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From Darren Senel <darren.se...@gmail.com>
Subject Re: Memory Usage
Date Tue, 30 Jun 2009 12:45:32 GMT

Good morning Pinaki,

So our site spider had the effect we were looking for and out of our three
servers 1 crashed with an OOM, the other two survived but heap usage is
around 95% on them!  I ran the debug code on these two servers and the
results are that there was only 13 persistent classes listed with the same
classloader.

Here is the output from server for your validation:

[6/30/09 8:06:52:523 EDT] 000022f1 SystemOut     O
com.pwc.us.wcps.dto.BaseContentDTO loaded with classloader:
com.ibm.ws.classloader.CompoundClassLoader@714a714a
   Delegation Mode: PARENT_LAST
[6/30/09 8:06:52:523 EDT] 000022f1 SystemOut     O
com.pwc.us.wcps.dto.lists.RepeatedAttribute loaded with classloader:
com.ibm.ws.classloader.CompoundClassLoader@714a714a
   Delegation Mode: PARENT_LAST
[6/30/09 8:06:52:523 EDT] 000022f1 SystemOut     O
com.pwc.us.wcps.dto.DynamicCollectionDTO loaded with classloader:
com.ibm.ws.classloader.CompoundClassLoader@714a714a
   Delegation Mode: PARENT_LAST
[6/30/09 8:06:52:523 EDT] 000022f1 SystemOut     O
com.pwc.us.wcps.dto.PrimaryContentDTO loaded with classloader:
com.ibm.ws.classloader.CompoundClassLoader@714a714a
   Delegation Mode: PARENT_LAST
[6/30/09 8:06:52:523 EDT] 000022f1 SystemOut     O
com.pwc.us.wcps.dto.FriendlyURLDTO loaded with classloader:
com.ibm.ws.classloader.CompoundClassLoader@714a714a
   Delegation Mode: PARENT_LAST
[6/30/09 8:06:52:523 EDT] 000022f1 SystemOut     O
com.pwc.us.wcps.translations.TranslationDTO loaded with classloader:
com.ibm.ws.classloader.CompoundClassLoader@714a714a
   Delegation Mode: PARENT_LAST
[6/30/09 8:06:52:523 EDT] 000022f1 SystemOut     O
com.pwc.us.wcps.translations.VTranslationDTO loaded with classloader:
com.ibm.ws.classloader.CompoundClassLoader@714a714a
   Delegation Mode: PARENT_LAST
[6/30/09 8:06:52:523 EDT] 000022f1 SystemOut     O
com.pwc.us.wcps.dto.ConfigDTO loaded with classloader:
com.ibm.ws.classloader.CompoundClassLoader@714a714a
   Delegation Mode: PARENT_LAST
[6/30/09 8:06:52:523 EDT] 000022f1 SystemOut     O
com.pwc.us.wcps.dto.MigrationMasterDTO loaded with classloader:
com.ibm.ws.classloader.CompoundClassLoader@714a714a
   Delegation Mode: PARENT_LAST
[6/30/09 8:06:52:523 EDT] 000022f1 SystemOut     O
com.pwc.us.wcps.translations.SubgroupDTO loaded with classloader:
com.ibm.ws.classloader.CompoundClassLoader@714a714a
   Delegation Mode: PARENT_LAST
[6/30/09 8:06:52:523 EDT] 000022f1 SystemOut     O
com.pwc.us.wcps.translations.GroupDTO loaded with classloader:
com.ibm.ws.classloader.CompoundClassLoader@714a714a
   Delegation Mode: PARENT_LAST
[6/30/09 8:06:52:538 EDT] 000022f1 SystemOut     O
com.pwc.us.wcps.taxonomy.TaxonomyDTO loaded with classloader:
com.ibm.ws.classloader.CompoundClassLoader@714a714a
   Delegation Mode: PARENT_LAST
[6/30/09 8:06:52:538 EDT] 000022f1 SystemOut     O
com.pwc.us.wcps.dto.TerritoryDTO loaded with classloader:
com.ibm.ws.classloader.CompoundClassLoader@714a714a
   Delegation Mode: PARENT_LAST

I am assuming now we have to look at an alternative root cause?

Any ideas where to start looking?

Cheers

Darren


Darren Senel wrote:
> 
> Hi Pinaki,
> 
> I can output the debug lines on demand, so I will wait until memory is
> constrained and issue the command.  I'll let you know if there are more
> than 13 persistent classes registered and if there are more than one
> classloader displayed.
> 
> We have a bot spider the site at around 5:00pm today, which expedites the
> issue, so I should be able to let you know later today or tomorrow the
> results of this test.
> 
> Cheers
> 
> Darren
> 

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