Comments on: PyCon 2010: Sunday Plenaries

By: Diane

Diane — Sun, 06 Jun 2010 05:23:00 +0000

They would probably have to put an attendance cap of 1500 so that we wouldn’t run out of room at the current venue.And the Java implementation of Python. It turns out that version 2.5.1 has really good compatibility with the normal Python implementation such that Jython passes almost all of CPython’s test suite.Thanks for the informative article ! G-d bless

By: Raphaël Valyi

Raphaël Valyi — Sat, 27 Feb 2010 18:04:09 +0000

@Roberto,

you are right about the JVM method size limitation. But that’s really a corner case bug. In general, good programming should make methods smaller than that limit…

As for the Reportlab case, I had my patch fixing this applied in the trunk version some 2 weeks ago (at least they told they did it). So I expect the next Reportlab version will finally be Jython compatible.

BTW, I very sad to see more investment into Unladen Swallow than Jython. Considering the effort, I find the the Unladen Swallow perf boost is not that huge (very far from the 5x that targeted in fanfare). On the contrary when you see how much faster JRuby is over the CRuby (using flags to run the same Ruby version) implementations, you think that with a bit more investment, Jython could take the lead and really help running Python faster…

By: Raphaël Valyi

Raphaël Valyi — Sat, 27 Feb 2010 18:04:00 +0000

@Roberto,

you are right about the JVM method size limitation. But that’s really a corner case bug. In general, good programming should make methods smaller than that limit…

By: Mike

Mike — Wed, 24 Feb 2010 00:53:08 +0000

@ Roberto,

Thanks for clarifying that. I just took the comments made by the speaker at face value.

- Mike

By: Mike

Mike — Wed, 24 Feb 2010 00:53:00 +0000

@ Roberto,

Thanks for clarifying that. I just took the comments made by the speaker at face value.

- Mike

By: Mike

Mike — Wed, 24 Feb 2010 00:52:11 +0000

Hi Collin,

Thanks for the update. That’s good to know. Thanks also for taking the time to comment!

- Mike

By: Mike

Mike — Wed, 24 Feb 2010 00:52:00 +0000

Hi Collin,

Thanks for the update. That’s good to know. Thanks also for taking the time to comment!

- Mike

By: Collin Winter

Collin Winter — Tue, 23 Feb 2010 15:40:25 +0000

Hey Mike, just wanted to note that the example I gave in the Sunday talk was of one particular optimization that yielded 20% performance in Django. We now run the Django benchmark 60% than CPython.

The code changes, if you’re curious, are here: http://codereview.appspot.com/217052/show

Thanks,
Collin Winter

By: Collin Winter

Collin Winter — Tue, 23 Feb 2010 15:40:00 +0000

Hey Mike, just wanted to note that the example I gave in the Sunday talk was of one particular optimization that yielded 20% performance in Django. We now run the Django benchmark 60% than CPython.

The code changes, if you’re curious, are here: http://codereview.appspot.com/217052/show

Thanks,
Collin Winter

By: Roberto Alsina

Roberto Alsina — Tue, 23 Feb 2010 11:26:17 +0000

There is legal pure python code that doesn’t work on Jython and probably never will without changing it because the JVM has some limitations.

The example I remember is reportlab, which hit a limit in root module object sizes I think (like, if a module has a data structure defined that’s not part of a class and is over 64KB it braks Jython)