static void _compute_start_times(void)
{
int j, rc = SLURM_SUCCESS, job_cnt = 0;
List job_queue;
job_queue_rec_t *job_queue_rec;
List preemptee_candidates = NULL;
struct job_record *job_ptr;
struct part_record *part_ptr;
bitstr_t *alloc_bitmap = NULL, *avail_bitmap = NULL;
bitstr_t *exc_core_bitmap = NULL;
uint32_t max_nodes, min_nodes, req_nodes, time_limit;
time_t now = time(NULL), sched_start, last_job_alloc;
bool resv_overlap = false;
sched_start = now;
last_job_alloc = now - 1;
alloc_bitmap = bit_alloc(node_record_count);
job_queue = build_job_queue(true, false);
sort_job_queue(job_queue);
while ((job_queue_rec = (job_queue_rec_t *) list_pop(job_queue))) {
job_ptr = job_queue_rec->job_ptr;
part_ptr = job_queue_rec->part_ptr;
xfree(job_queue_rec);
if (part_ptr != job_ptr->part_ptr)
continue; /* Only test one partition */
if (job_cnt++ > max_sched_job_cnt) {
debug2("scheduling loop exiting after %d jobs",
max_sched_job_cnt);
break;
}
/* Determine minimum and maximum node counts */
/* On BlueGene systems don't adjust the min/max node limits
here. We are working on midplane values. */
min_nodes = MAX(job_ptr->details->min_nodes,
part_ptr->min_nodes);
if (job_ptr->details->max_nodes == 0)
max_nodes = part_ptr->max_nodes;
else
max_nodes = MIN(job_ptr->details->max_nodes,
part_ptr->max_nodes);
max_nodes = MIN(max_nodes, 500000); /* prevent overflows */
if (job_ptr->details->max_nodes)
req_nodes = max_nodes;
else
req_nodes = min_nodes;
if (min_nodes > max_nodes) {
/* job's min_nodes exceeds partition's max_nodes */
continue;
}
j = job_test_resv(job_ptr, &now, true, &avail_bitmap,
&exc_core_bitmap, &resv_overlap, false);
if (j != SLURM_SUCCESS) {
FREE_NULL_BITMAP(avail_bitmap);
FREE_NULL_BITMAP(exc_core_bitmap);
continue;
}
rc = select_g_job_test(job_ptr, avail_bitmap,
min_nodes, max_nodes, req_nodes,
SELECT_MODE_WILL_RUN,
preemptee_candidates, NULL,
exc_core_bitmap);
if (rc == SLURM_SUCCESS) {
last_job_update = now;
if (job_ptr->time_limit == INFINITE)
time_limit = 365 * 24 * 60 * 60;
else if (job_ptr->time_limit != NO_VAL)
time_limit = job_ptr->time_limit * 60;
else if (job_ptr->part_ptr &&
(job_ptr->part_ptr->max_time != INFINITE))
time_limit = job_ptr->part_ptr->max_time * 60;
else
time_limit = 365 * 24 * 60 * 60;
if (bit_overlap(alloc_bitmap, avail_bitmap) &&
(job_ptr->start_time <= last_job_alloc)) {
job_ptr->start_time = last_job_alloc;
}
bit_or(alloc_bitmap, avail_bitmap);
last_job_alloc = job_ptr->start_time + time_limit;
}
FREE_NULL_BITMAP(avail_bitmap);
FREE_NULL_BITMAP(exc_core_bitmap);
if ((time(NULL) - sched_start) >= sched_timeout) {
debug2("scheduling loop exiting after %d jobs",
max_sched_job_cnt);
break;
}
}
FREE_NULL_LIST(job_queue);
FREE_NULL_BITMAP(alloc_bitmap);
}
static int _attempt_backfill(void)
{
DEF_TIMERS;
bool filter_root = false;
List job_queue;
job_queue_rec_t *job_queue_rec;
slurmdb_qos_rec_t *qos_ptr = NULL;
int i, j, node_space_recs;
struct job_record *job_ptr;
struct part_record *part_ptr, **bf_part_ptr = NULL;
uint32_t end_time, end_reserve;
uint32_t time_limit, comp_time_limit, orig_time_limit, part_time_limit;
uint32_t min_nodes, max_nodes, req_nodes;
bitstr_t *avail_bitmap = NULL, *resv_bitmap = NULL;
bitstr_t *exc_core_bitmap = NULL, *non_cg_bitmap = NULL;
bitstr_t *previous_bitmap = NULL;
time_t now, sched_start, later_start, start_res, resv_end;
node_space_map_t *node_space;
struct timeval bf_time1, bf_time2;
int rc = 0;
int job_test_count = 0;
uint32_t *uid = NULL, nuser = 0, bf_parts = 0, *bf_part_jobs = NULL;
uint16_t *njobs = NULL;
bool already_counted;
uint32_t reject_array_job_id = 0;
struct part_record *reject_array_part = NULL;
uint32_t job_start_cnt = 0;
time_t config_update = slurmctld_conf.last_update;
time_t part_update = last_part_update;
struct timeval start_tv;
bf_last_yields = 0;
#ifdef HAVE_ALPS_CRAY
/*
* Run a Basil Inventory immediately before setting up the schedule
* plan, to avoid race conditions caused by ALPS node state change.
