double _starpu_history_based_job_expected_length(struct starpu_perfmodel_t *model, enum starpu_perf_archtype arch, struct starpu_job_s *j)
{
double exp;
struct starpu_per_arch_perfmodel_t *per_arch_model;
struct starpu_history_entry_t *entry;
struct starpu_htbl32_node_s *history;
load_history_based_model(model, 1);
if (STARPU_UNLIKELY(!j->footprint_is_computed))
_starpu_compute_buffers_footprint(j);
uint32_t key = j->footprint;
per_arch_model = &model->per_arch[arch];
history = per_arch_model->history;
if (!history)
return -1.0;
PTHREAD_RWLOCK_RDLOCK(&model->model_rwlock);
entry = _starpu_htbl_search_32(history, key);
PTHREAD_RWLOCK_UNLOCK(&model->model_rwlock);
exp = entry?entry->mean:-1.0;
return exp;
}
cache_inode_status_t
cache_inode_readlink(cache_entry_t *entry,
fsal_path_t *link_content,
fsal_op_context_t *context,
cache_inode_status_t *status)
{
fsal_status_t fsal_status = {0, 0};
/* Set the return default to CACHE_INODE_SUCCESS */
*status = CACHE_INODE_SUCCESS;
if (entry->type != SYMBOLIC_LINK) {
*status = CACHE_INODE_BAD_TYPE;
return *status;
}
assert(entry->object.symlink);
PTHREAD_RWLOCK_RDLOCK(&entry->content_lock);
if (!(entry->flags & CACHE_INODE_TRUST_CONTENT)) {
/* Our data are stale. Drop the lock, get a
write-lock, load in new data, and copy it out to
the caller. */
PTHREAD_RWLOCK_UNLOCK(&entry->content_lock);
PTHREAD_RWLOCK_WRLOCK(&entry->content_lock);
/* Make sure nobody updated the content while we were
waiting. */
if (!(entry->flags & CACHE_INODE_TRUST_CONTENT)) {
fsal_status
= FSAL_readlink(&entry->handle,
context,
&entry->object.symlink->content,
NULL);
if (!(FSAL_IS_ERROR(fsal_status))) {
atomic_set_uint32_t_bits(&entry->flags,
CACHE_INODE_TRUST_CONTENT);
}
}
}
if (!(FSAL_IS_ERROR(fsal_status))) {
FSAL_pathcpy(link_content,
&(entry->object.symlink->content));
}
PTHREAD_RWLOCK_UNLOCK(&entry->content_lock);
if (FSAL_IS_ERROR(fsal_status)) {
*status = cache_inode_error_convert(fsal_status);
if (fsal_status.major == ERR_FSAL_STALE) {
LogEvent(COMPONENT_CACHE_INODE,
"FSAL returned STALE from readlink");
cache_inode_kill_entry(entry);
}
return *status;
}
return *status;
} /* cache_inode_readlink */
void starpu_wake_all_blocked_workers(void)
{
/* workers may be blocked on the various queues' conditions */
unsigned cond_id;
starpu_mem_node_descr * const descr = _starpu_get_memory_node_description();
PTHREAD_RWLOCK_RDLOCK(&descr->conditions_rwlock);
unsigned nconds = descr->total_condition_count;
for (cond_id = 0; cond_id < nconds; cond_id++)
{
struct _cond_and_mutex *condition;
condition = &descr->conditions_all[cond_id];
/* wake anybody waiting on that condition */
PTHREAD_MUTEX_LOCK(condition->mutex);
PTHREAD_COND_BROADCAST(condition->cond);
PTHREAD_MUTEX_UNLOCK(condition->mutex);
}
PTHREAD_RWLOCK_UNLOCK(&descr->conditions_rwlock);
}
void _starpu_wake_all_blocked_workers_on_node(unsigned nodeid)
{
/* wake up all workers on that memory node */
unsigned cond_id;
starpu_mem_node_descr * const descr = _starpu_get_memory_node_description();
PTHREAD_RWLOCK_RDLOCK(&descr->conditions_rwlock);
unsigned nconds = descr->condition_count[nodeid];
for (cond_id = 0; cond_id < nconds; cond_id++)
{
struct _cond_and_mutex *condition;
condition = &descr->conditions_attached_to_node[nodeid][cond_id];
/* wake anybody waiting on that condition */
PTHREAD_MUTEX_LOCK(condition->mutex);
PTHREAD_COND_BROADCAST(condition->cond);
PTHREAD_MUTEX_UNLOCK(condition->mutex);
}
PTHREAD_RWLOCK_UNLOCK(&descr->conditions_rwlock);
}
/* We first try to grab the global lock in read mode to check whether the model
* was loaded or not (this is very likely to have been already loaded). If the
* model was not loaded yet, we take the lock in write mode, and if the model
* is still not loaded once we have the lock, we do load it. */
static void load_history_based_model(struct starpu_perfmodel_t *model, unsigned scan_history)
{
STARPU_ASSERT(model);
STARPU_ASSERT(model->symbol);
int already_loaded;
PTHREAD_RWLOCK_RDLOCK(®istered_models_rwlock);
already_loaded = model->is_loaded;
PTHREAD_RWLOCK_UNLOCK(®istered_models_rwlock);
if (already_loaded)
return;
/* The model is still not loaded so we grab the lock in write mode, and
* if it's not loaded once we have the lock, we do load it. */
PTHREAD_RWLOCK_WRLOCK(®istered_models_rwlock);
/* Was the model initialized since the previous test ? */
if (model->is_loaded)
{
PTHREAD_RWLOCK_UNLOCK(®istered_models_rwlock);
return;
}
PTHREAD_RWLOCK_INIT(&model->model_rwlock, NULL);
PTHREAD_RWLOCK_WRLOCK(&model->model_rwlock);
/* make sure the performance model directory exists (or create it) */
_starpu_create_sampling_directory_if_needed();
/*
* We need to keep track of all the model that were opened so that we can
* possibly update them at runtime termination ...
*/
_starpu_register_model(model);
char path[256];
get_model_path(model, path, 256);
_STARPU_DEBUG("Opening performance model file %s for model %s ... ", path, model->symbol);
unsigned calibrate_flag = _starpu_get_calibrate_flag();
model->benchmarking = calibrate_flag;
/* try to open an existing file and load it */
int res;
res = access(path, F_OK);
if (res == 0) {
if (calibrate_flag == 2)
{
/* The user specified that the performance model should
* be overwritten, so we don't load the existing file !
* */
_STARPU_DEBUG("Overwrite existing file\n");
initialize_model(model);
}
else {
/* We load the available file */
_STARPU_DEBUG("File exists\n");
FILE *f;
f = fopen(path, "r");
STARPU_ASSERT(f);
parse_model_file(f, model, scan_history);
fclose(f);
}
}
else {
_STARPU_DEBUG("File does not exists\n");
if (!calibrate_flag) {
_STARPU_DISP("Warning: model %s is not calibrated, forcing calibration for this run. Use the STARPU_CALIBRATE environment variable to control this.\n", model->symbol);
_starpu_set_calibrate_flag(1);
model->benchmarking = 1;
}
initialize_model(model);
}
model->is_loaded = 1;
PTHREAD_RWLOCK_UNLOCK(&model->model_rwlock);
PTHREAD_RWLOCK_UNLOCK(®istered_models_rwlock);
}