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make redis purge jemalloc after flush, and enable background purging thread

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jemalloc 5 doesn't immediately release memory back to the OS, instead there's a decaying
mechanism, which doesn't work when there's no traffic (no allocations).
this is most evident if there's no traffic after flushdb, the RSS will remain high.

1) enable jemalloc background purging
2) explicitly purge in flushdb
This commit is contained in:
Oran Agra
2019-05-30 12:51:32 +03:00
parent 2fec7d9c6c
commit 09f99c2a92
7 changed files with 124 additions and 0 deletions
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2
src/server.c
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@ -2230,6 +2230,7 @@ void initServerConfig(void) {
server.maxidletime = CONFIG_DEFAULT_CLIENT_TIMEOUT;
server.tcpkeepalive = CONFIG_DEFAULT_TCP_KEEPALIVE;
server.active_expire_enabled = 1;
server.jemalloc_bg_thread = 1;
server.active_defrag_enabled = CONFIG_DEFAULT_ACTIVE_DEFRAG;
server.active_defrag_ignore_bytes = CONFIG_DEFAULT_DEFRAG_IGNORE_BYTES;
server.active_defrag_threshold_lower = CONFIG_DEFAULT_DEFRAG_THRESHOLD_LOWER;
@ -2866,6 +2867,7 @@ void initServer(void) {
latencyMonitorInit();
bioInit();
initThreadedIO();
set_jemalloc_bg_thread(server.jemalloc_bg_thread);
server.initial_memory_usage = zmalloc_used_memory();
}