The very first OOM in 2011

Here is how my first OOM of 2011 being detected:

2011/01/04, 2PM:
My defualt JVM setting:

 
...
 wrapper.java.additional.5=-server  
 wrapper.java.additional.6=-Xss128k  
 wrapper.java.additional.7=-Xms1536m  
 wrapper.java.additional.8=-Xmx1536m  
 wrapper.java.additional.9=-XX:MaxPermSize=64m  
 wrapper.java.additional.10=-Xmn512m  
 wrapper.java.additional.11=-XX:ParallelGCThreads=5  
 wrapper.java.additional.12=-XX:+UseConcMarkSweepGC  
...

2011/01/04, 2:01PM:
Changes from -Xmn=512m to -XX:NewRatio=2

 
...
 wrapper.java.additional.5=-server  
 wrapper.java.additional.6=-Xss128k  
 wrapper.java.additional.7=-Xms1536m  
 wrapper.java.additional.8=-Xmx1536m  
 wrapper.java.additional.9=-XX:MaxPermSize=64m  
 wrapper.java.additional.10=-XX:NewRatio=2  
 wrapper.java.additional.11=-XX:ParallelGCThreads=5  
 wrapper.java.additional.12=-XX:+UseConcMarkSweepGC  
...

2011/01/04, 2:10PM:
Load testing running, OOM happened:

 INFO  | jvm 1  | 2011/01/03 23:24:13 | 2011-01-03 23:24:13, 19560420@qtp-9708927-58, ERROR, com.XXX.XXXXX.concept.ConceptMetadataServlet - ConceptMetadataServlet.doGet() exception  
 INFO  | jvm 1  | 2011/01/03 23:24:13 | java.lang.OutOfMemoryError  
 INFO  | jvm 1  | 2011/01/03 23:24:13 |      at java.util.zip.Deflater.init(Native Method)  
 INFO  | jvm 1  | 2011/01/03 23:24:13 |      at java.util.zip.Deflater.<init>(Deflater.java:123)  
 INFO  | jvm 1  | 2011/01/03 23:24:13 |      at java.util.zip.GZIPOutputStream.<init>(GZIPOutputStream.java:46)  
 INFO  | jvm 1  | 2011/01/03 23:24:13 |      at org.mortbay.servlet.GzipFilter$GzipStream.doGzip(GzipFilter.java:525)  
 INFO  | jvm 1  | 2011/01/03 23:24:13 |      at org.mortbay.servlet.GzipFilter$GzipStream.<init>(GzipFilter.java:417)  
 INFO  | jvm 1  | 2011/01/03 23:24:13 |      at org.mortbay.servlet.GzipFilter$GZIPResponseWrapper.newGzipStream(GzipFilter.java:392)  
 INFO  | jvm 1  | 2011/01/03 23:24:13 |      at org.mortbay.servlet.GzipFilter$GZIPResponseWrapper.getOutputStream(GzipFilter.java:342)  
....
NFO   | jvm 1    | 2011/01/03 23:24:14 | #
INFO   | jvm 1    | 2011/01/03 23:24:14 | # A fatal error has been detected by the Java Runtime Environment:
INFO   | jvm 1    | 2011/01/03 23:24:14 | #
INFO   | jvm 1    | 2011/01/03 23:24:14 | # java.lang.OutOfMemoryError: requested 87744 bytes for Chunk::new. Out of swap space?
INFO   | jvm 1    | 2011/01/03 23:24:14 | #

2011/01/04, 2:20PM:

reproduced OOM again, exactly the same one...

2011/01/04, 2:30PM:

buy some drink and continue to do the search on the web

2011/01/04, 2:36PM:

Search keywords:java.lang.OutOfMemoryError, org.mortbay.servlet.GzipFilter$GzipStream.doGzip
It is said to be a Known issue; and it is tagged as fixed already in Jetty version 6.1.23

2011/01/04, 2:45PM:

Changes back from -XX:NewRatio=2 to -Xmn=512m
No OOM happens again after a few rounds of tests....
An idea comes into my mind: "NewRatio seems to be another Factor to this OOM?!"

2011/01/04, 3:25PM:

Search KeyWords: NewRatio, Out of swap space
Another Known issue being stamped: "-XX:NewRatio completely ignored when combined with -XX:+UseConcMarkSweepGC"
Also a Regression bug after above issue is said to be "fixed"

Happy New Year!!