GCViewer as Kai mentioned is a good one, I have used that and it gives you a good graphical view of when collections are happening. http://www.tagtraum.com/gcviewer.html
Makes it really easy to see when major GC's are happening :) It does have a real time view where you can watch it as it logs (but i've found that a bit buggy) alternatively you can just load a log file from several hours and just view that. Barry On Feb 4, 11:21 am, Kai Koenig <k...@koeni.de> wrote: > You have to log it on the JVM level or run a JVM monitoring tool. The memory > usage graph > in FR is a good first indicator but depending on your JVM settings GC might > be so minimal > that you won't be able to really tell what's going on. Without proper logging > you also won't > be able to tell if it's been a Full GC or which Generation had triggered it. > > Add something like this to your JVM args: > > -verbose:gc -Xloggc:mylogfile.log -XX:+PrintGCDetails -XX:+PrintGCTimeStamps > > Note, there are a lot more attributes that control the logging, just depends > on what you > want and need. > > Or look for tools like: > > VisualGC, GCViewer and a lot of others. They all basically help you with one > or the other > aspect, gain depends on what you want. > > Cheers > Kai > > On 4/02/2010, at 11:10 AM, Andrew Myers wrote: > > > > > Thanks Mark. > > > Is anyone able to please tell me how I can identify when garbage > > collection is happening? > > > On 4 February 2010 07:59, Mark Mandel <mark.man...@gmail.com> wrote: > >> Those are the threads in the thread pool waiting to be used. > > >> They aren't doing anything. > > >> Mark > > >> On Thu, Feb 4, 2010 at 12:05 AM, Andrew Myers <am2...@gmail.com> wrote: > > >>> Ummm....me again :-) > > >>> I'm seeing about 20 of these in my thread dump. Is anyone able to > >>> tell me if they anything to be concerned about? > > >>> Thread Stack Trace > >>> Trace Time: 23:35:12.743 03-Feb-2010 > >>> Thread ID: obj-skimmer > >>> Priority: 5 > >>> Hashcode: 22419531 > > >>> "obj-skimmer" daemon prio=5 tid=0x00a5a0a0 nid=0x99 in Object.wait() > >>> [0x9cb01000..0x9cb019c0] > >>> at java.lang.Object.wait(Native Method) > >>> - waiting on <0xbedddb30> (a > >>> coldfusion.server.j2ee.pool.PoolSkimmerThread) > >>> at > >>> coldfusion.server.j2ee.pool.PoolSkimmerThread.run(PoolSkimmerThread.java:47) > >>> - locked <0xbedddb30> (a > >>> coldfusion.server.j2ee.pool.PoolSkimmerThread) > >>> at java.lang.Thread.run(Thread.java:534) > > >>> -- > >>> You received this message because you are subscribed to the Google Groups > >>> "cfaussie" group. > >>> To post to this group, send email to cfaus...@googlegroups.com. > >>> To unsubscribe from this group, send email to > >>> cfaussie+unsubscr...@googlegroups.com. > >>> For more options, visit this group at > >>>http://groups.google.com/group/cfaussie?hl=en. > > >> -- > >> E: mark.man...@gmail.com > >> T:http://www.twitter.com/neurotic > >> W:www.compoundtheory.com > > >> Hands-on ColdFusion ORM Training @ cf.Objective() 2010 > >>www.ColdFusionOrmTraining.com/ > > >> -- > >> You received this message because you are subscribed to the Google Groups > >> "cfaussie" group. > >> To post to this group, send email to cfaus...@googlegroups.com. > >> To unsubscribe from this group, send email to > >> cfaussie+unsubscr...@googlegroups.com. > >> For more options, visit this group at > >>http://groups.google.com/group/cfaussie?hl=en. > > > -- > > You received this message because you are subscribed to the Google Groups > > "cfaussie" group. > > To post to this group, send email to cfaus...@googlegroups.com. > > To unsubscribe from this group, send email to > > cfaussie+unsubscr...@googlegroups.com. > > For more options, visit this group > > athttp://groups.google.com/group/cfaussie?hl=en. > > _________________________________________________ > Kai Koenig - Ventego Creative Ltd > ph: +64 4 476 6781 - mob: +64 21 928 365 / +61 450 132 117 > web:http://www.ventego-creative.co.nz > blog:http://www.bloginblack.de > twitter:http://www.twitter.com/agentK -- You received this message because you are subscribed to the Google Groups "cfaussie" group. To post to this group, send email to cfaus...@googlegroups.com. To unsubscribe from this group, send email to cfaussie+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/cfaussie?hl=en.
