Garbage Collection take long times.....

Question

*** NOTES 19-JUN-2001 10:27:33 [20-JUN-2001 00:27:33 ASST3] websupport
*** Logged by contact: Weber Wang, 2-87705935 ext. 63
Product Name and Version, including Service Pack (if any):
=============================================
weblogic6.0sp2
Platform (OS Version)
=================
solaris2.7
JDK Version (if applicable)
=====================
jdk130
If your problem relates to a 3rd party product (JDBC driver, database, or web/proxy
server), please provide vendor name, product name, version number
==============================================================================================
Detailed Problem Description
======================
we have set java parameter to start up weblogic server ,but got the Garbage Collection
time too long...it cause browser halt...when Garbage Collection
will do a Full GC?and will it degrade weblogic's performance?
java -server -verbose:class -verbose:gc -verbose:jni -XX:newSize=512m -XX:MaxNewSize=512m
-Xms768m -Xmx768m -XX:SurvivorRatio=2
Error Message/Stack Trace
=====================
[Full GC 65065K->27729K(65216K), 1.2891364 secs]
[Full GC 49079K->28008K(65216K), 1.0507784 secs]
[Full GC 65111K->29714K(65216K), 1.1813595 secs]
[Full GC 51063K->29988K(65216K), 1.0506374 secs]
[Full GC 64951K->27867K(65216K), 1.1312621 secs]
[Full GC 49216K->28146K(65216K), 1.0534394 secs]
[Full GC 65095K->29993K(65216K), 1.6070138 secs]
[Full GC 51343K->30182K(65216K), 1.3617954 secs]

Answer 1

I think your young generation size is waaaaay too high - its performance
impact becomes negative at or around 1/2 of the total heap size.
weber <[email protected]> wrote:
*** NOTES 19-JUN-2001 10:27:33 [20-JUN-2001 00:27:33 ASST3] websupport
*** Logged by contact: Weber Wang, 2-87705935 ext. 63
Product Name and Version, including Service Pack (if any):
=============================================
weblogic6.0sp2
Platform (OS Version)
=================
solaris2.7
JDK Version (if applicable)
=====================
jdk130
If your problem relates to a 3rd party product (JDBC driver, database, or web/proxy
server), please provide vendor name, product name, version number
==============================================================================================
Detailed Problem Description
======================
we have set java parameter to start up weblogic server ,but got the Garbage Collection
time too long...it cause browser halt...when Garbage Collection
will do a Full GC?and will it degrade weblogic's performance?
java -server -verbose:class -verbose:gc -verbose:jni -XX:newSize=512m -XX:MaxNewSize=512m
-Xms768m -Xmx768m -XX:SurvivorRatio=2
Error Message/Stack Trace
=====================
[Full GC 65065K->27729K(65216K), 1.2891364 secs]
[Full GC 49079K->28008K(65216K), 1.0507784 secs]
[Full GC 65111K->29714K(65216K), 1.1813595 secs]
[Full GC 51063K->29988K(65216K), 1.0506374 secs]
[Full GC 64951K->27867K(65216K), 1.1312621 secs]
[Full GC 49216K->28146K(65216K), 1.0534394 secs]
[Full GC 65095K->29993K(65216K), 1.6070138 secs]
[Full GC 51343K->30182K(65216K), 1.3617954 secs]--
Dimitri