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Reduce rewriteClientCommandVector usage on EXPIRE command (#11602)

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There is overhead on Redis 7.0 EXPIRE command that is not present on 6.2.7. 

We could see that on the unstable profile there are around 7% of CPU cycles
spent on rewriteClientCommandVector that are not present on 6.2.7.
This was introduced in #8474.
This PR reduces the overhead by using 2X rewriteClientCommandArgument instead of
rewriteClientCommandVector. In this scenario rewriteClientCommandVector creates 4 arguments.
the above usage of rewriteClientCommandArgument reduces the overhead in half.

This PR should also improve PEXPIREAT performance by avoiding at all
rewriteClientCommandArgument usage. 

Co-authored-by: Oran Agra <oran@redislabs.com>
This commit is contained in:
filipe oliveira 2022-12-09 10:06:25 +00:00 committed by GitHub
parent 10e4f44dc2
commit c3fb48da8b
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1 changed files with 13 additions and 4 deletions
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17
src/expire.c
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@ -651,10 +651,19 @@ void expireGenericCommand(client *c, long long basetime, int unit) {
} else {
setExpire(c,c->db,key,when);
addReply(c,shared.cone);
/* Propagate as PEXPIREAT millisecond-timestamp */
robj *when_obj = createStringObjectFromLongLong(when);
rewriteClientCommandVector(c, 3, shared.pexpireat, key, when_obj);
decrRefCount(when_obj);
/* Propagate as PEXPIREAT millisecond-timestamp
* Only rewrite the command arg if not already PEXPIREAT */
if (c->cmd->proc != pexpireatCommand) {
rewriteClientCommandArgument(c,0,shared.pexpireat);
}
/* Avoid creating a string object when it's the same as argv[2] parameter */
if (basetime != 0 || unit == UNIT_SECONDS) {
robj *when_obj = createStringObjectFromLongLong(when);
rewriteClientCommandArgument(c,2,when_obj);
decrRefCount(when_obj);
}
signalModifiedKey(c,c->db,key);
notifyKeyspaceEvent(NOTIFY_GENERIC,"expire",key,c->db->id);
server.dirty++;