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IDS Forum

RE: Performance Issues

Posted By: Simmons, Keith
Date: Tuesday, 17 May 2005, at 4:18 a.m.

In Response To: Performance Issues (SUE SIMMONDS)

Sue

Êched reads now looks OK, don't believe the cached writes ! ,I think the engine is lying. IDS 9.21 is very old, any chance of updating to 9.4? The X in HC6X6 indicates a patched engine, even more reason to upgrade to a more supported version.
What are your checkpoints like? What about onstat -F? I there any user perception of slow running?

Keith

-----Original Message-----
From: sues@hmgcc.gsi.gov.uk [mailto:sues@hmgcc.gsi.gov.uk]
Sent: Monday, May 16, 2005 2:10 PM
To: Simmons, Keith; ids@iiug.org
Subject: Re: Performance Issues [4950]

I have now increased the buffers from 40000 to 80000, LRU from 10 to 20 and CLEANERS from 12 to 24 and bounced the server.
The server has been up for just over 1 hour and onstat -p shows

Informix Dynamic Server 2000 Version 9.21.HC6X6 -- On-Line -- Up 01:22:18 -- 377200 Kbytes

Profile
dskreads pagreads bufreads Êched dskwrits pagwrits bufwrits Êched
96659 125354 23467579 99.59 151039 104045 101784 0.00

isamtot open start read write rewrite delete commit rollbk
24314753 800197 1291125 15254883 3177 232 2364 588 3

gp_read gp_write gp_rewrt gp_del gp_alloc gp_free gp_curs
24609 12 2271 8 0 0 22

ovlock ovuserthread ovbuff usercpu syscpu numckpts flushes
0 0 0 1004.44 50.46 17 36

bufwaits lokwaits lockreqs deadlks dltouts ckpwaits compress seqscans
3239 28 25717535 1 0 5 491 12376

ixda-RA idx-RA da-RA RA-pgsused lchwaits
4422 136 32039 36480 71

Sue

----- Original Message -----
From: Simmons, Keith
To: SUE SIMMONDS ; ids@iiug.org
Sent: 16 May 2005 9:21 AM
Subject: RE: Performance Issues [4950]


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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