On Jan 3, 2008 9:32 PM, Keith McGuigan <[EMAIL PROTECTED]> wrote:
> Matty wrote:
> > Howdy,
> >
> > I received the following error today when I attempted to run a DTrace
> > script that uses the Java hotspot provider:
> >
> > $ dtrace -s dbmethodprofile.d
> > dtrace: failed to compile script methods.d: line 15: probe description
> > :::method-entry does not match any probes
> >
> Not sure what your script is doing, but did you try writing it like this:
It was using a probe similar to the following:
hotspot*:::method-entry
/ ... /
{}
The script worked fine after I rebooted the server, so I don't think
the script is to blame.
> > The Java process that I was attempting to trace was started with the
> > "-XX:+DTraceMethodProbes" option, so the method-* probes should be
> > available. When I did a bit of digging, I noticed that the hotspot
> > probes were still enabled after the process exited:
> >
> > $ ps -ef | grep java
> > root 6988 6803 0 01:43:53 pts/1 0:00 grep java
> >
> > $ dtrace -l | grep hotspot |more
> > 3515 hotspot10316 libjvm.so
> > __1cTClassLoadingServiceTnotify_class_loaded6FpnNinstanceKlass_b_v_
> > clas
> > s-loaded
> > 3516 hotspot10316 libjvm.so
> > __1cTClassLoadingServiceVnotify_class_unloaded6FpnNinstanceKlass__v_
> > cla
> > ss-unloaded
> > 3517 hotspot10316 libjvm.so
> > __1cHnmethodbFpost_compiled_method_load_event6M_v_
> > compiled-method-load
> > 3518 hotspot10316 libjvm.so
> > __1cHnmethodbBpost_compiled_method_unload6M_v_ compiled-method-unload
> > 3519 hotspot10316 libjvm.so
> > __1cHnmethodbAmake_not_entrant_or_zombie6Mi_v_ compiled-method-unload
> > 3520 hotspot10316 libjvm.so
> > __1cVVM_ParallelGCSystemGCEdoit6M_v_ gc-begin
> > 3521 hotspot10316 libjvm.so
> > __1cbMVM_ParallelGCFailedPermanentAllocationEdoit6M_v_ gc-begin
> > 3522 hotspot10316 libjvm.so
> > __1cbDVM_ParallelGCFailedAllocationEdoit6M_v_ gc-begin
> > 3523 hotspot10316 libjvm.so __1cRVM_GenCollectFullEdoit6M_v_
> > gc-begin
> > 3524 hotspot10316 libjvm.so
> > __1cbAVM_GenCollectForAllocationEdoit6M_v_ gc-begin
> > < ..... >
> >
>
> What was the pid of the java process that went away? Could it be that a
> different process (10316) is running and providing those probes?
> libjvm.so and the hotspot provider aren't necessarily only linked to the
> 'java' executable - browsers and other launchers can load libjvm.so and
> this would register probes like this as well.
I am not 100% sure what the PID was, but I am certain there were no
Java processes running (at least according to ps). After I rebooted
the server, everything worked flawlessly. Unless anyone has any ideas,
I will open up a ticket with Sun support. This appears to be some sort
of bug.
Thanks,
- Ryan
--
UNIX Administrator
http://prefetch.net
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