A way to force gc for the JVM automatically/programatically

Question

Hi,
I understand how to force a garbage collection for the JVM in the weblogic console
manually, but I am looking for a way of setting it to do a gc autmatically
for the JVM at set intervals.

Answer 1

Ahh...exactly what I am looking for...the command line admin commands will do the
trick...Thank you.
<[email protected]> wrote:
Greetings,
I certainly think its not a very good idea to be calling System.gc()
directly.
you could do it by calling the JMX Mbeans exposed by
WLS.
You could programatically invoke thos MBeans (refer tothe WLS docs about
MBeans..)
Or to give you an example you could do it from command line as :
rem Following command to get the Free Heap
java weblogic.Admin -url %1 -username system -password xxx GET -pretty
-type
JVMRuntime -property HeapFreeCurrent
rem Following command to get the Current Heap
java weblogic.Admin -url %1 -username system -password xxx GET -pretty
-type
JVMRuntime -property HeapSizeCurrent
rem Following command to run GC
java weblogic.Admin -url %1 -username system -password xxx
INVOKE -pretty -type JVMRuntime -method getAttributeStringValue runGC
"Mark Officer" <[email protected]> wrote in message
news:[email protected]..
To answer your question, I am trying to measure what the steady stateof
memory
usage is per user. This is not for a production system or tuning.
Reg/ the System.gc()...I am aware this method, but how would I do thisgc
for
the weblogic java instance? Maybe this is my own ignorance of Java.
Rob Woollen <[email protected]> wrote:
You could do this by writing a class that uses the timer service to
receive periodic callbacks. In the callback handler, call System.gc();
That being said, why do you want to do this? If anything this will
most
likely decrease your performance.
-- Rob
Mark Officer wrote:
Hi,
I understand how to force a garbage collection for the JVM in the
weblogic
console
manually, but I am looking for a way of setting it to do a gc
autmatically
for the JVM at set intervals.