* Needs to be done with the node-state lock taken.
*/
START_TIMER;
if (select_g_reconfigure()) {
debug4("backfill: not scheduling due to ALPS");
return SLURM_SUCCESS;
}
END_TIMER;
if (debug_flags & DEBUG_FLAG_BACKFILL)
info("backfill: ALPS inventory completed, %s", TIME_STR);
/* The Basil inventory can take a long time to complete. Process
* pending RPCs before starting the backfill scheduling logic */
_yield_locks(1000000);
#endif
START_TIMER;
if (debug_flags & DEBUG_FLAG_BACKFILL)
info("backfill: beginning");
else
debug("backfill: beginning");
sched_start = now = time(NULL);
gettimeofday(&start_tv, NULL);
if (slurm_get_root_filter())
filter_root = true;
job_queue = build_job_queue(true, true);
if (list_count(job_queue) == 0) {
debug("backfill: no jobs to backfill");
list_destroy(job_queue);
return 0;
}
gettimeofday(&bf_time1, NULL);
non_cg_bitmap = bit_copy(cg_node_bitmap);
bit_not(non_cg_bitmap);
slurmctld_diag_stats.bf_queue_len = list_count(job_queue);
slurmctld_diag_stats.bf_queue_len_sum += slurmctld_diag_stats.
bf_queue_len;
slurmctld_diag_stats.bf_last_depth = 0;
slurmctld_diag_stats.bf_last_depth_try = 0;
slurmctld_diag_stats.bf_when_last_cycle = now;
slurmctld_diag_stats.bf_active = 1;
node_space = xmalloc(sizeof(node_space_map_t) *
(max_backfill_job_cnt * 2 + 1));
node_space[0].begin_time = sched_start;
node_space[0].end_time = sched_start + backfill_window;
node_space[0].avail_bitmap = bit_copy(avail_node_bitmap);
node_space[0].next = 0;
node_space_recs = 1;
if (debug_flags & DEBUG_FLAG_BACKFILL)
_dump_node_space_table(node_space);
if (max_backfill_job_per_part) {
ListIterator part_iterator;
struct part_record *part_ptr;
bf_parts = list_count(part_list);
bf_part_ptr = xmalloc(sizeof(struct part_record *) * bf_parts);
bf_part_jobs = xmalloc(sizeof(int) * bf_parts);
part_iterator = list_iterator_create(part_list);
i = 0;
while ((part_ptr = (struct part_record *)
list_next(part_iterator))) {
bf_part_ptr[i++] = part_ptr;
}
list_iterator_destroy(part_iterator);
}
if (max_backfill_job_per_user) {
uid = xmalloc(BF_MAX_USERS * sizeof(uint32_t));
njobs = xmalloc(BF_MAX_USERS * sizeof(uint16_t));
}
sort_job_queue(job_queue);
while ((job_queue_rec = (job_queue_rec_t *) list_pop(job_queue))) {
if (slurmctld_config.shutdown_time)
break;
if (((defer_rpc_cnt > 0) &&
(slurmctld_config.server_thread_count >= defer_rpc_cnt)) ||
(_delta_tv(&start_tv) >= sched_timeout)) {
if (debug_flags & DEBUG_FLAG_BACKFILL) {
END_TIMER;
info("backfill: completed yielding locks "
"after testing %d jobs, %s",
job_test_count, TIME_STR);
}
if ((_yield_locks(yield_sleep) && !backfill_continue) ||
(slurmctld_conf.last_update != config_update) ||
