Nginx + php 5.3.5 fpm result is high server load

Server NGINX
1

Hi Guys,
we try to migrate our apache 2.2 mod_fcgid with php-cgi configuration
to nginx + php-fpm from ports on our freebsd 8.2 stable system.We hosted
round 200-300 sites.

The result is high load of the server, lots of system calls and
mysql-server 5.1.55 has doubling his threads.

Any suggestion ?

Posted at Nginx Forum:

2

On Sat, 2011-02-26 at 16:52 -0500, izrodix wrote:

Hi Guys,
we try to migrate our apache 2.2 mod_fcgid with php-cgi configuration
to nginx + php-fpm from ports on our freebsd 8.2 stable system.We hosted
round 200-300 sites.

The result is high load of the server, lots of system calls and
mysql-server 5.1.55 has doubling his threads.

Any suggestion ?

What’s the filesystem format underneath? We’ve seen some issues recently
with NFS performance if the PHP include path is in the wrong order which
drove the load up to over 200 on a 24-core server with 16G RAM.

We also saw some issues with the maximum memory limits set
in /etc/sysctl.conf which created “false” load in a similar range on the
same box.

HTH,

M.

3

We are using standart UFS file system but IO is not the problem.
This is strange the CPU user == system. With apache22 with mod_fcgid we
have round 20-25% idle and the system load is very low.

last pid: 25961; load averages: 48.43, 34.30, 36.86

                                 up 5+00:02:08  23:45:08

184 processes: 69 running, 114 sleeping, 1 lock
CPU: 52.5% user, 0.0% nice, 47.5% system, 0.0% interrupt, 0.0% idle
Mem: 1786M Active, 4256M Inact, 1256M Wired, 213M Cache, 828M Buf, 407M
Free
Swap: 4096M Total, 92K Used, 4096M Free

Posted at Nginx Forum:

4

Hi list

We have a setup with central NFS server (using 64 NFS daemons at the
moment) and 10 servers that mounts data via NFS4. The NFS server is
using XFS, Linux version 2.6.32-5-amd64 (Debian 2.6.32-30). It’s a VM
with gigabit interface and it delivers around 50-80 MBit in peak time.
It’s a quad core machine with 8 Gig of memory.

From time to time the load literally explodes on the NFS server and eventually
also on the webservers since they can’t access the content on the NFS server.

I found this post via Google and you mentioned that you had a similar
problem with PHP include path - care to enlighten what the problem was
and how you solved it?

Also - if possible - could I have a look at your sysctl.conf file ?

Kind regards,
Lasse L.