On 1/4/2012 9:38 AM, Chris Gebhardt - VIRTBIZ Internet wrote:
Robert Fitzpatrick wrote:
Thanks Chris. When you say more power, you mean move them to a dedicated
server off the VPS or extend more CPU/RAM to the VPS? It didn't seem the
RAM was an issue as it does not pull anything from Swap while under
heavy load. The CPU seems to go under heavy load due to the number of
httpd processes running, which in turn seem to be waiting on a response
from something else.
I think I would look at 3 main areas:
1. RAM (which you don't feel is the issue)
2. Processor
3. Network capacity
Also, since you mention VPS, add a 4th area:
4. Drive
I'd like to add some words here. On more than one occasion, I have found
disk to be a major bottleneck. While looking at one of these problems a
while back, there was a wonderful command that Michael passed to me to
help get statistics and metrics on disk performance
|*iostat* -t -d -x 1 100
Run that - and look at the await times - If they are constantly big, you
have a problem. Same goes for %util - if thats constantly big, you have
a problem.
This tool is part of the sysstat rpm - install it before running the
above command :)
Regards,
Greg.
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