On Thu, Jul 24, 2014 at 5:10 AM, skele...@lissyara.su via dtrace-discuss <
dtrace-discuss@lists.dtrace.org> wrote:
>
>
>> I probably won’t explain this correctly, but because of lazy loading you
>> first need to fire the probes before they will be visible. After
>> starting the Java process run:
>>
>> dtrace -n ‘hotspot*::: { @[probename] = count(); }’
>>
>> Then you should be able to list all the probes.
>>
>> Here is an old thread on dtrace-discuss talking about lazy loading of
>> probes:
>>
>> https://www.mail-archive.com/dtrace-discuss@opensolaris.org/msg03853.html
>>
>> Oh, and here is another one claiming lazy loading was added in in JDK
>> 1.6.0u25:
>>
>> http://thr3ads.net/dtrace-discuss/2011/07/1132880-
>> Question-about-application-supplied-probes-and-tracking-the-impact
>>
>> -Z
>>
>
> Of course, I try it when application is running. Here is ouput:
>
>
> # ps -efc | grep java
> root 2398 1186 TS 49 12:05:28 pts/2 0:00 grep java
> root 1050 1 TS 59 Jul 21 ? 8:19 /bin/java -Xms256m
> -Xmx1g -Xss256k -Djava.awt.headless=true -XX:+UseParNewGC -X
>
> # pargs 1050 | grep -i dtrace
>
> argv[7]: -XX:+ExtendedDTraceProbes
> argv[8]: -XX:+DTraceMethodProbes
> argv[9]: -XX:+DTraceAllocProbes
> argv[10]: -XX:+DTraceMonitorProbes
>
> # dtrace -n 'hotspot*::: { @[probename] = count(); }'
> dtrace: invalid probe specifier hotspot*::: { @[probename] = count(); }:
> probe description hotspot*::: does not match any probes
>
> So, lazy loading doesn't blame here.
>
>
>
Can you try
# dtrace -n hotspot1050:::'{@[probename]=count()}'
This seems to work for me on 1.7.0_55
-Angelo
>
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