[dtrace-discuss] Dtrace for multithread debugging

[Andreas.Haas at Sun.COM]

Hi Wynne,

under

    http://wiki.gridengine.info/wiki/index.php/Dtrace

there is a description of a monitoring utility that collects and prints 
performance indices of a multi-process + multi-threaded daemon (pure C) 
component that bases solely on Dtrace pid-provider. Despite the caveat 
that traced functions may not have been inlined by the compiler, it works 
quite well, because function inlining can almost always be prevented with 
corresponding #pragma compliler directives.

Already having this monitoring utility helped me to find lots of bugs
that had been hard to find otherwise. In addition there are also cases
where I customize the D-script as to debug deeper into bugs where timing 
conditions play a role somehow.

Regards,
Andreas

PS: The wiki document also contains a link where you could download the
deamon monitor for a version of our product where the monitor was not 
yet part of our regular distribution. Reason for making it part of our
distribution was the need to have the monitor available on-site.

On Wed, 7 May 2008, Lally Singh wrote:

> Hmm, my first reflex would be to look into speculative tracing,
> triggered by the conditions that may trigger the bug.
>
> On Wed, May 7, 2008 at 4:29 AM, Wynne Wang <Wynne.Wang at sun.com> wrote:
>> Hi
>>
>>   It seems dtrace is the recommended tool for tracing C/C++ multithread app.
>>
>>   But any Guide Line/example/Blogs for dtrace in debuging multithread app?
>>   It seems we could trace some current thread struct, tid. But how to use it to
>>   find the  bug inside?
>>
>>   Any guide will be appreciated.
>>
>>   Regards
>>
>>   Wynne
>>
>>
>>  _______________________________________________
>>  dtrace-discuss mailing list
>>  dtrace-discuss at opensolaris.org
>>
>
>
>
> -- 
> H. Lally Singh
> Ph.D. Candidate, Computer Science
> Virginia Tech
> _______________________________________________
> dtrace-discuss mailing list
> dtrace-discuss at opensolaris.org
>

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