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Nginx + PHP = VERY High CPU Usage

December 10, 2010 02:05PM
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]
Subject Author Posted

Nginx + PHP = VERY High CPU Usage

hasson December 10, 2010 02:05PM

Re: Nginx + PHP = VERY High CPU Usage

Roger Hoover December 10, 2010 02:16PM

Re: Nginx + PHP = VERY High CPU Usage

hasson December 10, 2010 02:35PM

Re: Nginx + PHP = VERY High CPU Usage

Roger Hoover December 10, 2010 02:46PM

Re: Nginx + PHP = VERY High CPU Usage

Dennis Jacobfeuerborn December 10, 2010 02:52PM

Re: Nginx + PHP = VERY High CPU Usage

Maxime Ducharme December 10, 2010 05:42PM

Re: Nginx + PHP = VERY High CPU Usage

hasson December 12, 2010 11:59AM

Re: Nginx + PHP = VERY High CPU Usage

Hone Watson December 16, 2010 06:36PM



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