(last_part_update != part_update)) {
if (debug_flags & DEBUG_FLAG_BACKFILL) {
info("backfill: system state changed, "
"breaking out after testing %d "
"jobs", job_test_count);
}
rc = 1;
xfree(job_queue_rec);
break;
}
/* cg_node_bitmap may be changed */
bit_copybits(non_cg_bitmap, cg_node_bitmap);
bit_not(non_cg_bitmap);
/* Reset backfill scheduling timers, resume testing */
sched_start = time(NULL);
gettimeofday(&start_tv, NULL);
job_test_count = 0;
START_TIMER;
}
job_ptr = job_queue_rec->job_ptr;
/* With bf_continue configured, the original job could have
* been cancelled and purged. Validate pointer here. */
if ((job_ptr->magic != JOB_MAGIC) ||
(job_ptr->job_id != job_queue_rec->job_id)) {
xfree(job_queue_rec);
continue;
}
orig_time_limit = job_ptr->time_limit;
part_ptr = job_queue_rec->part_ptr;
job_test_count++;
xfree(job_queue_rec);
if (!IS_JOB_PENDING(job_ptr))
continue; /* started in other partition */
if (!avail_front_end(job_ptr))
continue; /* No available frontend for this job */
if (job_ptr->array_task_id != NO_VAL) {
if ((reject_array_job_id == job_ptr->array_job_id) &&
(reject_array_part == part_ptr))
continue; /* already rejected array element */
/* assume reject whole array for now, clear if OK */
reject_array_job_id = job_ptr->array_job_id;
reject_array_part = part_ptr;
}
job_ptr->part_ptr = part_ptr;
if (debug_flags & DEBUG_FLAG_BACKFILL)
info("backfill test for job %u", job_ptr->job_id);
slurmctld_diag_stats.bf_last_depth++;
already_counted = false;
if (max_backfill_job_per_part) {
bool skip_job = false;
for (j = 0; j < bf_parts; j++) {
if (bf_part_ptr[j] != job_ptr->part_ptr)
continue;
if (bf_part_jobs[j]++ >=
max_backfill_job_per_part)
skip_job = true;
break;
}
if (skip_job) {
if (debug_flags & DEBUG_FLAG_BACKFILL)
debug("backfill: have already "
"checked %u jobs for "
"partition %s; skipping "
"job %u",
max_backfill_job_per_part,
job_ptr->part_ptr->name,
job_ptr->job_id);
continue;
}
}
if (max_backfill_job_per_user) {
for (j = 0; j < nuser; j++) {
if (job_ptr->user_id == uid[j]) {
njobs[j]++;
if (debug_flags & DEBUG_FLAG_BACKFILL)
debug("backfill: user %u: "
"#jobs %u",
uid[j], njobs[j]);
break;
}
}
if (j == nuser) { /* user not found */
static bool bf_max_user_msg = true;
if (nuser < BF_MAX_USERS) {
uid[j] = job_ptr->user_id;
njobs[j] = 1;
nuser++;
} else if (bf_max_user_msg) {
bf_max_user_msg = false;
error("backfill: too many users in "
"queue. Consider increasing "
"BF_MAX_USERS");
}
if (debug_flags & DEBUG_FLAG_BACKFILL)
debug2("backfill: found new user %u. "
"Total #users now %u",
job_ptr->user_id, nuser);
} else {
if (njobs[j] >= max_backfill_job_per_user) {
/* skip job */
if (debug_flags & DEBUG_FLAG_BACKFILL)
