PHP Script timing out and MySql using almost all the CPU and RAM questions

[keith smith]

Thanks,  I had not thought of the log.  I think it is turned on already.

Thanks again!

------------------------
Keith Smith


--- On Wed, 7/8/09, Joshua Zeidner <jjzeidner at gmail.com> wrote:

> From: Joshua Zeidner <jjzeidner at gmail.com>
> Subject: Re: PHP Script timing out and MySql using almost all the CPU and RAM  questions
> To: "Main PLUG discussion list" <plug-discuss at lists.plug.phoenix.az.us>
> Date: Wednesday, July 8, 2009, 12:23 PM
>   sounds like you have either a
> MySQl bug or a problem query.  Turn on
> query logging and get the query that is causing the problem
> and post
> it here.
> 
>   -jmz
> 
> On Wed, Jul 8, 2009 at 12:21 PM, keith smith<klsmith2020 at yahoo.com>
> wrote:
> >
> >
> > Hi Everyone,
> >
> > I do support for an online store.
> >
> > Last night we were trying to run a report that was
> taking forever.  It is a lot of data so I expected it to
> timeout.  The owner says he has successfully run the report
> before.  I shelled in and found MySql was using 98.3% of
> the CPU and I think 4.7% of Memory.
> >
> > I restarted MySql and the load went down to nothing.
> >
> > While I was in there I noticed we have 513764k of RAM,
> and we were using almost all of it and we were using some
> swap as well.
> >
> > Here is what I just pulled off the system.
> >
> > top - 11:12:54 up 229 days, 20:08,  3 users,  load
> average: 0.21, 0.16, 0.07
> > Tasks:  80 total,   2 running,  78 sleeping,   0
> stopped,   0 zombie
> > Cpu(s):  1.0%us,  0.3%sy,  0.0%ni, 95.7%id,
>  0.0%wa,  3.0%hi,  0.0%si,  0.0%st
> > Mem:    513764k total,   506652k used,     7112k
> free,     4904k buffers
> > Swap:  3723784k total,    32276k used,  3691508k
> free,   311520k cached
> >
> >
> > This raises a number of questions:
> >
> > 1) What could cause the MySql server to start using so
> much CPU?  After a restart we ran the report again and the
> CPU usage was much less.  The report still timed out.
> >
> > 2) I'm wondering if more RAM would make the system
> more responsive?  I've seen the benefits of RAM first hand
> but not in how it would speed up a web server.
> >
> > 3) The report we were running gave no indication of
> timing out. I'm wondering how the following PHP.ini
> directives come into play:
> >
> > - max_execution_time = 30 : In seconds.  Why would
> the script appear to keep working?
> >
> > - max_input_time = 60 : Same question as above.
> >
> > I'm wondering if setting the memory -
> ini_set('memory_limit', '64M'); in that app, if that would
> help much and if I extend the time if that might help -
> ini_set('max_execution_time',240);  along with
> ini_set("max_input_time", 240)  ?
> >
> > Thanks in advance for your help!
> >
> > ------------------------
> > Keith Smith
> >
> >
> >
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