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Implementing opt.background_thread.

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Added opt.background_thread to enable background threads, which handles purging
currently.  When enabled, decay ticks will not trigger purging (which will be
left to the background threads).  We limit the max number of threads to NCPUs.
When percpu arena is enabled, set CPU affinity for the background threads as
well.

The sleep interval of background threads is dynamic and determined by computing
number of pages to purge in the future (based on backlog).
This commit is contained in:
Qi Wang
2017-03-17 12:42:33 -07:00
committed by Qi Wang
parent 3f685e8824
commit b693c7868e
23 changed files with 1245 additions and 348 deletions
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6
test/unit/stats.c
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@@ -115,8 +115,10 @@ TEST_BEGIN(test_stats_arenas_summary) {
"Unexepected mallctl() result");
if (config_stats) {
assert_u64_gt(dirty_npurge + muzzy_npurge, 0,
"At least one purge should have occurred");
if (!background_thread_enabled()) {
assert_u64_gt(dirty_npurge + muzzy_npurge, 0,
"At least one purge should have occurred");
}
assert_u64_le(dirty_nmadvise, dirty_purged,
"dirty_nmadvise should be no greater than dirty_purged");
assert_u64_le(muzzy_nmadvise, muzzy_purged,