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OPTIM: server: start to use aligned allocs in server

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This is currently for per-thread arrays like idle conns etc. We're
now cache-aligning the per-thread arrays so as to put an end to false
sharing. A comparative test between no alignment and alignment on a
simple config with round robin between 4 servers showed an average
rate of 1.75M/s vs 1.72M/s before for 100M requests. The gain seems
to be more commonly less than 1% however. This should mostly help
make measurements more reproducible across multiple runs.
This commit is contained in:
Willy Tarreau 2025-08-11 17:43:51 +02:00
parent c2687f587e
commit 1bb9754648
1 changed files with 6 additions and 6 deletions
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12
src/server.c
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@ -3122,9 +3122,9 @@ void srv_free_params(struct server *srv)
free(srv->hostname);
free(srv->hostname_dn);
free((char*)srv->conf.file);
free(srv->per_thr);
free(srv->per_tgrp);
free(srv->curr_idle_thr);
ha_aligned_free(srv->per_thr);
ha_aligned_free(srv->per_tgrp);
ha_aligned_free(srv->curr_idle_thr);
free(srv->pool_conn_name);
release_sample_expr(srv->pool_conn_name_expr);
free(srv->resolvers_id);
@ -3482,7 +3482,7 @@ int srv_init(struct server *srv)
/* initialize idle conns lists */
if (srv->max_idle_conns != 0) {
srv->curr_idle_thr = calloc(global.nbthread, sizeof(*srv->curr_idle_thr));
srv->curr_idle_thr = ha_aligned_zalloc(64, global.nbthread * sizeof(*srv->curr_idle_thr));
if (!srv->curr_idle_thr) {
ha_alert("memory error during idle conn list init for %s/%s server\n",
srv->proxy->id, srv->id);
@ -5918,8 +5918,8 @@ static int srv_init_per_thr(struct server *srv)
{
int i;
srv->per_thr = calloc(global.nbthread, sizeof(*srv->per_thr));
srv->per_tgrp = calloc(global.nbtgroups, sizeof(*srv->per_tgrp));
srv->per_thr = ha_aligned_zalloc(64, global.nbthread * sizeof(*srv->per_thr));
srv->per_tgrp = ha_aligned_zalloc(64, global.nbtgroups * sizeof(*srv->per_tgrp));
if (!srv->per_thr || !srv->per_tgrp)
return -1;