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

[Eric Cope]

More RAM would certainly help as well. Its minimum requirements is 100MB,
but 1GB would probably be a good minimum, especially with the prices of
memory these days.
Eric

On Wed, Jul 8, 2009 at 12:23 PM, Joshua Zeidner <jjzeidner at gmail.com> wrote:

>  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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-- 
Eric Cope
http://cope-et-al.com
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