    }

    free(fd_array);
    free(size_array);
}
1716
#endif
1717

1718 1719 1720 1721 1722
static double posix_wtime(void)
{
    return DARSHAN_MPI_CALL(PMPI_Wtime)();
}

1723 1724 1725 1726 1727 1728 1729
double darshan_wtime(void)
{
    if(!darshan_global_job || darshan_global_job->flags & CP_FLAG_NOTIMING)
    {
        return(0);
    }
    
1730
    return(posix_wtime());
1731 1732 1733 1734 1735 1736 1737 1738 1739 1740
}

/*
 * Local variables:
 *  c-indent-level: 4
 *  c-basic-offset: 4
 * End:
 *
 * vim: ts=8 sts=4 sw=4 expandtab
 */