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Scripting: don't call lua_gc() after Lua script run.

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Calling lua_gc() after every script execution is too expensive, and
apparently does not make the execution smoother: the same peak latency
was measured before and after the commit.

This change accounts for scripts execution speedup in the order of 10%.
This commit is contained in:
antirez 2014-05-06 12:10:22 +02:00
parent 48c49c4851
commit 76fda9f8e1
1 changed files with 17 additions and 1 deletions
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18
src/scripting.c
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@ -943,7 +943,23 @@ void evalGenericCommand(redisClient *c, int evalsha) {
}
server.lua_caller = NULL;
selectDb(c,server.lua_client->db->id); /* set DB ID from Lua client */
lua_gc(lua,LUA_GCSTEP,1);
/* Call the Lua garbage collector from time to time to avoid a
* full cycle performed by Lua, which adds too latency.
*
* The call is performed every LUA_GC_CYCLE_PERIOD executed commands
* (and for LUA_GC_CYCLE_PERIOD collection steps) because calling it
* for every command uses too much CPU. */
#define LUA_GC_CYCLE_PERIOD 50
{
static long gc_count = 0;
gc_count++;
if (gc_count == LUA_GC_CYCLE_PERIOD) {
lua_gc(lua,LUA_GCSTEP,LUA_GC_CYCLE_PERIOD);
gc_count = 0;
}
}
if (err) {
addReplyErrorFormat(c,"Error running script (call to %s): %s\n",