topic Re: vmstat in Operating System - HP-UX

vmstat

Tonatiuh — Fri, 01 Oct 2004 13:06:55 GMT

HP-UX 11.23.

vmstat shows in the column r (runque waits) a number mayor than my number of CPUs. But the percentage of usage of the CPUs es 50%.

How can this happend?

What is the meaning of this situacion?

Re: vmstat

G. Vrijhoeven — Fri, 01 Oct 2004 13:20:39 GMT

Hi,

this could indicate an disk bottleneck.
You could check sar -uM for info on how the CPUs are used.

Regards,

Gideon

Re: vmstat

RAC_1 — Fri, 01 Oct 2004 13:29:04 GMT

What does following give??

uptime
glance -a
sar -q 5 5

Anil

Re: vmstat

Mark Greene_1 — Fri, 01 Oct 2004 13:34:34 GMT

In addition to what Gideon suggested, I'd also run several iterations of iostat to determine if any particular disk is being hit hard.

Do you have glance? There is, if I recall correctly, a 30 day trial on the CD of software extras that comes with the OS CD set. You can watch CPU and disk traffic in real time with that.

mark

Re: vmstat

Tonatiuh — Fri, 01 Oct 2004 13:53:48 GMT

$ uptime
8:50pm up 13 days, 10:59, 1 user, load average: 0.10, 0.14, 0.22

$ glance -a
/usr/bin/sh: glance: not found.

$ sar -q 5 5

HP-UX oficial1 B.11.23 U ia64 10/01/04

20:52:29 runq-sz %runocc swpq-sz %swpocc
20:52:34 2.0 10 0.0 0
20:52:39 0.0 0 0.0 0
20:52:44 1.5 20 0.0 0
20:52:49 1.0 30 0.0 0
20:52:54 2.0 10 0.0 0

Average 1.4 14 0.0 0

Re: vmstat

RAC_1 — Fri, 01 Oct 2004 14:13:16 GMT

iostat 3 10
sar -d 5 10

Anil

Re: vmstat

Sridhar Bhaskarla — Fri, 01 Oct 2004 14:14:00 GMT

Hi,

I wouldn't be too concerned about the queues reported by vmstat, sar or uptime if the CPU utilization is not near 90%. It's merely an average of the samples and may not necessarily a real figure.

I would have looked for patches if the OS is of earlier versions like 10.20 etc.,. Unless your application is really impacted, I wouldn't worry much about it.

-Sri