debug("backfill: have already "
"checked %u jobs for "
"user %u; skipping "
"job %u",
max_backfill_job_per_user,
job_ptr->user_id,
job_ptr->job_id);
continue;
}
}
}
if (((part_ptr->state_up & PARTITION_SCHED) == 0) ||
(part_ptr->node_bitmap == NULL))
continue;
if ((part_ptr->flags & PART_FLAG_ROOT_ONLY) && filter_root)
continue;
if ((!job_independent(job_ptr, 0)) ||
(license_job_test(job_ptr, time(NULL)) != SLURM_SUCCESS))
continue;
/* Determine minimum and maximum node counts */
min_nodes = MAX(job_ptr->details->min_nodes,
part_ptr->min_nodes);
if (job_ptr->details->max_nodes == 0)
max_nodes = part_ptr->max_nodes;
else
max_nodes = MIN(job_ptr->details->max_nodes,
part_ptr->max_nodes);
max_nodes = MIN(max_nodes, 500000); /* prevent overflows */
if (job_ptr->details->max_nodes)
req_nodes = max_nodes;
else
req_nodes = min_nodes;
if (min_nodes > max_nodes) {
/* job's min_nodes exceeds partition's max_nodes */
continue;
}
/* Determine job's expected completion time */
if (part_ptr->max_time == INFINITE)
part_time_limit = 365 * 24 * 60; /* one year */
else
part_time_limit = part_ptr->max_time;
if (job_ptr->time_limit == NO_VAL) {
time_limit = part_time_limit;
} else {
if (part_ptr->max_time == INFINITE)
time_limit = job_ptr->time_limit;
else
time_limit = MIN(job_ptr->time_limit,
part_time_limit);
}
comp_time_limit = time_limit;
qos_ptr = job_ptr->qos_ptr;
if (qos_ptr && (qos_ptr->flags & QOS_FLAG_NO_RESERVE) &&
slurm_get_preempt_mode())
time_limit = job_ptr->time_limit = 1;
else if (job_ptr->time_min && (job_ptr->time_min < time_limit))
time_limit = job_ptr->time_limit = job_ptr->time_min;
/* Determine impact of any resource reservations */
later_start = now;
FREE_NULL_BITMAP(previous_bitmap);
TRY_LATER:
if (slurmctld_config.shutdown_time)
break;
if (((defer_rpc_cnt > 0) &&
(slurmctld_config.server_thread_count >= defer_rpc_cnt)) ||
(_delta_tv(&start_tv) >= sched_timeout)) {
uint32_t save_job_id = job_ptr->job_id;
uint32_t save_time_limit = job_ptr->time_limit;
job_ptr->time_limit = orig_time_limit;
if (debug_flags & DEBUG_FLAG_BACKFILL) {
END_TIMER;
info("backfill: completed yielding locks "
"after testing %d jobs, %s",
job_test_count, TIME_STR);
}
if ((_yield_locks(yield_sleep) && !backfill_continue) ||
(slurmctld_conf.last_update != config_update) ||
(last_part_update != part_update)) {
if (debug_flags & DEBUG_FLAG_BACKFILL) {
info("backfill: system state changed, "
"breaking out after testing %d "
"jobs", job_test_count);
}
rc = 1;
break;
}
/* cg_node_bitmap may be changed */
bit_copybits(non_cg_bitmap, cg_node_bitmap);
bit_not(non_cg_bitmap);
/* With bf_continue configured, the original job could
* have been scheduled or cancelled and purged.
