codes-darshan-io-wrkld.c 58.1 KB
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/*
 * Copyright (C) 2013 University of Chicago.
 * See COPYRIGHT notice in top-level directory.
 *
 */
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#include <assert.h>
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#include <math.h>
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#include "codes/codes-workload.h"
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#include "codes/quickhash.h"
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#include "codes-workload-method.h"
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#include "darshan-logutils.h"
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#define DEF_INTER_IO_DELAY_PCT 0.2
#define DEF_INTER_CYC_DELAY_PCT 0.4

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#define DARSHAN_NEGLIGIBLE_DELAY .001

#define RANK_HASH_TABLE_SIZE 397

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#define MIN(a, b) (((a) < (b)) ? (a) : (b))
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#define ALIGN_BY_8(x) ((x) + ((x) % 8))

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/* structure for storing a darshan workload operation (a codes op with 2 timestamps) */
struct darshan_io_op
{
    struct codes_workload_op codes_op;
    double start_time;
    double end_time;
};

/* I/O context structure managed by each rank in the darshan workload */
struct rank_io_context
{
    int64_t my_rank;
    double last_op_time;
    void *io_op_dat;
    struct qhash_head hash_link;
};

/* Darshan workload generator's implementation of the CODES workload API */
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static int darshan_io_workload_load(const char *params, int rank);
static void darshan_io_workload_get_next(int rank, struct codes_workload_op *op);
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static int darshan_io_workload_get_rank_cnt(const char *params);
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static int darshan_rank_hash_compare(void *key, struct qhash_head *link);

/* Darshan I/O op data structure access (insert, remove) abstraction */
static void *darshan_init_io_op_dat(void);
static void darshan_insert_next_io_op(void *io_op_dat, struct darshan_io_op *io_op);
static void darshan_remove_next_io_op(void *io_op_dat, struct darshan_io_op *io_op,
                                      double last_op_time);
static void darshan_finalize_io_op_dat(void *io_op_dat);
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static void darshan_print_io_ops(void *io_op_dat, int rank, FILE *log_stream);
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static int darshan_io_op_compare(const void *p1, const void *p2);

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/* Helper functions for implementing the Darshan workload generator */
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static void generate_psx_ind_file_events(struct darshan_file *file,
                                         struct rank_io_context *io_context);
static void generate_psx_coll_file_events(struct darshan_file *file,
                                          struct rank_io_context *io_context,
                                          int64_t nprocs, int64_t aggregator_cnt);
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static double generate_psx_open_event(struct darshan_file *file, int create_flag,
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                                      double meta_op_time, double cur_time,
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                                      struct rank_io_context *io_context, int insert_flag);
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static double generate_psx_close_event(struct darshan_file *file, double meta_op_time,
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                                       double cur_time, struct rank_io_context *io_context,
                                       int insert_flag);
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static double generate_barrier_event(struct darshan_file *file, int64_t root, double cur_time,
                                     struct rank_io_context *io_context);
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static double generate_psx_ind_io_events(struct darshan_file *file, int64_t io_ops_this_cycle,
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                                         double inter_io_delay, double meta_op_time,
                                         double cur_time, struct rank_io_context *io_context);
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static double generate_psx_coll_io_events(struct darshan_file *file, int64_t ind_io_ops_this_cycle,
                                          int64_t coll_io_ops_this_cycle, int64_t nprocs,
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                                          int64_t aggregator_cnt, double inter_io_delay,
                                          double meta_op_time, double cur_time,
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                                          struct rank_io_context *io_context);
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static void determine_io_params(struct darshan_file *file, int write_flag, int64_t io_this_op,
                                int64_t proc_count, size_t *io_sz, off_t *io_off);
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static void calc_io_delays(struct darshan_file *file, int64_t num_opens, int64_t num_io_ops,
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                           double total_delay, double *first_io_delay, double *close_delay,
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                           double *inter_open_delay, double *inter_io_delay);
static void file_sanity_check(struct darshan_file *file, struct darshan_job *job);

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/* workload method name and function pointers for the CODES workload API */
struct codes_workload_method darshan_io_workload_method =
{
    .method_name = "darshan_io_workload",
    .codes_workload_load = darshan_io_workload_load,
    .codes_workload_get_next = darshan_io_workload_get_next,
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    .codes_workload_get_rank_cnt = darshan_io_workload_get_rank_cnt,
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};

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static int total_rank_cnt = 0;

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/* hash table to store per-rank workload contexts */
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static struct qhash_table *rank_tbl = NULL;
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static int rank_tbl_pop = 0;
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/* load the workload generator for this rank, given input params */
static int darshan_io_workload_load(const char *params, int rank)
{
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    darshan_params *d_params = (darshan_params *)params;
    darshan_fd logfile_fd;
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    struct darshan_job job;
    struct darshan_file next_file;
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    struct rank_io_context *my_ctx;
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    int ret;
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    if (!d_params)
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        return -1;

