Unnaturally high cpu and memory usage

Hello.
I have installed WL 6.1 and WL Portal 4.0 on a w2k machine. It has a
800 cpu (I think), and 512 RAM.
What happens is: After server startup, everything is low and nice. But
after a few jsp compilations, the cpu jumps to 100% and stays there,
even after the page has been returned and the browser says "done".
Actually, memory usage isn't that high; the java process is using
about 50 megs of memory. But it has exceeded this a couple of times,
and used 200+ MB.
The database is also running on another machine.
I tried deploying the same application on a locally installed
WL/Portal, and the same thing happened, only with much more memory
usage, about 200 - 250 megs. My machine became useless, and I had to
shut down the server.
What is causing this? Is the server's configuration totally screwed,
or can some code be doing this? Btw, I know I am the only user on this
server...
On other threads here, I have seen people supplying server dumps of
processes etc. How do I see this dump, or what processes within the
server are running?
I am very grateful for any help with this.
Christer

Take a thread dump of the server. You should at least be able to see
what it's doing.
On UNIX, you can send a SIGQUIT. (ie kill -3 the process)
On Windows, you can CTRL-BREAK in the window.
If you search for thread dump on edocs.bea.com, you should see a full
explanation.
Also, these groups can be searched on groups.google.com.
-- Rob
Christer Brinchmann wrote:
Hello.
I have installed WL 6.1 and WL Portal 4.0 on a w2k machine. It has a
800 cpu (I think), and 512 RAM.
What happens is: After server startup, everything is low and nice. But
after a few jsp compilations, the cpu jumps to 100% and stays there,
even after the page has been returned and the browser says "done".
Actually, memory usage isn't that high; the java process is using
about 50 megs of memory. But it has exceeded this a couple of times,
and used 200+ MB.
The database is also running on another machine.
I tried deploying the same application on a locally installed
WL/Portal, and the same thing happened, only with much more memory
usage, about 200 - 250 megs. My machine became useless, and I had to
shut down the server.
What is causing this? Is the server's configuration totally screwed,
or can some code be doing this? Btw, I know I am the only user on this
server...
On other threads here, I have seen people supplying server dumps of
processes etc. How do I see this dump, or what processes within the
server are running?
I am very grateful for any help with this.
Christer

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Hi guys,
I am encountering huge user response time on a production system and I don’t know how to solve it.
Doing some extra tests and using the instrumentation that we have in the code we concluded that the DB is the bottleneck.
We generated some AWR reports and noticed the CPU was in top wait events. Also noticed that in a random manner some simple sql take a long time to execute. We activated the sql trace on the system and noticed that for very simple SQLs (unique index access on one table) we have huge exec times. 9s
In the trace file the huge time we had it in fetch area: 9.1s cpu and elapsed 9.2.
And no or very small waits for this specific SQL.
it seems like the bottle neck is on the CPU but at that point there were very few processes running on the DB. Why can we have such a big cpu wait on a simple select? This is a machine with 128 cores. We have quicker responses on machines smaller/busier than this.
We noticed that we had a huge db_cache_size (12G) and after we scale it down we noticed some improvements but not enough. How can I prove that there is a link between high CPU and big cache_size? (there was not wait involved in SQL execution). what can we do in the case we need big DB cache size?
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call     count       cpu    elapsed       disk      query    current        rows
Parse        1      0.00       0.00          0          0          0           0
Execute      1      0.00       0.00          0          0          0           0
Fetch        1    402.08    1038.31    1842916    6174343          0           1
total        3    402.08    1038.32    1842916    6174343          0           1
db file sequential read                     12419        0.21         40.02
i/o slave wait                             135475        0.51        613.03
db file scattered read                     135475        0.52        675.15
log file switch completion                      5        0.06          0.18
latch: In memory undo latch                     6        0.00          0.00
latch: object queue header operation            1        0.00          0.00
********************************************************************************The high CPU is present here also but here I have huge wait on db file scattered read.
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I though this is an IO issue. I did some IO tests at SO level and it seems like the read and writes operation are very fast…much faster than the machine that has the awg_wait smaller. Why the difference in waits?
One difference between these two DBs is that the problem one has the db block size = 16k and the other one has 8k.
I received some reports done at OS level on CPU and IO usage on the problematic machine (in normal operations). It seems like the CPU is very used and the IO stays very low.
On the other machine, the smaller and the faster one, it is other way around.
What is the problem here? How can I test further? Can I link the high CPU to low/slow IO?
we have 10G on sun os with ASM.
Thanks in advance.

Yes, there are many things you can and should do to isolate this. But first check MOS Poor Performance With Oracle9i and 10g Releases When Using Dynamic Intimate Shared Memory (DISM) [ID 1018855.1] isn't messing you up to start.
Also, be sure and post exact patch levels for both Oracle and OS.
Be sure and check all your I/O settings and see what MOS has to say about those.
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Now that that is all out of the way, if you still haven't found the problem, go through http://oracle-randolf.blogspot.com/2009/02/basic-sql-statement-performance.html
Edit: Oh, see Solaris 10 memory management conflicts with Automatic PGA Memory Management [ID 460424.1] too.
Edited by: jgarry on Nov 15, 2011 1:45 PM

Unnaturally high cpu and memory usage

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