topic Re: load average high ? in Operating System - HP-UX

load average high ?

manu_9 — Thu, 24 Jun 2004 05:52:32 GMT

why does a process go in sleep state ??what are the probable causes.Which is pathway to trouble shoot high load.

Re: load average high ?

Manish Srivastava — Thu, 24 Jun 2004 05:58:20 GMT

Hi,

There are several cases when the process can go to sleep like executing a sleep system call or waiting for a resource etc. If you have many process sleeping then there could be a deadlock for a resource. Just check what applications are sleeping and what are they waiting for.

manish

Re: load average high ?

Sanjay Kumar Suri — Thu, 24 Jun 2004 05:59:55 GMT

Read this notes:

http://www.cim.mcgill.ca/~franco/OpSys-304-427/lecture-notes/node16.html

sks

Re: load average high ?

Fred Ruffet — Thu, 24 Jun 2004 06:08:20 GMT

If you have glance, you can see what are different wait states. But in a general way, let's say that process comes to sleep for 2 major reasons :
. It waits on a resource (reading a pipe, accessing the memory...)
. It has been scheduled by OS. OS determines (regarding process demands, priority, load...) if a process must run or sleep.

This two things may not be tunable, but keep on mind that a server having a load greater than 1 is not a problem. You may have a problem when system spend more time scheduling processes than running programs.

You can decrease load by running less program. As it is oftenly nor possible, yu may have to scale your server (higher speed CPUs, or more CPUs...).

Regards,

Fred

Re: load average high ?

manu_9 — Thu, 24 Jun 2004 06:09:24 GMT

Any clues how to find what a process is waiting for .

Re: load average high ?

Fred Ruffet — Thu, 24 Jun 2004 07:24:58 GMT

If you have glance (gpm) it can do.

Regards,

Fred