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    /* open the darshan log to begin reading in file i/o info */
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    logfile_fd = darshan_log_open(d_params->log_file_path, "r");
    if (logfile_fd < 0)
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        return -1;
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    /* get the per-job stats from the log */
    ret = darshan_log_getjob(logfile_fd, &job);
    if (ret < 0)
    {
        darshan_log_close(logfile_fd);
        return -1;
    }
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    if (!total_rank_cnt)
    {
        total_rank_cnt = job.nprocs;
    }
    assert(rank < total_rank_cnt);
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    /* allocate the i/o context needed by this rank */
    my_ctx = malloc(sizeof(struct rank_io_context));
    if (!my_ctx)
    {
        darshan_log_close(logfile_fd);
        return -1;
    }
    my_ctx->my_rank = (int64_t)rank;
    my_ctx->last_op_time = 0.0;
    my_ctx->io_op_dat = darshan_init_io_op_dat();

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    /* loop over all files contained in the log file */
    while ((ret = darshan_log_getfile(logfile_fd, &job, &next_file)) > 0)
    {
        /* generate all i/o events contained in this independent file */
        if (next_file.rank == rank)
        {
            /* make sure the file i/o counters are valid */
            file_sanity_check(&next_file, &job);

            /* generate i/o events and store them in this rank's workload context */
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            generate_psx_ind_file_events(&next_file, my_ctx);
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        }
        /* generate all i/o events involving this rank in this collective file */
        else if (next_file.rank == -1)
        {
            /* make sure the file i/o counters are valid */
            file_sanity_check(&next_file, &job);
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            /* generate collective i/o events and store them in the rank context */
            generate_psx_coll_file_events(&next_file, my_ctx, job.nprocs, d_params->aggregator_cnt);
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        }
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        else
            continue;
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        assert(next_file.counters[CP_POSIX_OPENS] == 0);
        assert(next_file.counters[CP_POSIX_READS] == 0);
        assert(next_file.counters[CP_POSIX_WRITES] == 0);
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    }
    if (ret < 0)
        return -1;

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    darshan_log_close(logfile_fd);
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    /* finalize the rank's i/o context so i/o ops may be retrieved later (in order) */
    darshan_finalize_io_op_dat(my_ctx->io_op_dat);

    /* initialize the hash table of rank contexts, if it has not been initialized */
    if (!rank_tbl)
    {
        rank_tbl = qhash_init(darshan_rank_hash_compare, quickhash_64bit_hash, RANK_HASH_TABLE_SIZE);
        if (!rank_tbl)
            return -1;
    }

    /* add this rank context to the hash table */
    qhash_add(rank_tbl, &(my_ctx->my_rank), &(my_ctx->hash_link));
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    rank_tbl_pop++;
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    /* TODO: do we want this long-term */
    if (d_params->stream)
    {
        darshan_print_io_ops(my_ctx->io_op_dat, rank, d_params->stream);
    }
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    return 0;
}

/* pull the next event (independent or collective) for this rank from its event context */
static void darshan_io_workload_get_next(int rank, struct codes_workload_op *op)
{
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    int64_t my_rank = (int64_t)rank;
    struct qhash_head *hash_link = NULL;
    struct rank_io_context *tmp = NULL;
    struct darshan_io_op next_io_op;

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    assert(rank < total_rank_cnt);

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    /* find i/o context for this rank in the rank hash table */
    hash_link = qhash_search(rank_tbl, &my_rank);

    /* terminate the workload if there is no valid rank context */
    if (!hash_link)
    {
        op->op_type = CODES_WK_END;
        return;
    }

    /* get access to the rank's io_context data */
    tmp = qhash_entry(hash_link, struct rank_io_context, hash_link);
    assert(tmp->my_rank == my_rank);

    /* get the next darshan i/o op out of this rank's context */
    darshan_remove_next_io_op(tmp->io_op_dat, &next_io_op, tmp->last_op_time);

    /* free the rank's i/o context if this is the last i/o op */
    if (next_io_op.codes_op.op_type == CODES_WK_END)
    {
        qhash_del(hash_link);
        free(tmp);
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        rank_tbl_pop--;
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        if (!rank_tbl_pop){
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            qhash_finalize(rank_tbl);
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            rank_tbl = NULL;
        }
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    }
    else
    {
        /* else, set the last op time to be the end of the returned op */
        tmp->last_op_time = next_io_op.end_time;
    }

    /* return the codes op contained in the darshan i/o op */
    *op = next_io_op.codes_op;
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    return;
}

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static int darshan_io_workload_get_rank_cnt(const char *params)
{
    darshan_params *d_params = (darshan_params *)params;
    darshan_fd logfile_fd;
    struct darshan_job job;
    int ret;

    if (!d_params)
        return -1;

    /* open the darshan log to begin reading in file i/o info */
    logfile_fd = darshan_log_open(d_params->log_file_path, "r");
    if (logfile_fd < 0)
        return -1;