* Revalidate job the record here. */
if ((job_ptr->magic != JOB_MAGIC) ||
(job_ptr->job_id != save_job_id))
continue;
if (!IS_JOB_PENDING(job_ptr))
continue;
if (!avail_front_end(job_ptr))
continue; /* No available frontend */
job_ptr->time_limit = save_time_limit;
/* Reset backfill scheduling timers, resume testing */
sched_start = time(NULL);
gettimeofday(&start_tv, NULL);
job_test_count = 1;
START_TIMER;
}
FREE_NULL_BITMAP(avail_bitmap);
FREE_NULL_BITMAP(exc_core_bitmap);
start_res = later_start;
later_start = 0;
j = job_test_resv(job_ptr, &start_res, true, &avail_bitmap,
&exc_core_bitmap);
if (j != SLURM_SUCCESS) {
job_ptr->time_limit = orig_time_limit;
continue;
}
if (start_res > now)
end_time = (time_limit * 60) + start_res;
else
end_time = (time_limit * 60) + now;
resv_end = find_resv_end(start_res);
/* Identify usable nodes for this job */
bit_and(avail_bitmap, part_ptr->node_bitmap);
bit_and(avail_bitmap, up_node_bitmap);
bit_and(avail_bitmap, non_cg_bitmap);
for (j=0; ; ) {
if ((node_space[j].end_time > start_res) &&
node_space[j].next && (later_start == 0))
later_start = node_space[j].end_time;
if (node_space[j].end_time <= start_res)
;
else if (node_space[j].begin_time <= end_time) {
bit_and(avail_bitmap,
node_space[j].avail_bitmap);
} else
break;
if ((j = node_space[j].next) == 0)
break;
}
if ((resv_end++) &&
((later_start == 0) || (resv_end < later_start))) {
later_start = resv_end;
}
if (job_ptr->details->exc_node_bitmap) {
bit_not(job_ptr->details->exc_node_bitmap);
bit_and(avail_bitmap,
job_ptr->details->exc_node_bitmap);
bit_not(job_ptr->details->exc_node_bitmap);
}
/* Test if insufficient nodes remain OR
* required nodes missing OR
* nodes lack features OR
* no change since previously tested nodes (only changes
* in other partition nodes) */
if ((bit_set_count(avail_bitmap) < min_nodes) ||
((job_ptr->details->req_node_bitmap) &&
(!bit_super_set(job_ptr->details->req_node_bitmap,
avail_bitmap))) ||
(job_req_node_filter(job_ptr, avail_bitmap)) ||
(previous_bitmap &&
bit_equal(previous_bitmap, avail_bitmap))) {
if (later_start) {
job_ptr->start_time = 0;
goto TRY_LATER;
}
/* Job can not start until too far in the future */
job_ptr->time_limit = orig_time_limit;
job_ptr->start_time = sched_start + backfill_window;
continue;
}
FREE_NULL_BITMAP(previous_bitmap);
previous_bitmap = bit_copy(avail_bitmap);
/* Identify nodes which are definitely off limits */
FREE_NULL_BITMAP(resv_bitmap);
resv_bitmap = bit_copy(avail_bitmap);
bit_not(resv_bitmap);
/* this is the time consuming operation */
debug2("backfill: entering _try_sched for job %u.",
job_ptr->job_id);
if (!already_counted) {
slurmctld_diag_stats.bf_last_depth_try++;
already_counted = true;
}
if (debug_flags & DEBUG_FLAG_BACKFILL)
_dump_job_test(job_ptr, avail_bitmap, start_res);
j = _try_sched(job_ptr, &avail_bitmap, min_nodes, max_nodes,
req_nodes, exc_core_bitmap);
now = time(NULL);
if (j != SLURM_SUCCESS) {
job_ptr->time_limit = orig_time_limit;
job_ptr->start_time = 0;
continue; /* not runable */
}
if (start_res > job_ptr->start_time) {
job_ptr->start_time = start_res;
last_job_update = now;
}
if (job_ptr->start_time <= now) {
uint32_t save_time_limit = job_ptr->time_limit;
int rc = _start_job(job_ptr, resv_bitmap);
if (qos_ptr && (qos_ptr->flags & QOS_FLAG_NO_RESERVE)) {
if (orig_time_limit == NO_VAL) {
acct_policy_alter_job(
job_ptr, comp_time_limit);
job_ptr->time_limit = comp_time_limit;
} else {
