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threading: support for GGML_SCHED_PRIO_LOW, update thread info on Windows to avoid throttling

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We talked about adding LOW priority for GGML threads in the original threadpool PR.
It might be useful for some cases to avoid contention.

Latest Windows ARM64 releases started parking (offlining) the CPU cores
more aggresively which results in suboptimal performance with n_threads > 4.
To deal with that we now disable Power Throttling for our threads for the NORMAL
and higher priorities.

Co-authored-by: Diego Devesa <slarengh@gmail.com>
This commit is contained in:
Max Krasnyansky
2025-04-17 14:13:29 -07:00
parent e562eece7c
commit 199a838422
5 changed files with 27 additions and 3 deletions
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2
common/common.cpp
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@ -203,6 +203,7 @@ bool set_process_priority(enum ggml_sched_priority prio) {
DWORD p = NORMAL_PRIORITY_CLASS;
switch (prio) {
case GGML_SCHED_PRIO_LOW: p = BELOW_NORMAL_PRIORITY_CLASS; break;
case GGML_SCHED_PRIO_NORMAL: p = NORMAL_PRIORITY_CLASS; break;
case GGML_SCHED_PRIO_MEDIUM: p = ABOVE_NORMAL_PRIORITY_CLASS; break;
case GGML_SCHED_PRIO_HIGH: p = HIGH_PRIORITY_CLASS; break;
@ -228,6 +229,7 @@ bool set_process_priority(enum ggml_sched_priority prio) {
int p = 0;
switch (prio) {
case GGML_SCHED_PRIO_LOW: p = 5; break;
case GGML_SCHED_PRIO_NORMAL: p = 0; break;
case GGML_SCHED_PRIO_MEDIUM: p = -5; break;
case GGML_SCHED_PRIO_HIGH: p = -10; break;