    /* get the per-job stats from the log */
    ret = darshan_log_getjob(logfile_fd, &job);
    if (ret < 0)
    {
        darshan_log_close(logfile_fd);
        return -1;
    }

    darshan_log_close(logfile_fd);

    return job.nprocs;
}

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/* comparison function for comparing two hash keys (used for storing multiple io contexts) */
static int darshan_rank_hash_compare(
    void *key, struct qhash_head *link)
{
    int64_t *in_rank = (int64_t *)key;
    struct rank_io_context *tmp;

    tmp = qhash_entry(link, struct rank_io_context, hash_link);
    if (tmp->my_rank == *in_rank)
        return 1;

    return 0;
}

/*****************************************/
/*                                       */
/*   Darshan I/O op storage abstraction  */
/*                                       */
/*****************************************/

#define DARSHAN_IO_OP_INC_CNT 100000

/* dynamically allocated array data structure for storing darshan i/o events */
struct darshan_io_dat_array
{
    struct darshan_io_op *op_array;
    int64_t op_arr_ndx;
    int64_t op_arr_cnt;
};

/* initialize the dynamic array data structure */
static void *darshan_init_io_op_dat()
{
    struct darshan_io_dat_array *tmp;

    /* initialize the array data structure */
    tmp = malloc(sizeof(struct darshan_io_dat_array));
    assert(tmp);
    tmp->op_array = malloc(DARSHAN_IO_OP_INC_CNT * sizeof(struct darshan_io_op));
    assert(tmp->op_array);
    tmp->op_arr_ndx = 0;
    tmp->op_arr_cnt = DARSHAN_IO_OP_INC_CNT;

    /* return the array info for this rank's i/o context */
    return (void *)tmp;
}

/* store the i/o event in this rank's i/o context */
static void darshan_insert_next_io_op(
    void *io_op_dat, struct darshan_io_op *io_op)
{
    struct darshan_io_dat_array *array = (struct darshan_io_dat_array *)io_op_dat;
    struct darshan_io_op *tmp;

    /* realloc array if it is already full */
    if (array->op_arr_ndx == array->op_arr_cnt)
    {
        tmp = malloc((array->op_arr_cnt + DARSHAN_IO_OP_INC_CNT) * sizeof(struct darshan_io_op));
        assert(tmp);
        memcpy(tmp, array->op_array, array->op_arr_cnt * sizeof(struct darshan_io_op));
        free(array->op_array);
        array->op_array = tmp;
        array->op_arr_cnt += DARSHAN_IO_OP_INC_CNT;
    }

    /* add the darshan i/o op to the array */
    array->op_array[array->op_arr_ndx++] = *io_op;

    return;
}

/* pull the next i/o event out of this rank's i/o context */
static void darshan_remove_next_io_op(
    void *io_op_dat, struct darshan_io_op *io_op, double last_op_time)
{
    struct darshan_io_dat_array *array = (struct darshan_io_dat_array *)io_op_dat;

    /* if the array has been scanned completely already */
    if (array->op_arr_ndx == array->op_arr_cnt)
    {
        /* no more events just end the workload */
        io_op->codes_op.op_type = CODES_WK_END;

        /* free data structures */
        free(array->op_array);
        free(array);
    }
    else
    {
        struct darshan_io_op *tmp = &(array->op_array[array->op_arr_ndx]);

        if ((tmp->start_time - last_op_time) < DARSHAN_NEGLIGIBLE_DELAY)
        {
            /* there is no delay, just return the next op in the array */
            *io_op = *tmp;
            array->op_arr_ndx++;
        }
        else
        {
            /* there is a nonnegligible delay, so generate and return a delay event */
            io_op->codes_op.op_type = CODES_WK_DELAY;
            io_op->codes_op.u.delay.seconds = tmp->start_time - last_op_time;
            io_op->start_time = last_op_time;
            io_op->end_time = tmp->start_time;
        }
    }
}

/* sort the dynamic array in order of i/o op start time */
static void darshan_finalize_io_op_dat(
    void *io_op_dat)
{
    struct darshan_io_dat_array *array = (struct darshan_io_dat_array *)io_op_dat;

    /* sort this rank's i/o op list */
    qsort(array->op_array, array->op_arr_ndx, sizeof(struct darshan_io_op), darshan_io_op_compare);
    array->op_arr_cnt = array->op_arr_ndx;
    array->op_arr_ndx = 0;

    return;
}

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/* print the events for this rank in order */
void darshan_print_io_ops(void *io_op_dat, int rank, FILE *log_stream)
{
    struct darshan_io_dat_array *io_array = (struct darshan_io_dat_array *)io_op_dat;
    struct darshan_io_op *event_list = io_array->op_array;
    int64_t event_list_cnt = io_array->op_arr_cnt;
    int64_t i;

    if (!event_list_cnt)
        return;