acct_policy_alter_job(
job_ptr, orig_time_limit);
job_ptr->time_limit = orig_time_limit;
}
job_ptr->end_time = job_ptr->start_time +
(job_ptr->time_limit * 60);
} else if ((rc == SLURM_SUCCESS) && job_ptr->time_min) {
/* Set time limit as high as possible */
acct_policy_alter_job(job_ptr, comp_time_limit);
job_ptr->time_limit = comp_time_limit;
job_ptr->end_time = job_ptr->start_time +
(comp_time_limit * 60);
_reset_job_time_limit(job_ptr, now,
node_space);
time_limit = job_ptr->time_limit;
} else if (orig_time_limit == NO_VAL) {
acct_policy_alter_job(job_ptr, comp_time_limit);
job_ptr->time_limit = comp_time_limit;
job_ptr->end_time = job_ptr->start_time +
(job_ptr->time_limit * 60);
} else {
acct_policy_alter_job(job_ptr, orig_time_limit);
job_ptr->time_limit = orig_time_limit;
job_ptr->end_time = job_ptr->start_time +
(job_ptr->time_limit * 60);
}
if (rc == ESLURM_ACCOUNTING_POLICY) {
/* Unknown future start time, just skip job */
job_ptr->start_time = 0;
continue;
} else if (rc != SLURM_SUCCESS) {
/* Planned to start job, but something bad
* happened. */
job_ptr->start_time = 0;
break;
} else {
/* Started this job, move to next one */
reject_array_job_id = 0;
reject_array_part = NULL;
/* Update the database if job time limit
* changed and move to next job */
if (save_time_limit != job_ptr->time_limit)
jobacct_storage_g_job_start(acct_db_conn,
job_ptr);
if (max_backfill_jobs_start &&
(++job_start_cnt >= max_backfill_jobs_start))
break;
continue;
}
} else
job_ptr->time_limit = orig_time_limit;
if (later_start && (job_ptr->start_time > later_start)) {
/* Try later when some nodes currently reserved for
* pending jobs are free */
job_ptr->start_time = 0;
goto TRY_LATER;
}
if (job_ptr->start_time > (sched_start + backfill_window)) {
/* Starts too far in the future to worry about */
continue;
}
if (node_space_recs >= max_backfill_job_cnt) {
/* Already have too many jobs to deal with */
break;
}
end_reserve = job_ptr->start_time + (time_limit * 60);
if (_test_resv_overlap(node_space, avail_bitmap,
job_ptr->start_time, end_reserve)) {
/* This job overlaps with an existing reservation for
* job to be backfill scheduled, which the sched
* plugin does not know about. Try again later. */
later_start = job_ptr->start_time;
job_ptr->start_time = 0;
goto TRY_LATER;
}
/*
* Add reservation to scheduling table if appropriate
*/
if (qos_ptr && (qos_ptr->flags & QOS_FLAG_NO_RESERVE))
continue;
reject_array_job_id = 0;
reject_array_part = NULL;
if (debug_flags & DEBUG_FLAG_BACKFILL)
_dump_job_sched(job_ptr, end_reserve, avail_bitmap);
xfree(job_ptr->sched_nodes);
job_ptr->sched_nodes = bitmap2node_name(avail_bitmap);
bit_not(avail_bitmap);
_add_reservation(job_ptr->start_time, end_reserve,
avail_bitmap, node_space, &node_space_recs);
if (debug_flags & DEBUG_FLAG_BACKFILL)
_dump_node_space_table(node_space);
}
xfree(bf_part_jobs);
xfree(bf_part_ptr);
xfree(uid);
xfree(njobs);
FREE_NULL_BITMAP(avail_bitmap);
FREE_NULL_BITMAP(exc_core_bitmap);
FREE_NULL_BITMAP(resv_bitmap);
FREE_NULL_BITMAP(non_cg_bitmap);
FREE_NULL_BITMAP(previous_bitmap);
for (i=0; ; ) {
FREE_NULL_BITMAP(node_space[i].avail_bitmap);
if ((i = node_space[i].next) == 0)
break;
}
xfree(node_space);
list_destroy(job_queue);
gettimeofday(&bf_time2, NULL);
_do_diag_stats(&bf_time1, &bf_time2, yield_sleep);
if (debug_flags & DEBUG_FLAG_BACKFILL) {
END_TIMER;
info("backfill: completed testing %d jobs, %s",
job_test_count, TIME_STR);
}
return rc;
}