IDS Forum

RE: Performance Issues

Posted By: Simmons, Keith
Date: Monday, 16 May 2005, at 4:27 a.m.

In Response To: Performance Issues (SUE SIMMONDS)

Sue

40,000 buffers seems a bit low, especially as you have hit
some foreground writes. What does a full onstat -p show (especially
over a period of time, what is changing the most). How long are
checkpoints taking?
If you have the memory available I would try doubling buffers as a
first step and are fully monitor checkpoints with a view to reducing
LRU percentages. Probably need to double (or more) number of LRUs
and CLEANERs.
Any clues from Unix side? sar -d ? sar ?

Keith


-> -----Original Message-----
-> From: SUE SIMMONDS [mailto:sues@hmgcc.gsi.gov.uk]
-> Sent: Friday, May 13, 2005 10:33 PM
-> To: ids@iiug.org
-> Subject: Performance Issues [4950]
->
->
-> I am running IDS 9.21.HC6 on HP UX 11.0. Until recently
-> everything has been running smothly but over the last 2/3
-> weeks users have reported problems with one of our
-> applications delivered over the web.
->
-> I have also noticed that the % reads cached figure (onstat
-> -p) is very low, sometimes 0%, so I knew something was very wrong !!
->
-> Last week I noticed multiple ETXFilterServers running (for
-> the Excalibur index in the database). I killed off the
-> excess and bounced the server. And all seemed OK. The %
-> reads cached figure was up in the 70's, not as good as it
-> should be but better.
->
-> At the weekend I was running lots of dbexports/dbimports and
-> the Êched figure was about 85%, as expected. As soon as the
-> users logged on this morning and started running our web
-> applications the Êched figure slowly dropped and is now 19.44%.
->
-> I have 40000 buffers defined for 8 LRU queues,
->
-> onstat -b shows 836 modified, 0 resident, 40000 total
->
-> onstat -F shows 2 Fg write, 534203 LRU writes, 57178 Chunk writes
->
-> onstat -R shows 5 dirty, 40000 queued, 40000 total, start clean at 4%
-> (160), stop at 2%
->
-> As far as I am aware nothing has changed on the Database
-> server but I am not sure about the Web Server. I am also not
-> very familiar with the Excalibur Text Search Datablade and
-> the ETXFilterServers.
->
-> Our web applicaiton is a document management system
-> delivered over the web and users are experiencing problems
-> bookings documents back in, as it seems to ages and
-> sometimes the browser is timing out (we currently have a 5
-> minute timeout set on the server).
->
-> Does anyone have any ideas what might be causing these
-> problems, or anything else I need to check/monitor ???
->
-> Sue
->

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Messages In This Thread

• Performance Issues
  SUE SIMMONDS -- Friday, 13 May 2005, at 5:32 p.m.
  • RE: Performance Issues
    Simmons, Keith -- Monday, 16 May 2005, at 4:27 a.m.
  • RE: Performance Issues
    Simmons, Keith -- Tuesday, 17 May 2005, at 4:18 a.m.
  • RE: Performance Issues
    Simmons, Keith -- Tuesday, 17 May 2005, at 6:00 a.m.
  • RE: Performance Issues
    Simmons, Keith -- Tuesday, 17 May 2005, at 8:26 a.m.
    • Re: Performance Issues
      Michael Hoffman -- Tuesday, 17 May 2005, at 11:34 a.m.

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