topic Re: Performance PROBLEM on k570 server. in Operating System - HP-UX

Performance PROBLEM on k570 server.

Shaamil — Wed, 05 Nov 2003 05:16:55 GMT

Hi Gurus.
I need your help....
I have a K570 server with 5 X 200MHz processors, 2 gig memory, 2 storage arrays of + - 200gig in both, which we use for our in-house application.

I also have another serverwith the same config, but just an extra cpu, which we use for our database(sybase) server.

Now we have some major performance issues on our application server for the past 2 weeks. Nothing new was added. The performance has gradually been degrading as we keep on adding more users to the server. See attached document for an output of top.

I think our server is over utilised, but not sure as the idle time is sometims ok.

If there are any advise, please do not hesitate..
Thanks in advance.

Re: Performance PROBLEM on k570 server.

Jean-Luc Oudart — Wed, 05 Nov 2003 05:39:17 GMT

Do you have a baseline (top, etc ...) for this server when everything was fine ?

swapinfo -tam output.
Is this server application or application + database ?

more info available ?

Rgds,
JL

Re: Performance PROBLEM on k570 server.

Bernhard Mueller — Wed, 05 Nov 2003 05:58:06 GMT

Hi,

first quick guess would be that you desperately need more memory. However, you need to invesigate a bit deeper see attached doc.

Regards,
Bernhard

Re: Performance PROBLEM on k570 server.

Steve Lewis — Wed, 05 Nov 2003 06:43:57 GMT

Your load average is huge.

This means that your CPUs can't keep up with all the processes (3700) that are ready to execute.

I also note that swapper is running and your free memory is low. This probably means that your buffer cache is fully decreased. I guess you also see vhand running a lot.

ttisr services client requests. This is another symptom of too many interactive users all competing for resources.

You need to add memory and upgrade to 4 of the fastest cpus your machine can hold, otherwise upgade the whole machine.

Re: Performance PROBLEM on k570 server.

Jon Mattatall — Wed, 05 Nov 2003 07:51:03 GMT

I thank you. I used to think I had it bad here.

We run multiple instances of Oracle off of K370's - about a dozen apiece. The users complain of "almost unusable" slowness when load hits 4 or 5, never mind 50.

It's the users. You are CPU bound, and your poor old K cannot keep up. Adding the extra processor will have some effect, but certainly will not solve the problem.

If this load is constant, you need a more powerful box. There is a chance that you have something in particular going on that is tying up the CPU's - in my attachment, it's Omniback, but during our afternoon peak usage, things look the same.