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Re: high "Load Average"

March 13, 2010 02:29AM
Cliff Wells Wrote:
-------------------------------------------------------
> You fail to mention what sort of disk subsystem you are using.
One SCSI disk

> High load is often indicative of I/O bottlenecks.
> You also don't mention what OS you are using,
CentOS release 5.4

> you should install iotop and take a look at what process is driving the load
Here is the snippet from iotop output
Total DISK READ: 3.33 K/s | Total DISK WRITE: 3.27 M/s
TID PRIO USER DISK READ DISK WRITE SWAPIN IO> COMMAND
20264 be/4 nobody 0.00 B/s 0.00 B/s 0.00 % 99.99 % php-cgi --fpm --fpm-config /etc/php-fp
21604 be/4 nobody 0.00 B/s 0.00 B/s 0.00 % 99.99 % php-cgi --fpm --fpm-config /etc/php-fp
21605 be/4 nobody 0.00 B/s 0.00 B/s 0.00 % 99.99 % php-cgi --fpm --fpm-config /etc/php-fp
20054 be/4 nobody 0.00 B/s 0.00 B/s 0.00 % 99.99 % php-cgi --fpm --fpm-config /etc/php-fp
20902 be/4 nobody 0.00 B/s 0.00 B/s 0.00 % 99.99 % php-cgi --fpm --fpm-config /etc/php-fp
20275 be/4 nobody 0.00 B/s 0.00 B/s 0.00 % 99.99 % php-cgi --fpm --fpm-config /etc/php-fp
20828 be/4 nobody 0.00 B/s 0.00 B/s 0.00 % 99.99 % php-cgi --fpm --fpm-config /etc/php-fp

Looks like php-cgi makes 99.99% IO, but not really sure what this means

> (it might be Nginx, but more likely MySQL - restarting Nginx simply cancels whatever pending
> requests MySQL had is my guess).
MySQL is running on another PC, so php makes network connections to DB. It may take a while, of course, but should not php being blocked and sleeping while network system is processing request?

Thanks,
Sessna
Subject Author Posted

high "Load Average"

Sessna March 12, 2010 12:34PM

Re: high "Load Average"

Cliff Wells March 12, 2010 02:12PM

Re: high "Load Average"

Sessna March 13, 2010 02:29AM

Re: high "Load Average"

Cliff Wells March 13, 2010 11:48AM

Re: high "Load Average"

Sessna March 14, 2010 05:15AM

Re: high "Load Average"

Cliff Wells March 15, 2010 06:36PM

Re: high "Load Average"

Stefan Parvu March 13, 2010 12:10PM

Re: high "Load Average"

Sessna March 14, 2010 07:46AM

Re: high "Load Average"

Stefan Parvu March 14, 2010 12:48PM

Re: high "Load Average"

Sessna March 15, 2010 04:55AM

Re: high "Load Average"

Stefan Parvu March 15, 2010 08:10AM

Re: high "Load Average"

Sessna March 16, 2010 11:53AM

Re: high "Load Average"

Stefan Parvu March 16, 2010 12:40PM

Re: high "Load Average"

Sessna March 18, 2010 06:01AM

Re: high "Load Average"

Cliff Wells March 16, 2010 01:36PM

Re: high "Load Average"

Rob Mueller March 23, 2010 11:04PM

Re: high "Load Average"

Yu Sun March 19, 2010 11:14PM



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