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Add per-thread sharded histograms for heavy loads

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Although an `isc_histo_t` is thread-safe, it can suffer
from cache contention under heavy load. To avoid this,
an `isc_histomulti_t` contains a histogram per thread,
so updates are local and low-contention.
This commit is contained in:
Tony Finch
2023-03-16 09:46:15 +00:00
committed by Tony Finch
parent 82213a48cf
commit bc2389b828
5 changed files with 177 additions and 6 deletions
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1
lib/isc/loop.c
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@@ -346,6 +346,7 @@ isc_loopmgr_create(isc_mem_t *mctx, uint32_t nloops, isc_loopmgr_t **loopmgrp) {
REQUIRE(nloops > 0);
threadpool_initialize(nloops);
isc__tid_initcount(nloops);
loopmgr = isc_mem_get(mctx, sizeof(*loopmgr));
*loopmgr = (isc_loopmgr_t){