rp2405 performance

[Mark Klein]

We are running an rp2405 with HP-UX 11.11 (11i) and have approximately 35 users connecting via telnet to access our MRP software. (The software is running in an IBM Universe RDBMS.)

The issue we are having is noticeable slowdowns in system performance when a user is keying data. As they are keying, the system will appear to "stop" from time to time and the user will have to wait until it "catches up" to what they have already typed on the keyboard.

Can I use sar or some other system utility to help determine what is causing this possible I/O bottleneck? I'm also thinking it may be related to one or more kernel parameters that may just need to be tweaked. The system has 512Mb of RAM and 1024Mb of swap with pseudoswap disabled.

Thanks for any help or suggestions you can offer!

Mark Klein

[Paula J Frazer-Campbell]

Mark

Use glance, sar and top.

There is a glance 60 trial on the HP cds.

If you can post a top/sar output then maybe we can direct you to where the problem might be.


Paula

[Dario_1]

Hi Mark!

I will use the trial version of Glance (60 days) if you don't have Glance installed in your system. You will be able to get more information from it.

Regards,

DR

[Brian Bergstrand]

What is the max_users kernel param? If it's less than 512, you may try bumping it to 512. This in turn will raise other kernel buffers which should help when more than a few users are connected.

HTH.

[Brian Bergstrand]

Doh! That's 'maxusers' not 'max_users'. Sorry.

[A. Clay Stephenson]

You should really load Glance (even the trial version) to zero in on your problem. If I were forced to guess, I would suspect memory pressure and you are probably swapping. 512MB is really a tiny amount of memory these days especially with a 64-bit OS. If you keft dbc_max_pct at the default 50% then you should immediately reduce it to no more than about 15%. Run vmstat and see if the pageout rate (po) is significant.

The standard admonition to apply the lastest patchsets (HWE and GOLDQPK) also applies but until you post some kmtune, vmstat, swapinfo, ipcs -a , sar, and/or Glance output then there is not a lot anyone can do.

[Paula J Frazer-Campbell]

Brian

Welcome to the Forum

Paula

[Mark Greene_1]

Mark,

If you change the max users in unix, be sure that the Universe tuning is changed as well, if needed.

Also, have you noticed if the slowness correlates at all to printing? If a lot of reports are being printed, you can look in the uv.config file to see what disk/file system Universe is using for its spooler space. You may need to relocate the UV spooler.

Finally, while Universe requires only 32k of RAM per user (last I worked with it), you may still benefit from adding another 512MB of RAM. See if you can get someone from Universe support to look at your hardware and your uv.config file settings and see if your not at some maximum threshold.

HTH
mark

[Dario_1]

Hi again!

Use swapinfo -ta to check if you are swapping to device. Also check the following kernel parameters:

dbc_max_pct 10 - 10
dbc_min_pct 3 - 3

Make sure they are not set to their deafult values which are 50 and 10.

I will also enable pseudoswap.

Hope this helps.

regards,

DR

[Steven E. Protter]

Here is a great doc on performance tuning.


http://www1.itrc.hp.com/service/cki/search.do?category=c0&docType=Security&docType=Patch&docType=EngineerNotes&docType=BugReports&docType=Hardware&docType=ReferenceMaterials&docType=ThirdParty&searchString=UPERFKBAN00000726&mode=id&admit=-682735245+1053636168960+28353475&searchCrit=allwords&printable=true

I got it yesterday.

Attached is a package of performance measurement scripts that gather data for a time period you set in the script.

The typing thing is a symptom of a performance problem.

I don't usually comment on others posts, but leave maxusers alone.

SEP

[Rajesh G. Ghone]

Hi Mark,

You can install trial version of Glance Plus which will tell you about your resources,or you can use TOP if you dont want to use TOP you can still try it out with Measureware trial version install which will coleect the entire data this data you can send it to HP for further analyse.

Hope this solves your problem.

Regards,

Rajesh G.

[Rajesh G. Ghone]

Hi Mark,

You can install trial version of Glance Plus which will tell you about your resources,or you can use TOP if you dont want to use TOP you can still try it out with Measureware trial version install which will coleect the entire data this data you can send it to HP for further analyse.

Hope this solves your problem.

Regards,

Rajesh G.

[Leif Halvarsson_2]

Hi,

It sounds more likley to me that it is some kind of network problem . Try to ftp some (large) files in both directions and check what performance you get.