Profiling Web.py apps

[Megha Vishwanath]

How does one go about this?

We have a web.py + wsgi + apache. And we'd want call graph profiling.

Warm Regards,

Megha 

[Jeffrey Zellman]

The simplest way would be to change app.run() to 

import cProfile

cProfile.run("app.run()")

Now when you hit ctrl+c from the terminal, the call graph will be printed.

If there is a particular function that you think is the culprit, you can always pass it into cProfile.run. For example, say there is a function in code.py called do_something, you could do the following from the python shell:

import code

import cProfile

cProfile.run("code.do_something()")

Check out the cProfile module though, since it supports dumping the profile info to a file which can be read with the pstats module: http://docs.python.org/2/library/profile.html#module-cProfile

Hope that helps,

Jeff

[Anand Chitipothu]

On Tue, Oct 22, 2013 at 5:25 AM, Megha Vishwanath <megha.vi...@gmail.com> wrote:

How does one go about this?

We have a web.py + wsgi + apache. And we'd want call graph profiling.

Did you look at web.profiler?

Anand

[Jeffrey Zellman]

Good call, forgot about that one!

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[Megha Vishwanth]

Will look at both these now. Thanks.

- Megha

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[Megha Vishwanath]

Anand, Jeffrey,

This is how i'm trying to use the web.profiler. Is this right? And if yes, where do I see the profile? I have a log file in the app and the apache log file, both of which didn't really have any indicators.

import web.utils

...

application = web.application(urls,globals(),web.profiler).wsgifunc()

Warm Regards,

Megha 

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[Anand Chitipothu]

On Wed, Oct 23, 2013 at 1:47 AM, Megha Vishwanath <megha.vi...@gmail.com> wrote:

Anand, Jeffrey,

This is how i'm trying to use the web.profiler. Is this right? And if yes, where do I see the profile? I have a log file in the app and the apache log file, both of which didn't really have any indicators.

import web.utils

...

application = web.application(urls,globals(),web.profiler).wsgifunc()

IIRC, it comes on the web page.

Anand

[Jeffrey Zellman]

It does display on the bottom of the web page however I don't think your syntax is quite right. web.profiler is a middleware so it should be passed to run (and potentially wsgifunc, can't confirm since I can't test wsgifunc). This should work though:

application =  web.application(urls,globals())

if __name__ == "__main__":

    application.run(web.profiler)

and in theory, this should work:

application = web.application(urls,globals()).wsgifunc(web.profiler)

Jeff