    for (i = 0; i < event_list_cnt; i++)
    {
        if (event_list[i].codes_op.op_type == CODES_WK_OPEN)
        {
            if (event_list[i].codes_op.u.open.create_flag == 0)
            {
                fprintf(log_stream, "Rank %d OPEN %"PRIu64" (%lf - %lf)\n",
                        rank,
                        event_list[i].codes_op.u.open.file_id,
                        event_list[i].start_time,
                        event_list[i].end_time);
            }
            else
            {
                fprintf(log_stream, "Rank %d CREATE %"PRIu64" (%lf - %lf)\n",
                        rank,
                        event_list[i].codes_op.u.open.file_id,
                        event_list[i].start_time,
                        event_list[i].end_time);
            }
        }
        else if (event_list[i].codes_op.op_type == CODES_WK_CLOSE)
        {
            fprintf(log_stream, "Rank %d CLOSE %"PRIu64" (%lf - %lf)\n",
                    rank,
                    event_list[i].codes_op.u.close.file_id,
                    event_list[i].start_time,
                    event_list[i].end_time);
        }
        else if (event_list[i].codes_op.op_type == CODES_WK_READ)
        {
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            fprintf(log_stream, "Rank %d READ %"PRIu64" [sz = %"PRId64", off = %"PRId64
                    "] (%lf - %lf)\n",
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                    rank,
                    event_list[i].codes_op.u.read.file_id,
                    (int64_t)event_list[i].codes_op.u.read.size,
                    (int64_t)event_list[i].codes_op.u.read.offset,
                    event_list[i].start_time,
                    event_list[i].end_time);
        }
        else if (event_list[i].codes_op.op_type == CODES_WK_WRITE)
        {
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            fprintf(log_stream, "Rank %d WRITE %"PRIu64" [sz = %"PRId64", off = %"PRId64
                    "] (%lf - %lf)\n",
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                    rank,
                    event_list[i].codes_op.u.write.file_id,
                    (int64_t)event_list[i].codes_op.u.write.size,
                    (int64_t)event_list[i].codes_op.u.write.offset,
                    event_list[i].start_time,
                    event_list[i].end_time);
        }
        else if (event_list[i].codes_op.op_type == CODES_WK_BARRIER)
        {
            fprintf(log_stream, "****");
        }
    }

    return;
}

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/* comparison function for sorting darshan_io_ops in order of start timestamps */
static int darshan_io_op_compare(
    const void *p1, const void *p2)
{
    struct darshan_io_op *a = (struct darshan_io_op *)p1;
    struct darshan_io_op *b = (struct darshan_io_op *)p2;

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

/*****************************************/
/*                                       */
/* Darshan workload generation functions */
/*                                       */
/*****************************************/
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/* generate events for an independently opened file, and store these events */
static void generate_psx_ind_file_events(
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    struct darshan_file *file, struct rank_io_context *io_context)
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{
    int64_t io_ops_this_cycle;
    double cur_time = file->fcounters[CP_F_OPEN_TIMESTAMP];
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    double total_delay;
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    double first_io_delay = 0.0;
    double close_delay = 0.0;
    double inter_open_delay = 0.0;
    double inter_io_delay = 0.0;
    double meta_op_time;
    int create_flag;
    int64_t i;

    /* if the file was never really opened, just return because we have no timing info */
    if (file->counters[CP_POSIX_OPENS] == 0)
        return;

    /* determine delay available per open-io-close cycle */
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    total_delay = file->fcounters[CP_F_CLOSE_TIMESTAMP] - file->fcounters[CP_F_OPEN_TIMESTAMP] -
                  file->fcounters[CP_F_POSIX_READ_TIME] - file->fcounters[CP_F_POSIX_WRITE_TIME] -
                  file->fcounters[CP_F_POSIX_META_TIME];
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    /* calculate synthetic delay values */
    calc_io_delays(file, file->counters[CP_POSIX_OPENS],
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                   file->counters[CP_POSIX_READS] + file->counters[CP_POSIX_WRITES], total_delay,
                   &first_io_delay, &close_delay, &inter_open_delay, &inter_io_delay);
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    /* calculate average meta op time (for i/o and opens/closes) */
    /* TODO: this needs to be updated when we add in stat, seek, etc. */
    meta_op_time = file->fcounters[CP_F_POSIX_META_TIME] / ((2 * file->counters[CP_POSIX_OPENS]) +
                   file->counters[CP_POSIX_READS] + file->counters[CP_POSIX_WRITES]);

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532
    /* set the create flag if the file was written to */
    if (file->counters[CP_BYTES_WRITTEN])
    {
        create_flag = 1;
    }
533
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536
537
538

    /* generate open/io/close events for all cycles */
    /* TODO: add stats */
    for (i = 0; file->counters[CP_POSIX_OPENS]; i++, file->counters[CP_POSIX_OPENS]--)
    {
        /* generate an open event */
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        cur_time = generate_psx_open_event(file, create_flag, meta_op_time, cur_time,
                                           io_context, 1);
541
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549
550
        create_flag = 0;

        /* account for potential delay from first open to first io */
        cur_time += first_io_delay;

        io_ops_this_cycle = ceil((double)(file->counters[CP_POSIX_READS] +
                                 file->counters[CP_POSIX_WRITES]) /
                                 file->counters[CP_POSIX_OPENS]);

        /* perform the calculated number of i/o operations for this file open */
551
        cur_time = generate_psx_ind_io_events(file, io_ops_this_cycle, inter_io_delay,
552
                                              meta_op_time, cur_time, io_context);
553
554
555
556
557

