Re: Strange Performance Problems

> -----Original Message-----
> From: midrange-l-bounces@xxxxxxxxxxxx
> [mailto:midrange-l-bounces@xxxxxxxxxxxx]On Behalf Of Mike Wills
> Sent: Monday, June 27, 2005 10:00 AM
> To: Midrange Systems Technical Discussion
> Subject: Strange Performance Problems
>
>
> I hope I can get you accurate information here.
>
> We have an LPARed 810 (we have 66% of the CPU) and just recently started
to
> notice some slow down. Last Thursday a job that normally takes 15 minutes,
> took 4 hours. Friday and Wednesday (without any changes in between) ran
> normally.Now this last weekend, we did a test upgrade of our ERP software
> and many of the jobs are now taking about twice the time. Here are some
> stats on this:
>
> Step 1: Last time I ran one job at a time and took about 12.5 hours. This
> time I ran 3 jobs at a time and it took 14.5 hours. Now to me, I would
think
>
> that I would save somewhere from 1/2 to 1/4 of the time by running more
than
>
> 1 at a time. I know that running 3 at a time will make the jobs run
slower,
> but 2 to 3 times slower? This is using straight reads and writes.
>
> Step 2 and 3: These two steps aren't complete yet, but the trend is the
same
>
> about 2 to 3 times slower. Last time I ran 4-6 jobs at a time, this time I
> ran 6 the entire time. I should not be seeing this trend based on the
> numbers I am seeing. This is using this SQL APIs for reads and writes.
>
> So my conclusion is that there is a problem with performance. Our Admin
says
>
> he doesn't see anything. I don't know what all he checked, but I am coming
> to you guys hoping for more ideas. The disk drives (according to
WRKDSKSTS)
> aren't being hit very hard. CPU has been running 95+ percent the entire
> time, even though job percentages in WRKACTJOB don't add up to 95+%.
> WRKSYSSTS looks to be normal as well. The Admin said that the cache
battery
> isn't low and there isn't a lot of CPU usage on the disk controller. To
our
> knowledge, no PTs or other configuration changes have occurred in the past
> few months.
>
> The only major change between the two upgrades is that I upgraded the
> upgrade programs (rather scary that this happens monthly) and some
tweaking
> on Lawson's config files, mostly to delivered settings. These settings
where
>
> tested with a single job in this upgrade and took about 1/2 the time to
> process. So I would have expected better performance this time, not worse.
>
> Any suggestions on where else to look for this bottle neck would be
greatly
> appreciated!
>
> -- 
> Mike Wills
> koldark@xxxxxxxxx
> http://mikewills.name
> Want Gmail? Email koldark+gmail@xxxxxxxxx to get on my waiting list.
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