[BlueOnyx:09306] Re: Heavy load during lots of httpd requests

[Greg Kuhnert]

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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