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From "Jack Krupansky" <j...@basetechnology.com>
Subject Re: Low pause GC for java 1.6
Date Sun, 01 Jul 2012 16:37:26 GMT
To me, that suggests that you simply don't have enough JVM heap memory from 
the start. Maybe the nature of your schema and data results in a larger than 
expected use of heap from the start. Check JVM available memory/heap right 
after starting Solr, before any user queries, and then after doing a few 
queries. What are you actually doing during those 10 minutes? Are you doing 
lots of queries? Lots of document updates? Or... absolutely nothing? Maybe 
the warming queries are consuming the available heap. Maybe the field caches 
are consuming the heap? Do you have lots of facets with lots of unique 
values? Roughly how many documents and how many fields and how many facets 
are we talking about?

It would probably be more appropriate to respond to my inquiry over on the 
Solr user list and continue discussion there since there doesn't yet appear 
to be any evidence of a problem with Lucene/Solr itself.

-- Jack Krupansky

-----Original Message----- 
From: Bill Bell
Sent: Sunday, July 01, 2012 1:28 AM
To: dev@lucene.apache.org
Cc: <dev@lucene.apache.org>
Subject: Re: Low pause GC for java 1.6

It GC after about 10 minutes.

Bill Bell
Sent from mobile


On Jun 30, 2012, at 10:48 PM, "Jack Krupansky" <jack@basetechnology.com> 
wrote:

> Out of curiosity, how long does your Solr instance run before you hit a GC 
> issue? Minutes, hours, days? If reasonably long, maybe you simply need to 
> periodically take each Solr instance out of rotation and shut it down and 
> restart the JVM before any of them hit the GC issue.
>
> The first question is whether the GC delay is being caused because your 
> JVM heap is too small (thrashing) or too large (long GC elapsed time.)
>
> -- Jack Krupansky
>
> -----Original Message----- From: Bill Bell
> Sent: Saturday, June 30, 2012 8:48 PM
> To: Bill Bell
> Cc: dev@lucene.apache.org
> Subject: Re: Low pause GC for java 1.6
>
> Nothing?
>
> Bill Bell
> Sent from mobile
>
>
> On Jun 29, 2012, at 9:09 PM, Bill Bell <billnbell@gmail.com> wrote:
>
>> We are getting large Solr pauses on Java garbage collection in 1.6 Java.
>>
>> We have tried CMS. But we still have. 4 second wait on GC.
>>
>> What works well for Solr when using 16 GB of RAM?
>>
>> I have read lots of articles and now just looking for practical advise 
>> and examples.
>>
>> Sent from my Mobile device
>> 720-256-8076
>
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