        /* account for potential delay from last io to close */
        cur_time += close_delay;

        /* generate a close for the open event at the start of the loop */
558
        cur_time = generate_psx_close_event(file, meta_op_time, cur_time, io_context, 1);
559
560
561
562
563
564
565

        /* account for potential interopen delay if more than one open */
        if (file->counters[CP_POSIX_OPENS] > 1)
        {
            cur_time += inter_open_delay;
        }
    }
566
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571
572
573
574

    return;
}

/* generate events for the i/o ops stored in a collectively opened file for this rank */
void generate_psx_coll_file_events(
    struct darshan_file *file, struct rank_io_context *io_context,
    int64_t nprocs, int64_t in_agg_cnt)
{
575
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579
    int64_t open_cycles;
    int64_t total_ind_opens;
    int64_t total_coll_opens;
    int64_t ind_opens_this_cycle;
    int64_t coll_opens_this_cycle;
580
581
    int64_t extra_opens = 0;
    int64_t extra_io_ops = 0;
582
    int64_t total_io_ops = file->counters[CP_POSIX_READS] + file->counters[CP_POSIX_WRITES];
583
584
585
586
    int64_t total_ind_io_ops;
    int64_t total_coll_io_ops;
    int64_t ind_io_ops_this_cycle;
    int64_t coll_io_ops_this_cycle;
587
    int64_t rank_cnt;
588
589
    int create_flag = 0;
    double cur_time = file->fcounters[CP_F_OPEN_TIMESTAMP];
590
    double total_delay;
591
592
593
594
595
    double first_io_delay = 0.0;
    double close_delay = 0.0;
    double inter_cycle_delay = 0.0;
    double inter_io_delay = 0.0;
    double meta_op_time;
596
    int64_t i;
597
598
599
600
601
602
603
604
605
606

    /* the collective file was never opened (i.e., just stat-ed), so return */
    if (!(file->counters[CP_POSIX_OPENS]))
        return;

    /*  in this case, posix opens are less than mpi opens...
     *  this is probably a mpi deferred open -- assume app will not use this, currently.
     */
    assert(file->counters[CP_POSIX_OPENS] >= nprocs);

607
608
    if (file->counters[CP_COLL_OPENS] || file->counters[CP_INDEP_OPENS])
    {
609
610
        extra_opens = file->counters[CP_POSIX_OPENS] - file->counters[CP_COLL_OPENS] -
                      file->counters[CP_INDEP_OPENS];
611

612
613
        total_coll_opens = file->counters[CP_COLL_OPENS];
        total_ind_opens = file->counters[CP_POSIX_OPENS] - total_coll_opens - extra_opens;
614
615
616
617

        total_ind_io_ops = file->counters[CP_INDEP_READS] + file->counters[CP_INDEP_WRITES];
        total_coll_io_ops = (file->counters[CP_COLL_READS] + file->counters[CP_COLL_WRITES]) / nprocs;

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623
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625
        if (file->counters[CP_COLL_OPENS])
        {
            total_delay = (file->fcounters[CP_F_CLOSE_TIMESTAMP] -
                           file->fcounters[CP_F_OPEN_TIMESTAMP] -
                           (file->fcounters[CP_F_POSIX_READ_TIME] / in_agg_cnt) -
                           (file->fcounters[CP_F_POSIX_WRITE_TIME] / in_agg_cnt) -
                           (file->fcounters[CP_F_POSIX_META_TIME] / in_agg_cnt));

626
            open_cycles = total_coll_opens / nprocs;
627
628
629
630
            calc_io_delays(file, ceil(((double)(total_coll_opens + total_ind_opens)) / nprocs),
                           total_coll_io_ops + ceil((double)total_ind_io_ops / nprocs), total_delay,
                           &first_io_delay, &close_delay, &inter_cycle_delay, &inter_io_delay);
        }
631
        else
632
633
634
635
636
637
        {
            total_delay = (file->fcounters[CP_F_CLOSE_TIMESTAMP] -
                           file->fcounters[CP_F_OPEN_TIMESTAMP] -
                           (file->fcounters[CP_F_POSIX_READ_TIME] / nprocs) -
                           (file->fcounters[CP_F_POSIX_WRITE_TIME] / nprocs) -
                           (file->fcounters[CP_F_POSIX_META_TIME] / nprocs));
638

639
640
641
642
            open_cycles = ceil((double)total_ind_opens / nprocs);
            calc_io_delays(file, open_cycles, ceil((double)total_ind_io_ops / nprocs), total_delay,
                           &first_io_delay, &close_delay, &inter_cycle_delay, &inter_io_delay);
        }
643
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648
649
650
651
652
653
    }
    else
    {
        extra_opens = file->counters[CP_POSIX_OPENS] % nprocs;
        if (extra_opens && ((file->counters[CP_POSIX_OPENS] / nprocs) % extra_opens))
        {
            extra_opens = 0;
        }
        else
        {
            extra_io_ops = total_io_ops % nprocs;
654
655
656
657
658
            if (extra_io_ops != extra_opens)
            {
                extra_opens = 0;
                extra_io_ops = 0;
            }
659
660
661
        }

        total_coll_opens = 0;
662
        total_ind_opens = file->counters[CP_POSIX_OPENS] - extra_opens;
663
664
665

        total_ind_io_ops = total_io_ops - extra_io_ops;
        total_coll_io_ops = 0;
666

