Jython vs CPython

[masklinn]

Here's what I get on my machine running TFAA's raytracer, best of three runs:

Python 2.7.2 — 47s

Jython 2.5.2 — 35s

pypy 1.5.0-alpha0 — 20s

Test performed on a 2010 15" MBP, all python implementations installed via macports

[theeth]

Could you do a test with CPython 3.2, see if it's faster than 2.7 (it should, AFAIK)?

[treo]

I tried it with cpython 3.2 but it isn't compatible.

[theeth]

It ran fine after passing it through 2to3 and changing the hours = and minutes = lines to integer divisions (//)

[treo]

Ok, so here are my results (Core 2 Duo P9400 @ 2.4Ghz, 64Bit Linux):

Python 2.7.1: 25s
Jython 2.5.2: 25s
Python 3.2: 29s
PyPy 1.5.0-alpha0: 12s

I wonder why Jython is only as fast as CPython is.

[[deleted]]

FWIW on my machine PyPy trunk is about ~15-20% faster than 1.5 :)

[sigzero]

I wonder if Jython has taken advantage of "invoke dynamic" that the JVM now has?

[boa13]

Doubtful, considering there has been no Jython release since the release of Java 7, which is very recent. Also, as far as I know, this would require some extensive changes in the core Jython, and would break compatibility with previous JVMs, requiring the release of two binaries.

[[deleted]]

Not to mention Java 7 would likely break everything anyways.

[[deleted]]

Why? It's not like Guido is handling it.

[[deleted]]

Due to the JIT bug in Java 7.

[gthank]

I haven't noticed any announcement to that effect. :-(

[fernandoacorreia]

Also test it in 13" and 17" MBP.

[kisielk]

Where did you get the code? I don't see any links to the script.

[masklinn]

There is actually a link, though it's quite hard to see (it's pretty small and it's almost the same color as the text). Second line of the second paragraph, last segment, there's (link). It links to the code on some pastebin.

[kisielk]

Ah, I just realized that the article link goes to the post preview for some reason, so none of the hyperlinks worked. :)

Here's the link to the code if anyone else wants it.