high load hpux

[Emir Faisal]

Hi,
our production machine is suffering with high-load. On its peak-hour, using glance, we can see that CPU utilization is often touch 100% level.
Is there anything we can do on that machine, to tune & optimize the system, beside hardware upgrades ?

We also had other machine (same model) with relatively lower-load. How to share the cpu-load from machine 1 to machine 2 ?

rgds,
EF

[Geoff Wild · Accepted solution]

There a lot to look at, from memory to cpu...to kernel tuning...

I'd start here:

http://h21007.www2.hp.com/dspp/files/unprotected/devresource/Docs/TechPapers/UXPerfCookBook.pdf

For a quick check, download an evaluation copy of sarcheck:

http://www.sarcheck.com

Rgds...Geoff

[Ted Buis]

There also is a good book by Robert F. Sauers entitled "HP-UX 11i perfromance and tuning". You can get it from amazon.com. Are users complaining? You need to do analysis to determine what is possible. Some technical applications will get a performance boost by increasing the page size (HP-UX 11.0 and later), but it depends on the application.

[David Child_1]

Is the system running noticably slower or do you just note the 100% utilization? The reason I ask is your system can run at 100% utilization and still be performing fine. You might want to run:

vmstat 5 5

Take a look at the first column. It shows the number of processes in the run queue. If this is a high number then you definately have a CPU bottleneck.

As for the second part of your query;

If you want to move some of the load over to machine 2 you will just need to migrate it over. If these are on SAN attached storage you can simply export/import the volume groups (plus any SAN path changes).

Another option is to move some of the resources (e.g. CPUs) over from machine 2 to machine 1.

David

[KapilRaj]

Can u look around and find a way to distribute load i mean.. Do not run those batch processing stuff in the peak hours run them just before the backups in the night.

The second qtn, It depends on how you use the system , If that is just to run some batch programms against a database , you can think of moving some batch programes to the other system.

Also if you have user's connecting to it you may setup a round-robins in DNS so that 50 % of the user's get connected to one node and rest to the other one. But here u need to make sure that Home is NFS mounted etc i.e. All the resources that a user get from the one system needs to be available on the other.

Regds,

Kaps