How will it run with this setup?

I'm the Systems Administrator for PPCGeeks.com.

We're using nginx as the webserver and have completely dropped Apache.

PHP is setup as FastCGI with version 5.2.10.

MySQL is 5.0.85.

We have a Wordpress blog that is using the vB bridge to bridge the users. Wordpress is at PPCGeeks and the vBulletin forums are PPCGeeks.

Intel Xeon X3220 Quad Core 2.40GHz
4GB RAM

We're also using XCache.

With this setup, our server load is anywhere from 1.20 to 3.00, but it rarely gets above 2.00 with vB showing about 1,000 users on with a 15 minute timeout.

So by having VBSEO installed, how much would my server load go up? I know with Apache, the rewrites could cause a really high server load, but I'm not sure how well nginx handles it compared to Apache.

We just want to get some input before we make a purchase.

Thanks!

It's hard to say exactly what you will see. IMO, an average load level over 1 is already high. are you sure thats not divided by your 4 cores yet?

I personally saw about .2 load average increase, from .5 to .7 when i first installed, and this was on apache 1.3 back in the day.

I'm not sure what you mean by "divided by your 4 cores yet". I'm just taking the stats out of the top command.

Here's my current top stats:

Code:

top - 08:02:20 up 56 days, 14 min,  1 user,  load average: 1.93, 1.54, 1.17
Tasks: 128 total,   2 running, 126 sleeping,   0 stopped,   0 zombie
Cpu0  : 26.0% us,  2.3% sy,  0.0% ni, 71.0% id,  0.7% wa,  0.0% hi,  0.0% si
Cpu1  : 28.7% us,  2.7% sy,  0.0% ni, 65.7% id,  3.0% wa,  0.0% hi,  0.0% si
Cpu2  : 31.5% us,  2.0% sy,  0.0% ni, 66.2% id,  0.3% wa,  0.0% hi,  0.0% si
Cpu3  : 18.1% us,  1.0% sy,  0.0% ni, 77.9% id,  3.0% wa,  0.0% hi,  0.0% si
Mem:   4150356k total,  3538296k used,   612060k free,   112808k buffers
Swap:  2096440k total,     6960k used,  2089480k free,  2837292k cached

PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
16   0 98064  36m  32m S 28.6  0.9  11:21.59 php-cgi
16   0 98272  37m  32m S 25.6  0.9  11:00.84 php-cgi
16   0 99.6m  43m  34m R 24.3  1.1  11:03.32 php-cgi
16   0 98292  38m  33m S 20.3  0.9  10:59.32 php-cgi
15   0  849m 122m 3964 S 12.0  3.0   1:05.64 mysqld
15   0 20508  15m  920 S  1.0  0.4 278:07.65 nginx
15   0 20236  14m  924 S  0.7  0.4 273:31.57 nginx

Generally load is not seperated by core. When you have multi-core and multi-proc's, the load level is actually a derivative of that number of cores.

This article may help: Examining Load Average