[syslog-ng] 3.4.4 uses twice the cpu as 3.4.1

[Evan Rempel]

I may have spoke too soon. This is with binaries compiled with 
CFLAGS="-ggdb3 -O0" which is different than
I used when compiling syslog-ng 3.4.1

After some testing is completed in a day or two, I will recompile 
without those flags and I'll have an apples
to apples comparison.

Evan

On 10/20/2013 04:37 PM, Evan Rempel wrote:
> I just upgraded syslog-ng from 3.4.1 to 3.4.4 and can confirm that 
> with the same configuration, it
> is using twice as much cpu. See the attached graph.
>
> We also take 15 minute snapshots of our processes and for the 
> syslog-ng process the CPU usage is shown
> below. Note that when the process ID changes from 12307 to 5156 the 
> CPU doubles.
>
> Time USER PPID PPID %CPU VSZ ELAPSED TIME COMMAND
> 074602 root 12307 19898 11.1 787228 21:21:12 02:23:20 
> /usr/local/sbin/syslog-ng
> 080101 root 12307 19898 11.1 787228 21:36:11 02:25:04 
> /usr/local/sbin/syslog-ng
> 081601 root 12307 19898 11.2 787228 21:51:11 02:26:58 
> /usr/local/sbin/syslog-ng
> 083101 root 12307 19898 11.2 787228 22:06:11 02:28:44 
> /usr/local/sbin/syslog-ng
> 084601 root 12307 19898 11.2 787228 22:21:11 02:30:32 
> /usr/local/sbin/syslog-ng
> 090101 root 12307 19898 11.2 776984 22:36:11 02:32:25 
> /usr/local/sbin/syslog-ng
> 091601 root 12307 19898 11.2 787228 22:51:11 02:34:35 
> /usr/local/sbin/syslog-ng
> 093102 root 5156 5155 23.3 705312 00:06:20 00:01:28 
> /usr/local/sbin/syslog-ng
> 094601 root 5156 5155 24.1 705772 00:21:19 00:05:08 
> /usr/local/sbin/syslog-ng
> 100101 root 5156 5155 24.0 705772 00:36:19 00:08:44 
> /usr/local/sbin/syslog-ng
> 101601 root 5156 5155 24.3 705772 00:51:19 00:12:29 
> /usr/local/sbin/syslog-ng
> 103101 root 5156 5155 23.8 705772 01:06:19 00:15:50 
> /usr/local/sbin/syslog-ng
> 104601 root 5156 5155 23.4 705772 01:21:19 00:19:05 
> /usr/local/sbin/syslog-ng
> 110101 root 5156 5155 23.2 705772 01:36:19 00:22:23 
> /usr/local/sbin/syslog-ng
> 111601 root 5156 5155 23.2 705772 01:51:19 00:25:56 
> /usr/local/sbin/syslog-ng
> 113101 root 5156 5155 23.3 705772 02:06:19 00:29:30 
> /usr/local/sbin/syslog-ng
> 114601 root 5156 5155 23.4 705772 02:21:19 00:33:09 
> /usr/local/sbin/syslog-ng
> 120101 root 5156 5155 23.4 705772 02:36:19 00:36:38 
> /usr/local/sbin/syslog-ng
> 121601 root 5156 5155 23.5 705772 02:51:19 00:40:17 
> /usr/local/sbin/syslog-ng
> 123101 root 5156 5155 23.5 705772 03:06:19 00:43:49 
> /usr/local/sbin/syslog-ng
> 124601 root 5156 5155 23.4 705772 03:21:19 00:47:14 
> /usr/local/sbin/syslog-ng
> 130101 root 5156 5155 23.5 705772 03:36:19 00:51:00 
> /usr/local/sbin/syslog-ng
> 131601 root 5156 5155 23.7 705772 03:51:19 00:54:50 
> /usr/local/sbin/syslog-ng
> 133101 root 5156 5155 23.9 705772 04:06:19 00:59:04 
> /usr/local/sbin/syslog-ng
> 134601 root 5156 5155 23.8 705772 04:21:19 01:02:25 
> /usr/local/sbin/syslog-ng
> 140102 root 5156 5155 23.8 705772 04:36:20 01:06:00 
> /usr/local/sbin/syslog-ng
> 141601 root 5156 5155 23.8 705772 04:51:19 01:09:30 
> /usr/local/sbin/syslog-ng
> 143101 root 5156 5155 23.9 705772 05:06:19 01:13:13 
> /usr/local/sbin/syslog-ng