From: Armin R. <ar...@ul...> - 2002-03-01 16:21:46
|
Hello everybody, The first beta version of Psyco is released, with Windows and Linux binaries, for Python 2.1 and 2.2. Any feedback welcome! http://sourceforge.net/projects/psyco/ Thanks, Armin. |
From: Andreas J. <an...@zo...> - 2002-03-01 16:56:45
|
Just run ab against a Zope 2.5.0 instance and tested the performance against a stupid PythonScript. Results: without psyco: 116 requests/second with psyco: 33 requests/second Jup, Zope is about 3.5 times slower *with* psyco. Any explanations for this worse behaviour ? Andreas ----- Original Message ----- From: "Armin Rigo" <ar...@ul...> To: <psy...@li...> Cc: <zop...@zo...>; <pyt...@py...> Sent: Friday, March 01, 2002 11:21 Subject: [Zope-Coders] Psyco release 0.4.0 > Hello everybody, > > The first beta version of Psyco is released, with Windows and Linux > binaries, for Python 2.1 and 2.2. Any feedback welcome! > > http://sourceforge.net/projects/psyco/ > > > Thanks, > > Armin. > > > _______________________________________________ > Zope-Coders mailing list > Zop...@zo... > http://lists.zope.org/mailman/listinfo/zope-coders > |
From: Petru P. <pp...@pp...> - 2002-03-01 20:42:42
|
On Fri, 2002-03-01 at 18:56, Andreas Jung wrote: > Just run ab against a Zope 2.5.0 instance and tested > the performance against a stupid PythonScript. > > Results: > > without psyco: 116 requests/second > with psyco: 33 requests/second > > Jup, Zope is about 3.5 times slower *with* psyco. > Any explanations for this worse behaviour ? Just a wild, wild guess: this could be related to Psyco not doing the regular interval polling, so PyThreadState_Swap() doesn't get called as often as it should, ZServer piles up requests, the worker threads get starved, and so on. -- Petru Paler, http://www.ppetru.net |
From: Paul E. <pa...@zo...> - 2002-03-01 21:26:43
|
If that's true, then the command-line speed test should show a speedup (rather than running ab against the server). Another useful test: the zodb load test. --Paul Petru Paler wrote: > On Fri, 2002-03-01 at 18:56, Andreas Jung wrote: > >>Just run ab against a Zope 2.5.0 instance and tested >>the performance against a stupid PythonScript. >> >>Results: >> >>without psyco: 116 requests/second >>with psyco: 33 requests/second >> >>Jup, Zope is about 3.5 times slower *with* psyco. >>Any explanations for this worse behaviour ? >> > > Just a wild, wild guess: this could be related to Psyco not doing the > regular interval polling, so PyThreadState_Swap() doesn't get called as > often as it should, ZServer piles up requests, the worker threads get > starved, and so on. > > |
From: Armin R. <ar...@ul...> - 2002-03-10 18:00:08
|
Hello Petru, ----- Original Message ----- > > Jup, Zope is about 3.5 times slower *with* psyco. > > Any explanations for this worse behaviour ? > > Just a wild, wild guess: this could be related to Psyco not doing the > regular interval polling, so PyThreadState_Swap() doesn't get called as > often as it should, ZServer piles up requests, the worker threads get > starved, and so on. Morten's results give a more interesting answer. He went from a serious slowdown to a 2x speed-up by replacing psyco.jit() with psyco.bind() on a pair of classes. So the problem probably stands in the just-in-time rebinder, psyco.jit(). Not only does it add a constant profiling-like overhead (significantly more important in Python 2.1 than 2.2, by the way), but I believe that there are quite a few problems with its current approach. Would someone please make another check on Zope+Psyco without using psyco.jit() ? A few carefully selected psyco.bind() could give quite more positive speed-ups. I don't know exactly *how* to select what to bind, however. Maybe testing various combinations and relating them with data from profiling could give a hint at more general usage patterns that could be eventually formalized in a more involved implementation of psyco.jit(). Thanks, Armin |
From: Andreas J. <an...@zo...> - 2002-03-01 17:11:02
|
...running the Zope testsuite with psyco fails with a segmentation fault. Andreas ----- Original Message ----- From: "Armin Rigo" <ar...@ul...> To: <psy...@li...> Cc: <zop...@zo...>; <pyt...@py...> Sent: Friday, March 01, 2002 11:21 Subject: [Zope-Coders] Psyco release 0.4.0 > Hello everybody, > > The first beta version of Psyco is released, with Windows and Linux > binaries, for Python 2.1 and 2.2. Any feedback welcome! > > http://sourceforge.net/projects/psyco/ > > > Thanks, > > Armin. > > > _______________________________________________ > Zope-Coders mailing list > Zop...@zo... > http://lists.zope.org/mailman/listinfo/zope-coders > |