If you're using java 5 or 6 jmap is a useful tool in tracking down
memory leaks.
http://java.sun.com/javase/6/docs/technotes/tools/share/jmap.html
jmap -histo:live <pid>
will print a histogram of all live objects in the heap. Start at the
top and work your way down until you find something suspicious -- the
trick is in knowing what is suspicious of course.
-Bryan
On Apr 16, 2009, at Apr 16, 3:40 PM, David Baker wrote:
Otis Gospodnetic wrote:
Personally, I'd start from scratch:
-Xmx.... -Xms...
-server is not even needed any more.
If you are not using Java 1.6, I suggest you do.
Next, I'd try to investigate why objects are not being cleaned up -
this should not be happening in the first place. Is Solr the only
webapp running?
Otis
--
Sematext -- http://sematext.com/ -- Lucene - Solr - Nutch
----- Original Message ----
From: David Baker <dav...@mate1inc.com>
To: solr-user@lucene.apache.org
Sent: Thursday, April 16, 2009 3:33:18 PM
Subject: Garbage Collectors
I have an issue with garbage collection on our solr servers. We
have an issue where the old generation never gets cleaned up on
one of our servers. This server has a little over 2 million
records which are updated every hour or so. I have tried the
parallel GC and the concurrent GC. The parallel seems more stable
for us, but both end up running out of memory. I have increased
the memory allocated to the servers, but this just seems to delay
the problem. My question is, what are the suggested options for
using the parallel GC. Currently we are using something of this
nature:
-server -Xmx4096m -Xms512m -XX:+UseAdaptiveSizePolicy -XX:
+UseParallelOldGC -XX:GCTimeRatio=19 -XX:NewSize=128m -
XX:SurvivorRatio=2 -Dsolr.solr.home=/usr/local/solr-tomcat-fi/solr
I am new to solr and GC tuning, so any advice is appreciated.
Thanks for the reply, yes, solr is the only app running under this
tomcat server. I will remove -server, and other options except the
heap allocation options and see how it performs. Any suggestions on
how to go about finding out why objects are not being cleaned up if
these changes dont work?
