robert rottermann wrote at 2007-9-21 09:11 +0200:
does the installation of ZopeProfiler have a noticable performance
impact when it is disabled?
No.
ZopeProfiler monkey patches ZPublisher.publish_module
with the following function:
def _profilePublishModule(
module_name, stdin=sys.stdin, stdout=sys.stdout,
stderr=sys.stderr, environ=environ, debug=0,
request=None, response=None
):
lock= _lock # to facilitate refreshing
psrc= request or environ; path= psrc.get('PATH_INFO')
if _enabled and _doProfile(path):
... code only executed when the profiler is enabled ...
else:
result= publish_module(
module_name, stdin=stdin, stdout=stdout,
stderr=stderr, environ=environ, debug=debug,
request=request, response=response)
return result
As you can see:
The overhead when ZopeProfiler is disabled is
* an extra function call
* 3 assignments
* a request lookup
* a boolean check
In total: negligable compared to what the ZPublisher (not speaking
about Zope at all) is doing otherwise.
--
Dieter
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