Re: missing Java method information in operf profile

On 08/25/2014, Maynard Johnson wrote:
> On 08/25/2014 01:01 PM, Brian Hall wrote:
>> I'm running the operf from AT 7.0-5 on a POWER8 system:
>>   # /opt/at7.0/bin/operf -v
>>   /opt/at7.0/bin/operf: oprofile 1.0.0git compiled on Jul 24 2014
13:49:08
>> using the command (as root):
>>   /opt/at7.0/bin/operf --events PM_RUN_CYC:10290000 --separate-thread
--separate-cpu --system-wide
>>
>> There are 14 active JVM processes running on the system that I am trying
to profile.  For some reason, the profiles only contain full JIT compiler
method information for 2 or 3 of the processes (it varies across different
runs).  I have checked that the agentlib option is being correctly passed
to the JVMs, and that the JIT dump files for all 14 processes are available
in /tmp/.oprofile/jitdump at the time that operf is run.
>>
>> A casual look at verbose output from operf didn't indicate any problems
in accessing the JIT dump files, it just didn't try to process all of them.
I tried adding --lazy-conversion to the operf options, and that run did
show an issue at the end of the verbose output:
>>   add sym: name=Ljava/utilchild received signal 9
>Hi, Brian,
>This sounds similar to a problem that was reported on this list on July 30
by Andrew Haley regarding an ill-advised hard-coded timeout.  Andrew's
problem has been fixed upstream now, but if you were running into that
exact problem, using --lazy-conversion would have resolved it.  Looking at
the code now, I see there is a second hard-coded timeout.  The one I got
rid of was where the main operf thread is waiting for the oper_read_pid to
finish.  There's another one, where the operf_read_pid is waiting for yet
another process to finish . . .  which was started via exec to do the JIT
dump conversion.  The timeout for the actual JIT dump conversion is 2
seconds. It appears you've hit that limit.
>
>I'm attaching a patch that should resolve this, if you could please test
it.
>

Hi Maynard,
The patch worked perfectly, with or without --lazy-conversion.  Thanks!
Brian

>Thanks.
>-Maynard
>>
>> Brian

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