[BangPypers] WSGI app instrumentation - middleware or other

[Anand Chitipothu]

2011/6/8 Noufal Ibrahim <noufal at gmail.com>:
> Sriram Narayanan <sriramnrn at gmail.com> writes:
>
>> Solaris, opensolaris, openindiana, freebsd, OSX.
>>
>> Also see crispeditor for dtrace on linux.
>
> [...]
>
> Interesting.
>
> I think it should be possible (and would be useful) to drop statistics
> obtained using dtrace into graphite (along with other things that dtrace
> can't do) so that you can a single uniform picture of what's going on.

I think it is too low-level tool to use for performance monitoring. It
might be good for some detailed introspection or troubleshooting. I
think the python profiler gives quite good information about where the
time is spent.

I use a special query parameter to dump the profiling information of
handling a single request using hotshot profiler.

http://openlibrary.org/lists?_profile=true

(scroll to the bottom to see the output of the profiler).

Anand