667
668
669
670
671
672
        total_delay = (file->fcounters[CP_F_CLOSE_TIMESTAMP] -
                       file->fcounters[CP_F_OPEN_TIMESTAMP] -
                       (file->fcounters[CP_F_POSIX_READ_TIME] / nprocs) -
                       (file->fcounters[CP_F_POSIX_WRITE_TIME] / nprocs) -
                       (file->fcounters[CP_F_POSIX_META_TIME] / nprocs));

673
674
675
        open_cycles = ceil((double)total_ind_opens / nprocs);
        calc_io_delays(file, open_cycles, ceil((double)total_ind_io_ops / nprocs), total_delay,
                       &first_io_delay, &close_delay, &inter_cycle_delay, &inter_io_delay);
676
677
678
    }
    assert(extra_opens <= open_cycles);

679
680
681
682
    /* calculate average meta op time (for i/o and opens/closes) */
    meta_op_time = file->fcounters[CP_F_POSIX_META_TIME] / ((2 * file->counters[CP_POSIX_OPENS]) +
                   file->counters[CP_POSIX_READS] + file->counters[CP_POSIX_WRITES]);

683
684
685
686
687
    /* it is rare to overwrite existing files, so set the create flag */
    if (file->counters[CP_BYTES_WRITTEN])
    {
        create_flag = 1;
    }
688

689
690
    /* generate all events for this collectively opened file */
    for (i = 0; i < open_cycles; i++)
691
    {
692
693
        ind_opens_this_cycle = ceil((double)total_ind_opens / (open_cycles - i));
        coll_opens_this_cycle = total_coll_opens / (open_cycles - i);
694

695
696
697
        /* assign any extra opens to rank 0 (these may correspond to file creations or
         * header reads/writes)
         */
698
        if (extra_opens && !(i % (open_cycles / extra_opens)))
699
        {
700
701
            cur_time = generate_psx_open_event(file, create_flag, meta_op_time, cur_time,
                                               io_context, (io_context->my_rank == 0));
702
703
            create_flag = 0;

704
705
706
707
708
709
            if (!file->counters[CP_COLL_OPENS] && !file->counters[CP_INDEP_OPENS])
            {
                cur_time = generate_psx_coll_io_events(file, 1, 0, nprocs, nprocs, 0.0,
                                                       meta_op_time, cur_time, io_context);
                extra_io_ops--;
            }
710

711
712
            cur_time = generate_psx_close_event(file, meta_op_time, cur_time, io_context,
                                                (io_context->my_rank == 0));
713
714
715
            file->counters[CP_POSIX_OPENS]--;
        }

716
        while (ind_opens_this_cycle)
717
        {
718
719
720
721
722
            if (ind_opens_this_cycle >= nprocs)
                rank_cnt = nprocs;
            else
                rank_cnt = ind_opens_this_cycle;

723
724
            cur_time = generate_psx_open_event(file, create_flag, meta_op_time, cur_time,
                                               io_context, (io_context->my_rank < rank_cnt));
725
726
            create_flag = 0;

727
728
729
730
            cur_time += first_io_delay;

            ind_io_ops_this_cycle = ceil(((double)total_ind_io_ops / total_ind_opens) * rank_cnt);
            cur_time = generate_psx_coll_io_events(file, ind_io_ops_this_cycle, 0, nprocs,
731
                                                   nprocs, inter_io_delay, meta_op_time,
732
733
734
735
                                                   cur_time, io_context);
            total_ind_io_ops -= ind_io_ops_this_cycle;

            cur_time += close_delay;
736

737
738
            cur_time = generate_psx_close_event(file, meta_op_time, cur_time, io_context,
                                                (io_context->my_rank < rank_cnt));
739

740
741
742
743
744
745
            file->counters[CP_POSIX_OPENS] -= rank_cnt;
            ind_opens_this_cycle -= rank_cnt;
            total_ind_opens -= rank_cnt;

            if (file->counters[CP_POSIX_OPENS])
                cur_time += inter_cycle_delay;
746
747
        }

748
        while (coll_opens_this_cycle)
749
        {
750
            assert(!create_flag);
751

752
            cur_time = generate_barrier_event(file, 0, cur_time, io_context);
753
754

            cur_time = generate_psx_open_event(file, create_flag, meta_op_time,
755
                                               cur_time, io_context, 1);
756

