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Subject: RE: OGSA-DAI system protection

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From: Ally Hume (a.hume@epcc.ed.ac.uk)
Date: Apr 05, 2006 15:28

Michael,

It seems that OGSA-DAI is running out of memory. You could try to
increase the memory allocated to the GT container but I suspect that
will simply allow you to run for a little longer rather than genuinely
solve the problem.

Can you tell us what exactly what you are doing so we can attempt to
reproduce this and hence diagnose it? What is the maximum memory you
have allocated to the GT4 container? Are you running anything other
than OGSA-DAI on this container?

What perform documents are you sending to OGSA-DAI? Are you creating
any sessions or anything else that would require state to be held in
the server between requests?

How many requests can you execute before this happens? Do you think
it is a function of how many requests you execute or how many days the
server has been running?

Regards,

Ally

-------------------------------------------------------------
Ally Hume
Software Architect
EPCC, University of Edinburgh
James Clerk Maxwell Building
Mayfield Road E-mail: a.hume@epcc.ed.ac.uk
Edinburgh, EH9 3JZ Phone: + 44 (0) 131 651 3397
United Kingdom Fax: + 44 (0) 131 650 6555
-------------------------------------------------------------

-----Original Message-----
From: owner-users@ogsadai.org.uk [mailto:owner-users@ogsadai.org.uk]
On Behalf Of Michael Sutter
Sent: 05 April 2006 14:16
To: users@ogsadai.org.uk
Subject: OGSA-DAI system protection

Hello all,

I have a problem when using OGSA-DAI WSRF 2.1 under GT 4.0.1
container.
After starting the container everything works fine when using the
SQLQuery Activity. The problem is, when running the server several
days
and query the database over OGSA-DAI several times I always get a
OGSA-DAI system protection exception as shown below. The only way to
get
OGSA-DAI working is stopping and restarting the GT4 container. After
restart everything works fine again, with equal SQL queries I used
when
I got the system protection exception, so the SQL queries are right.
The
same error occurs when using OGSA-DAI several times after restart, but
i
can't reproduce when the error appears.

I don`t know why this happens, if anybody has a idea please tell it to
me.

Thanks and Regards
Michael

2006-04-05 12:49:34,410 ERROR common.MemoryUtilities
[Thread-2598,<init>:36] OGSA-DAI system protection: Adding 0 bytes to
the Java stack may cause a java.lang.OutOfMemoryError
uk.org.ogsadai.common.exception.common.CommonSystemException: OGSA-DAI
system protection: Adding 0 bytes to the Java stack may cause a
java.lang.OutOfMemoryError
        at
uk.org.ogsadai.common.MemoryUtilities.checkMemory(MemoryUtilities.java
:159)
        at
uk.org.ogsadai.common.MemoryUtilities.checkMemory(MemoryUtilities.java
:59)
        at uk.org.ogsadai.activity.Activity.process(Activity.java:333)
        at
uk.org.ogsadai.activity.RequestProcessor.processActivity(RequestProces
sor.java:107)
        at
uk.org.ogsadai.activity.RequestProcessor.process(RequestProcessor.java
:76)
        at
uk.org.ogsadai.activity.ActivityPipelineRequestComponent.process(Activ
ityPipelineRequestComponent.java:107)
        at
uk.org.ogsadai.engine.controlflow.FlowRequestComponent.process(FlowReq
uestComponent.java:73)
        at
uk.org.ogsadai.activity.ActivityRequest$1.run(ActivityRequest.java:306
)
2006-04-05 12:49:34,412 ERROR activity.Activity
[Thread-2598,<init>:148] OGSA-DAI system protection: Adding 0 bytes to
the Java stack may cause a java.lang.OutOfMemoryError
2006-04-05 12:49:34,413 ERROR activity.Activity
[Thread-2598,setError:390] Error processing activity
ogsadai-10a69a9edb1 (uk.org.ogsadai.activity.ResultActivity) :
OGSA-DAI system protection: Adding 0 bytes to the Java stack may cause
a java.lang.OutOfMemoryError

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