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Use the "recent time" cache to optimize timestamp generation for

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the httpd error log

Background: According to some profile data that we collected on Solaris,
half the run time of ap_log_rerror() was spent in localtime(3).   With
this change, the recent-time cache ensures that the error logger won't
cause more than one localtime() call per second, no matter how high the
error rate is.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@93977 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Brian Pane
2002-03-17 05:13:12 +00:00
parent f4a27d9935
commit e3bfcb1430
4 changed files with 55 additions and 1 deletions
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2
CHANGES
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@ -1,5 +1,7 @@
Changes with Apache 2.0.34-dev
*) Performance improvement for the error logger [Brian Pane]
*) Change configure so that Solaris 8 and above have
SINGLE_LISTEN_UNSERIALIZED_ACCEPT defined by default.
according to sun people solaris 8+ doesn't have a thundering

7
include/util_time.h
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@ -102,6 +102,13 @@ AP_DECLARE(apr_status_t) ap_explode_recent_gmt(apr_time_exp_t *tm,
apr_time_t t);
/**
* format a recent timestamp in the ctime() format.
* @param date_str String to write to.
* @param t the time to convert
*/
AP_DECLARE(apr_status_t) ap_recent_ctime(char *date_str, apr_time_t t);
#ifdef __cplusplus
}
#endif

2
server/log.c
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@ -409,7 +409,7 @@ static void log_error_core(const char *file, int line, int level,
if (logf && ((level & APLOG_STARTUP) != APLOG_STARTUP)) {
errstr[0] = '[';
apr_ctime(errstr + 1, apr_time_now());
ap_recent_ctime(errstr + 1, apr_time_now());
errstr[1 + APR_CTIME_LEN - 1] = ']';
errstr[1 + APR_CTIME_LEN ] = ' ';
len = 1 + APR_CTIME_LEN + 1;

45
server/util_time.c
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@ -173,3 +173,48 @@ AP_DECLARE(apr_status_t) ap_explode_recent_gmt(apr_time_exp_t * tm,
{
return cached_explode(tm, t, exploded_cache_gmt, 1);
}
AP_DECLARE(apr_status_t) ap_recent_ctime(char *date_str, apr_time_t t)
{
/* ### This code is a clone of apr_ctime(), except that it
* uses ap_explode_recent_localtime() instead of apr_explode_localtime().
*/
apr_time_exp_t xt;
const char *s;
int real_year;
/* example: "Wed Jun 30 21:49:08 1993" */
/* 123456789012345678901234 */
ap_explode_recent_localtime(&xt, t);
s = &apr_day_snames[xt.tm_wday][0];
*date_str++ = *s++;
*date_str++ = *s++;
*date_str++ = *s++;
*date_str++ = ' ';
s = &apr_month_snames[xt.tm_mon][0];
*date_str++ = *s++;
*date_str++ = *s++;
*date_str++ = *s++;
*date_str++ = ' ';
*date_str++ = xt.tm_mday / 10 + '0';
*date_str++ = xt.tm_mday % 10 + '0';
*date_str++ = ' ';
*date_str++ = xt.tm_hour / 10 + '0';
*date_str++ = xt.tm_hour % 10 + '0';
*date_str++ = ':';
*date_str++ = xt.tm_min / 10 + '0';
*date_str++ = xt.tm_min % 10 + '0';
*date_str++ = ':';
*date_str++ = xt.tm_sec / 10 + '0';
*date_str++ = xt.tm_sec % 10 + '0';
*date_str++ = ' ';
real_year = 1900 + xt.tm_year;
*date_str++ = real_year / 1000 + '0';
*date_str++ = real_year % 1000 / 100 + '0';
*date_str++ = real_year % 100 / 10 + '0';
*date_str++ = real_year % 10 + '0';
*date_str++ = 0;
return APR_SUCCESS;
}