darshan.h 5.19 KB
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/*
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 * Copyright (C) 2015 University of Chicago.
 * See COPYRIGHT notice in top-level directory.
 *
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 */

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#ifndef __DARSHAN_H
#define __DARSHAN_H

#include <unistd.h>
#include <sys/types.h>
#include <stdint.h>
#include <mpi.h>
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#include "darshan-log-format.h"
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#include "darshan-common.h"
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/* macros for declaring wrapper functions and calling MPI routines
 * consistently regardless of whether static or dynamic linking is used
 */
#ifdef DARSHAN_PRELOAD
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#include <dlfcn.h>
#include <stdlib.h>

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#define DARSHAN_FORWARD_DECL(__func,__ret,__args) \
  __ret (*__real_ ## __func)__args = NULL
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#define DARSHAN_DECL(__func) __func
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#define DARSHAN_MPI_CALL(__func) __real_ ## __func
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#define MAP_OR_FAIL(__func) \
    if (!(__real_ ## __func)) \
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    { \
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        __real_ ## __func = dlsym(RTLD_NEXT, #__func); \
        if(!(__real_ ## __func)) { \
           fprintf(stderr, "Darshan failed to map symbol: %s\n", #__func); \
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           exit(1); \
       } \
    }

#else

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#define DARSHAN_FORWARD_DECL(__name,__ret,__args) \
  extern __ret __real_ ## __name __args;
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#define DARSHAN_DECL(__name) __wrap_ ## __name

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#define DARSHAN_MPI_CALL(__func) __func
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#define MAP_OR_FAIL(__func)
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#endif

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/* default number of records to attempt to store for each module */
#define DARSHAN_DEF_MOD_REC_COUNT 1024

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/* module developers provide the following functions to darshan-core */
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struct darshan_module_funcs
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{
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    /* perform any necessary pre-shutdown steps
     *
     * NOTE: this typically includes disabling wrapper functions so
     * darshan-core can shutdown in a consistent state.
     */
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    void (*begin_shutdown)(void);
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    /* retrieve module data to write to log file
     *
     * NOTE: module developers can use this function to run collective
     * MPI operations at shutdown time. Typically this functionality
     * has been used to reduce records shared globablly (given in the
     * 'shared_recs' array) into a single data record.
     */
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    void (*get_output_data)(
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        MPI_Comm mod_comm,  /* MPI communicator to run collectives with */
        darshan_record_id *shared_recs, /* list of shared data record ids */
        int shared_rec_count, /* count of shared data records */
        void** mod_buf, /* output parameter to save module buffer address */
        int* mod_buf_sz /* output parameter to save module buffer size */
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    );
    /* shutdown module data structures */
    void (*shutdown)(void);
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};

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/*****************************************************
* darshan-core functions exported to darshan modules *
*****************************************************/
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/* darshan_core_register_module()
 *
 * Register module identifier 'mod_id' with the darshan-core runtime
 * environment, allowing the module to store I/O characterization data.
 * 'funcs' is a pointer to a structure containing each of the function
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 * pointers required by darshan-core to shut down the module.
 * 'inout_mod_buf_size' is an input/output argument, with it being
 * set to the requested amount of module memory on input, and set to
 * the amount allocated by darshan-core on output. If given, 'rank' is
 * a pointer to an integer which will contain the calling process's
 * MPI rank on return. If given, 'sys_mem_alignment' is a pointer to
 * an integer which will contain the memory alignment value Darshan
 * was configured with on return.
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 */
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void darshan_core_register_module(
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    darshan_module_id mod_id,
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    struct darshan_module_funcs *funcs,
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    int *inout_mod_buf_size,
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    int *rank,
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    int *sys_mem_alignment);
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/* darshan_core_unregister_module()
 * 
 * Unregisters module identifier 'mod_id' with the darshan-core runtime,
 * removing the given module from the resulting I/O characterization log.
 */
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void darshan_core_unregister_module(
    darshan_module_id mod_id);

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/* darshan_core_gen_record_id()
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 *
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 * Returns the Darshan record ID correpsonding to input string 'name'.
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 */
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darshan_record_id darshan_core_gen_record_id(
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    const char *name);
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/* darshan_core_register_record()
 *
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 * Register a record with the darshan-core runtime, allowing it to be
 * properly tracked and (potentially) correlated with records from other
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 * modules. 'rec_id' is the Darshan record id as given by the
 * `darshan_core_gen_record_id` function. 'name' is the the name of the
 * Darshan record (e.g., the full file path), which for now is just a
 * string. 'mod_id' is the identifier of the calling module. 'rec_len'
 * is the size of the record being registered with Darshan. If given,
 * 'file_alignment' is a pointer to an integer which on return will
 * contain the corresponding file system alignment of the file system
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 * path 'name' resides on. Returns a pointer to the address the record
 * should be written to on success, NULL on failure.
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 */
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void *darshan_core_register_record(
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    darshan_record_id rec_id,
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    const char *name,
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    darshan_module_id mod_id,
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    int rec_len,
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    int *file_alignment);
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/* darshan_core_wtime()
 *
 * Returns the elapsed time relative to (roughly) the start of
 * the application.
 */
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double darshan_core_wtime(void);
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/* darshan_core_excluded_path()
 *
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 * Returns true (1) if the given file path 'path' is in Darshan's
 * list of excluded file paths, false (0) otherwise.
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 */
int darshan_core_excluded_path(
    const char * path);

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#endif /* __DARSHAN_H */