[ZODB-Dev] profiling zLOG and inspect

[Andreas Jung]

Why is the time needed to do some imports important for a running
Zope application? Since all imports are done during the startup phase,
I would not really care about it too much.

-aj

--On Samstag, 14. Juni 2003 22:03 Uhr -0300 Christian Reis 
<kiko at async.com.br> wrote:

>
> Hi there,
>
> we're approaching the final release of one of our client projects, and
> I've started to do some weekend profiling to see if I can shave some
> time off here and there.
>
> My 2.1/2.2 profile runs are showing me that the import zLOG step is
> taking a bit less than 1 second on some of the slower boxes here
> (400~500mhz). In the end, it piles down to the fact that import inspect
> takes an amazingly long time:
>
>     kiko at banzai:~/ZODB3/ZODB$ python2.1
>     Python 2.1.3 (#1, Sep  7 2002, 15:29:56)
>     [GCC 2.95.4 20011002 (Debian prerelease)] on linux2
>     Type "copyright", "credits" or "license" for more information.
>     You have pprint, _halt, class Foo Bar:Foo available"
>     To call _halt, use _halt(locals())
>     >>> import time; t = time.time() ; import inspect ; time.time() - t
>     0.76367998123168945
>
>     kiko at banzai:~/ZODB3/ZODB$ python2.2
>     Python 2.2.1 (#1, Sep  7 2002, 14:34:30)
>     [GCC 2.95.4 20011002 (Debian prerelease)] on linux2
>     Type "help", "copyright", "credits" or "license" for more information.
>     You have pprint, _halt, class Foo Bar:Foo available"
>     To call _halt, use _halt(locals())
>     >>> import time; t = time.time() ; import inspect ; time.time() - t
>     0.49863600730895996
>
> I know that zLOG will only actually output something if EVENT_LOG_* are
> set. What's the opinion of avoiding the zLOG import, and nopping out the
> calls to zLOG.register_subsystem and zLOG.LOG when these environment
> variables are set?
>
> I realize that in 2.3 things are much better, but I can't run 2.3 on the
> client environment; I suppose others are in a similar spot, and 1s of
> import time in worst-case scenarios isn't something to sneeze at.
>
> (As a parting note, the whole ZODB import takes an amazingly long time:
>     >>> import time; t = time.time() ; import ZODB ; time.time() - t
>     1.7814439535140991
> so I suppose getting that number down would be highly welcome)
>
> Take care,
> --
> Christian Reis, Senior Engineer, Async Open Source, Brazil.
> http://async.com.br/~kiko/ | [+55 16] 261 2331 | NMFL
>
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> http://www.zope.org/Wikis/ZODB/
>
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