Have you tried the VisualVM-Sampler plugin ? It also does profiling, slightly less accurate than the default profiling, but starts immediately.
On Tue, Feb 15, 2011 at 20:37, agile.j...@gmail.com <agile.j...@gmail.com>wrote: > I have tried to use visualvm to profile it,but can't find more than > the "vm thread " is the CPU killer. > Thanks. > > On Wednesday, February 16, 2011, Jan Goyvaerts <java.arti...@gmail.com> > wrote: > > Nope. But have a look with Visualvm ( it's the executable "jvisualvm" in > $JAVA_HOME/bin), right click on the process and ask for a thread dump. There > you'll see what it is doing. Or profile it with the Sampler plugin. > > > > > > What's a bit unusual is that it's root who's running this process... > > > > On Tue, Feb 15, 2011 at 20:17, agile.j...@gmail.com < > agile.j...@gmail.com> wrote: > > hi: > > I found a java process whose cpu is almost 100% at my notebook. > > > > > > Here is the top output: > > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ > > 6150 root 20 0 1411m 612m 12m R 98.8 15.7 45:49.12 > > and the jstack output for thread 6150(0x1806):"VM Thread" prio=10 > tid=0x0000000040ca9000 nid=0x1806 runnable > > > > > > > > the last is jstat -gc output: > > S0C S1C S0U S1U EC EU OC OU PC > PU YGC YGCT FGC FGCT GCT 64.0 64.0 0.0 0.0 > 332992.0 0.0 666304.0 73192.5 83968.0 83967.9 6893 17.576 6882 > 2705.923 2723.499 > > > > > > > > I don't know what the "VM Thread" is doing all the time. > > Some peopel encounter the same problem? > > Here is my enviromen: > > > > Jvm: > > java version "1.6.0_23"Java(TM) SE Runtime Environment (build > 1.6.0_23-b05)Java HotSpot(TM) 64-Bit Server VM (build 19.0-b09, mixed mode) > > OS: > > > > > > Linux 2.6.35-26-generic #46-Ubuntu SMP Sun Jan 30 06:59:07 UTC 2011 > x86_64 GNU/Linux > > Thanks. > > > > -- > > d0ngd0ng > > > > > > > > > > -- > > You received this message because you are subscribed to the Google Groups > "The Java Posse" group. > > To post to this group, send email to javaposse@googlegroups.com. > > To unsubscribe from this group, send email to > javaposse+unsubscr...@googlegroups.com. > > For more options, visit this group at > http://groups.google.com/group/javaposse?hl=en. > > > > > > > > > > > > -- > > You received this message because you are subscribed to the Google Groups > "The Java Posse" group. > > To post to this group, send email to javaposse@googlegroups.com. > > To unsubscribe from this group, send email to > javaposse+unsubscr...@googlegroups.com. > > For more options, visit this group at > http://groups.google.com/group/javaposse?hl=en. > > > > -- > d0ngd0ng > > -- > You received this message because you are subscribed to the Google Groups > "The Java Posse" group. > To post to this group, send email to javaposse@googlegroups.com. > To unsubscribe from this group, send email to > javaposse+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/javaposse?hl=en. > > -- You received this message because you are subscribed to the Google Groups "The Java Posse" group. To post to this group, send email to javaposse@googlegroups.com. To unsubscribe from this group, send email to javaposse+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/javaposse?hl=en.
