Do not pre-compute the job share for each thread, and let the load
balance automatically.
/* Assign resources to worker threads*/
parmap->fun = fun;
parmap->data = data;
/* Assign resources to worker threads*/
parmap->fun = fun;
parmap->data = data;
#ifdef HAVE_FUTEX_H
xbt_event_signal(parmap->sync_event);
#endif
#ifdef HAVE_FUTEX_H
xbt_event_signal(parmap->sync_event);
#endif
static void *_xbt_parmap_worker_main(void *arg)
{
static void *_xbt_parmap_worker_main(void *arg)
{
- unsigned int data_start, data_end, data_size, worker_id;
+ unsigned int worker_id;
xbt_parmap_t parmap = (xbt_parmap_t)arg;
/* Fetch a worker id */
xbt_parmap_t parmap = (xbt_parmap_t)arg;
/* Fetch a worker id */
xbt_event_wait(parmap->sync_event);
#endif
if(parmap->status == PARMAP_WORK){
xbt_event_wait(parmap->sync_event);
#endif
if(parmap->status == PARMAP_WORK){
- XBT_DEBUG("Worker %u got a job", worker_id);
-
- /* Compute how much data does every worker gets */
- data_size = (xbt_dynar_length(parmap->data) / parmap->num_workers)
- + ((xbt_dynar_length(parmap->data) % parmap->num_workers) ? 1 : 0);
-
- /* Each worker data segment starts in a position associated with its id*/
- data_start = data_size * worker_id;
+ unsigned int i;
+ unsigned int n = 0;
- /* The end of the worker data segment must be bounded by the end of the data vector */
- data_end = MIN(data_start + data_size, xbt_dynar_length(parmap->data));
-
- XBT_DEBUG("Worker %u: data_start=%u data_end=%u (data_size=%u)",
- worker_id, data_start, data_end, data_size);
+ XBT_DEBUG("Worker %u got a job", worker_id);
- /* While the worker don't pass the end of it data segment apply the function */
- while(data_start < data_end){
- parmap->fun(*(void **)xbt_dynar_get_ptr(parmap->data, data_start));
- data_start++;
+ while ((i = __sync_fetch_and_add(&parmap->index, 1))
+ < xbt_dynar_length(parmap->data)) {
+ parmap->fun(xbt_dynar_get_as(parmap->data, i, void*));
+ n++;
+ XBT_DEBUG("Worker %u processed %u tasks", worker_id, n);
+
/* We are destroying the parmap */
}else{
#ifdef HAVE_FUTEX_H
/* We are destroying the parmap */
}else{
#ifdef HAVE_FUTEX_H
unsigned int workers_max_id;
void_f_pvoid_t fun;
xbt_dynar_t data;
unsigned int workers_max_id;
void_f_pvoid_t fun;
xbt_dynar_t data;