Nginx + PHP = VERY High CPU Usage

[Roger Hoover]

Are you using APC cache?  You may need to adjust the APC config to get
it to work under php-cgi?  Just a guess...

On Fri, Dec 10, 2010 at 11:05 AM, hasson <nginx-forum at nginx.us> wrote:
> Hello All,
>
> I was using APACHE and I decided to migrate to nginx.
> I researched and nginx is supposed to have a completely superior
> performance for webpages that have lot of simultaneous requests, such as
> real time pages sending AJAX requests every second.
>
> My application is based on MYSQL + PHP + AJAX + JAVASCRIPT.
>
> After I installed the NGINX, I started testing it, and noticed that
> something is strange due the HIGH-CPU usage of PHP-CGI process.
>
> The curious is that with around 6-8 Tabs open on Firefox, I can reach
> around 80% of CPU usage. that is completely high, even with this test
> machine that have a cpu of only 1.8ghz. But talking about only 8 web
> pages open, reach this amount of CPU usage, I think that something is
> wrong.
>
> Anyone can please advise me?
>
> [size=x-small]last pid: 39019;  load averages:  0.98,  0.22,  0.08
>
> up 4+16:53:45  17:03:29
> 51 processes:  2 running, 49 sleeping
> CPU: 84.8% user,  0.0% nice, 14.4% system,  0.4% interrupt,  0.4% idle
> Mem: 46M Active, 204M Inact, 83M Wired, 128K Cache, 60M Buf, 157M Free
> Swap: 991M Total, 991M Free
>
>  PID USERNAME  THR PRI NICE   SIZE    RES STATE    TIME   WCPU COMMAND
> 39017 www         1  70    0 18908K 10932K accept   0:04 17.09% php-cgi
> 39009 www         1  72    0 18908K 11396K accept   0:05 16.26% php-cgi
> 39008 www         1  68    0 18908K 11428K accept   0:05 15.67% php-cgi
> 39019 www         1  66    0 18908K 10932K accept   0:03 15.48% php-cgi
> 39018 www         1  64    0 21980K 13100K RUN      0:03 13.96% php-cgi
>  954 mysql      14  44    0 63332K 30672K sbwait   5:55  0.00% mysqld
>  1150 daemon      6  44    0 13460K  6716K ucond    0:34  0.00%
> memcached
>  1617 nobody      1  44    0  5348K  4180K kqread   0:12  0.00% nginx
>  1009 root        1  44    0  6080K  3476K select   0:11  0.00%
> sendmail
>  1020 root        1  44    0  3376K  1372K nanslp   0:04  0.00% cron
>  1001 root        1  44    0  6704K  3744K select   0:02  0.00% sshd
>  642 root        1  44    0  3348K  1336K select   0:02  0.00% syslogd
> 38189 rafael      1  44    0  9428K  4552K select   0:01  0.00% sshd
>  1013 smmsp       1  44    0  6080K  3332K pause    0:00  0.00%
> sendmail
>  783 www         1  73    0 17884K  8412K wait     0:00  0.00% php-cgi
>  812 nobody      1  44    0  3292K  1296K select   0:00  0.00% noip2
> 38186 root        1  44    0  9428K  4488K sbwait   0:00  0.00% sshd
>  1487 root        1  44    0  5348K  3636K pause    0:00  0.00% nginx
> 38193 root        1  44    0  4564K  2404K wait     0:00  0.00% bash
> 39016 root        1  44    0  3684K  1956K RUN      0:00  0.00% top
>  823 root        1  76    0  3628K  1504K wait     0:00  0.00% sh
> 38192 rafael      1  44    0  3808K  1724K wait     0:00  0.00% su
> 38190 rafael      1  45    0  3628K  1612K wait     0:00  0.00% sh
>  1084 root        1  76    0  3348K  1156K ttyin    0:00  0.00% getty
>  508 root        1  44    0  1888K   584K select   0:00  0.00% devd
>  1086 root        1  76    0  3348K  1156K ttyin    0:00  0.00% getty
>  1085 root        1  76    0  3348K  1156K ttyin    0:00  0.00% getty
>  1089 root        1  76    0  3348K  1156K ttyin    0:00  0.00% getty
>  1087 root        1  76    0  3348K  1156K ttyin    0:00  0.00% getty
>  1090 root        1  76    0  3348K  1156K ttyin    0:00  0.00% getty
>  1091 root        1  76    0  3348K  1156K ttyin    0:00  0.00% getty
>  1088 root        1  76    0  3348K  1156K ttyin    0:00  0.00% getty
>  120 root        1  76    0  1540K   844K pause    0:00  0.00%
> adjkerntz[/size]
>
> Posted at Nginx Forum: http://forum.nginx.org/read.php?2,157575,157575#msg-157575
>
>
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