757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
            cur_time += first_io_delay;

            if (file->counters[CP_INDEP_OPENS])
                ind_io_ops_this_cycle = 0;
            else
                ind_io_ops_this_cycle = ceil((double)total_ind_io_ops / 
                                             (file->counters[CP_COLL_OPENS] / nprocs));

            coll_io_ops_this_cycle = ceil((double)total_coll_io_ops / 
                                          (file->counters[CP_COLL_OPENS] / nprocs));
            cur_time = generate_psx_coll_io_events(file, ind_io_ops_this_cycle,
                                                   coll_io_ops_this_cycle, nprocs, in_agg_cnt,
                                                   inter_io_delay, meta_op_time,
                                                   cur_time, io_context);
            total_ind_io_ops -= ind_io_ops_this_cycle;
            total_coll_io_ops -= coll_io_ops_this_cycle;

            cur_time += close_delay;
775

776
            cur_time = generate_psx_close_event(file, meta_op_time, cur_time, io_context, 1);
777
778

            file->counters[CP_POSIX_OPENS] -= nprocs;
779
780
            file->counters[CP_COLL_OPENS] -= nprocs;
            coll_opens_this_cycle -= nprocs;
781
782
783
784
            total_coll_opens -= nprocs;

            if (file->counters[CP_POSIX_OPENS])
                cur_time += inter_cycle_delay;
785
786
        }
    }
787
788
789
790
791
792

    return;
}

/* fill in an open event structure and store it with the rank context */
static double generate_psx_open_event(
793
    struct darshan_file *file, int create_flag, double meta_op_time,
794
    double cur_time, struct rank_io_context *io_context, int insert_flag)
795
{
796
797
798
799
800
801
802
    struct darshan_io_op next_io_op = 
    {
        .codes_op.op_type = CODES_WK_OPEN,
        .codes_op.u.open.file_id = file->hash,
        .codes_op.u.open.create_flag = create_flag,
        .start_time = cur_time
    };
803
804
805

    /* set the end time of the event based on time spent in POSIX meta operations */
    cur_time += meta_op_time;
806
    next_io_op.end_time = cur_time;
807

808
    /* store the open event (if this rank performed it) */
809
    if (insert_flag)
810
        darshan_insert_next_io_op(io_context->io_op_dat, &next_io_op);
811
812
813
814
815
816

    return cur_time;
}

/* fill in a close event structure and store it with the rank context */
static double generate_psx_close_event(
817
    struct darshan_file *file, double meta_op_time, double cur_time,
818
    struct rank_io_context *io_context, int insert_flag)
819
{
820
821
822
823
824
825
    struct darshan_io_op next_io_op =
    {
        .codes_op.op_type = CODES_WK_CLOSE,
        .codes_op.u.close.file_id = file->hash,
        .start_time = cur_time
    };
826
827
828

    /* set the end time of the event based on time spent in POSIX meta operations */
    cur_time += meta_op_time;
829
    next_io_op.end_time = cur_time;
830

831
    /* store the close event (if this rank performed it) */
832
    if (insert_flag)
833
        darshan_insert_next_io_op(io_context->io_op_dat, &next_io_op);
834
835
836
837
838
839

    return cur_time;
}

/* fill in a barrier event structure and store it with the rank context */
static double generate_barrier_event(
840
    struct darshan_file *file, int64_t root, double cur_time, struct rank_io_context *io_context)
841
{
842
843
844
845
846
847
848
    struct darshan_io_op next_io_op =
    {
        .codes_op.op_type = CODES_WK_BARRIER, 
        .codes_op.u.barrier.count = -1, /* all processes */
        .codes_op.u.barrier.root = root,
        .start_time = cur_time
    };
849
850

    cur_time += .000001; /* small synthetic delay representing time to barrier */
851
    next_io_op.end_time = cur_time;
852

853
    /* store the barrier event */
854
    if (file->rank == -1)
855
        darshan_insert_next_io_op(io_context->io_op_dat, &next_io_op);
856
857
858
859
860
861

    return cur_time;
}

/* generate all i/o events for one independent file open and store them with the rank context */
static double generate_psx_ind_io_events(
862
863
    struct darshan_file *file, int64_t io_ops_this_cycle, double inter_io_delay,
    double meta_op_time, double cur_time, struct rank_io_context *io_context)
864
865
866
867
868
869
870
871
872
{
    static int rw = -1; /* rw = 1 for write, 0 for read, -1 for uninitialized */
    static int64_t io_ops_this_rw;
    static double rd_bw = 0.0, wr_bw = 0.0;
    int64_t psx_rw_ops_remaining = file->counters[CP_POSIX_READS] + file->counters[CP_POSIX_WRITES];
    double io_op_time;
    size_t io_sz;
    off_t io_off;
    int64_t i;
873
    struct darshan_io_op next_io_op;
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909

    /* if there are no i/o ops, just return immediately */
    if (!io_ops_this_cycle)
        return cur_time;

    /* initialze static variables when a new file is opened */
    if (rw == -1)
    {
        /* initialize rw to be the first i/o operation found in the log */
        if (file->fcounters[CP_F_WRITE_START_TIMESTAMP] == 0.0)
            rw = 0;
        else if (file->fcounters[CP_F_READ_START_TIMESTAMP] == 0.0)
            rw = 1;
        else
            rw = (file->fcounters[CP_F_READ_START_TIMESTAMP] <
                  file->fcounters[CP_F_WRITE_START_TIMESTAMP]) ? 0 : 1;

