Andreas Jung ha scritto:



--On 3. Juli 2006 15:38:58 +0200 Claudio Battaglino <[EMAIL PROTECTED]> wrote:

Jens Vagelpohl ha scritto:


Could it be that, using a Python expression, I have an overhead because
Zope loads a Python interpreter each time it finds a "python:"?
If this is true then it is better to use path expression, if possible.


nah....Python expression are executed in a sandbox (RestrictedPython) which will introduce additional overhead..but let numbers speak...write a loop in TAL and compare the performance of path expressions vs. python expressions... don't guess, but measure...

-aj

It seems that the Python Expression works a bit better:

To the test this, I used these two Page Templates and PTProfiler:

PATH EXPRESSION <div tal:define="test_user here/portal_membership/getAuthenticatedMember" tal:repeat="counter python:range(5000)">
     <span tal:content="test_user/getId" />
   </div>

PYTHON EXPRESSION
   <div tal:define="test_user here/portal_membership/getAuthenticatedMember" 
tal:repeat="counter python:range(5000)">
     <span tal:content="python: test_user.getId()" />
   </div>

PATH EXPRESSION Expression - Total time - Number of calls - Time per call
path: test_user/getId   0.72    5000    0.00014
path: test_user/getId   0.63    5000    0.00013
path: test_user/getId   0.72    5000    0.00014

path: test_user/getId   4.0     50000   8e-05
path: test_user/getId   4.09    50000   8e-05
path: test_user/getId   4.12    50000   8e-05

PYTHON EXPRESSION
Expression - Total time - Number of calls - Time per call
python: test_user.getId()       0.6     5000    0.00012
python: test_user.getId()       0.51    5000    0.0001
python: test_user.getId()       0.48    5000    0.0001
python: test_user.getId()       3.19    50000   6e-05
python: test_user.getId()       3.42    50000   7e-05
python: test_user.getId()       2.96    50000   6e-05

Is it a  significant test?

claudio :-)

_______________________________________________
Zope maillist  -  Zope@zope.org
http://mail.zope.org/mailman/listinfo/zope
**   No cross posts or HTML encoding!  **
(Related lists - http://mail.zope.org/mailman/listinfo/zope-announce
http://mail.zope.org/mailman/listinfo/zope-dev )

Reply via email to