Has anyone used JVM argument -XX:+UseG1GC for garbage collection on ColdFusion?

[Peter 456]

I am hesitant to try to change the JVM Arguments. In the past ColdFusion has failed to restart for me when I changed them. Any advice would be welcome.

[carl type3]

Yes Peter have one site running G1GC garbage first collector. Suggest perform some logging or monitoring to know altering GC has good or bad impact.

With G1GC allow for the heap to be much larger, it would be fair to say it is more memory persistent than PARALLELGC which is effective at keeping the heap evacuated. Example JVM args only, where this may work well with PARALLELGC:

-Xmx4096 -XX:+UseParallelGC

this may suit better with G1GC given same load:

-Xmx8192 -XX:+UseG1GC

As always take a copy of your JVM.CONFIG before changes so you got a backup.

HTH, Carl.

PS you might like these references

http://docs.oracle.com/javase/7/docs/technotes/guides/vm/G1.html

http://www.oracle.com/technetwork/java/javase/tech/g1-intro-jsp-135488.html

http://download.oracle.com/javase/7/docs/technotes/guides/vm/G1.html

http://www.oracle.com/technetwork/java/javase/tech/vmoptions-jsp-140102.html

[carl type3]

Hi Peter,

You may find this reference interesting:

http://www.oracle.com/webfolder/technetwork/tutorials/obe/java/G1GettingStarted/index.html

Regards, Carl.