        /* determine how many io ops to do before next rw switch */
        if (!rw)
            io_ops_this_rw = file->counters[CP_POSIX_READS] /
                             ((file->counters[CP_RW_SWITCHES] / 2) + 1);
        else
            io_ops_this_rw = file->counters[CP_POSIX_WRITES] /
                             ((file->counters[CP_RW_SWITCHES] / 2) + 1);

        /* initialize the rd and wr bandwidth values using total io size and time */
        if (file->fcounters[CP_F_POSIX_READ_TIME])
            rd_bw = file->counters[CP_BYTES_READ] / file->fcounters[CP_F_POSIX_READ_TIME];
        if (file->fcounters[CP_F_POSIX_WRITE_TIME])
            wr_bw = file->counters[CP_BYTES_WRITTEN] / file->fcounters[CP_F_POSIX_WRITE_TIME];
    }

    /* loop to generate all reads/writes for this open/close sequence */
    for (i = 0; i < io_ops_this_cycle; i++)
    {
        /* calculate what value to use for i/o size and offset */
910
        determine_io_params(file, rw, 1, 1, &io_sz, &io_off);
911
912
913
        if (!rw)
        {
            /* generate a read event */
914
915
916
917
918
            next_io_op.codes_op.op_type = CODES_WK_READ;
            next_io_op.codes_op.u.read.file_id = file->hash;
            next_io_op.codes_op.u.read.size = io_sz;
            next_io_op.codes_op.u.read.offset = io_off;
            next_io_op.start_time = cur_time;
919
920
921
922
923

            /* set the end time based on observed bandwidth and io size */
            if (rd_bw == 0.0)
                io_op_time = 0.0;
            else
924
                io_op_time = (io_sz / rd_bw);
925
926
927

            /* update time, accounting for metadata time */
            cur_time += (io_op_time + meta_op_time);
928
            next_io_op.end_time = cur_time;
929
930
931
932
933
            file->counters[CP_POSIX_READS]--;
        }
        else
        {
            /* generate a write event */
934
935
936
937
938
            next_io_op.codes_op.op_type = CODES_WK_WRITE;
            next_io_op.codes_op.u.write.file_id = file->hash;
            next_io_op.codes_op.u.write.size = io_sz;
            next_io_op.codes_op.u.write.offset = io_off;
            next_io_op.start_time = cur_time;
939
940
941
942
943

            /* set the end time based on observed bandwidth and io size */
            if (wr_bw == 0.0)
                io_op_time = 0.0;
            else
944
                io_op_time = (io_sz / wr_bw);
945
946
947

            /* update time, accounting for metadata time */
            cur_time += (io_op_time + meta_op_time);
948
            next_io_op.end_time = cur_time;
949
950
951
952
953
954
955
            file->counters[CP_POSIX_WRITES]--;
        }
        psx_rw_ops_remaining--;
        io_ops_this_rw--;
        assert(file->counters[CP_POSIX_READS] >= 0);
        assert(file->counters[CP_POSIX_WRITES] >= 0);

956
957
        /* store the i/o event */
        darshan_insert_next_io_op(io_context->io_op_dat, &next_io_op);
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977

        /* determine whether to toggle between reads and writes */
        if (!io_ops_this_rw && psx_rw_ops_remaining)
        {
            /* toggle the read/write flag */
            rw ^= 1;
            file->counters[CP_RW_SWITCHES]--;

            /* determine how many io ops to do before next rw switch */
            if (!rw)
                io_ops_this_rw = file->counters[CP_POSIX_READS] /
                                 ((file->counters[CP_RW_SWITCHES] / 2) + 1);
            else
                io_ops_this_rw = file->counters[CP_POSIX_WRITES] /
                                 ((file->counters[CP_RW_SWITCHES] / 2) + 1);
        }

        if (i != (io_ops_this_cycle - 1))
        {
            /* update current time to account for possible delay between i/o operations */
978
            cur_time += inter_io_delay;
979
980
981
982
983
984
985
986
987
988
989
990
        }
    }

    /* reset the static rw flag if this is the last open-close cycle for this file */
    if (file->counters[CP_POSIX_OPENS] == 1)
    {
        rw = -1;
    }

    return cur_time;
}

991
992
static double generate_psx_coll_io_events(
    struct darshan_file *file, int64_t ind_io_ops_this_cycle, int64_t coll_io_ops_this_cycle,
993
994
    int64_t nprocs, int64_t aggregator_cnt, double inter_io_delay, double meta_op_time,
    double cur_time, struct rank_io_context *io_context)
995
996
997
998
999
1000
{
    static int rw = -1; /* rw = 1 for write, 0 for read, -1 for uninitialized */
    static int64_t io_ops_this_rw;
    static double rd_bw = 0.0, wr_bw = 0.0;
    int64_t psx_rw_ops_remaining = file->counters[CP_POSIX_READS] + file->counters[CP_POSIX_WRITES];
    int64_t total_io_ops_this_cycle = ind_io_ops_this_cycle + coll_io_ops_this_cycle;
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