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Cache uname() output across INFO calls.

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Uname was profiled to be a slow syscall. It produces always the same
output in the context of a single execution of Redis, so calling it at
every INFO output generation does not make too much sense.

The uname utsname structure was modified as a static variable. At the
same time a static integer was added to check if we need to call uname
the first time.
This commit is contained in:
antirez 2014-03-24 10:00:08 +01:00
parent a9caca0424
commit d3efe04c47
1 changed files with 9 additions and 2 deletions
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11
src/redis.c
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@ -2359,7 +2359,8 @@ sds genRedisInfoString(char *section) {
/* Server */
if (allsections || defsections || !strcasecmp(section,"server")) {
struct utsname name;
static int call_uname = 1;
static struct utsname name;
char *mode;
if (server.cluster_enabled) mode = "cluster";
@ -2367,7 +2368,13 @@ sds genRedisInfoString(char *section) {
else mode = "standalone";
if (sections++) info = sdscat(info,"\r\n");
uname(&name);
if (call_uname) {
/* Uname can be slow and is always the same output. Cache it. */
uname(&name);
call_uname = 0;
}
info = sdscatprintf(info,
"# Server\r\n"
"redis_version:%s\r\n"