[melbourne-pug] python slow, pypy fast

[James Alford]

Right, thanks.

That breaks it down for me.  This question is really about a new
project that will do a lot of data crunching that I was going to code
in c which the python code will call out to.  I was looking at pypy
and thought that might be a an alternative to the c code (it still may
be).

On Mon, May 30, 2011 at 3:17 PM, Richard Jones <r1chardj0n3s at gmail.com> wrote:
> On 30 May 2011 15:02, James Alford <mydnite1 at gmail.com> wrote:
>> On Mon, May 30, 2011 at 2:51 PM, Richard Jones <r1chardj0n3s at gmail.com> wrote:
>>> On 30 May 2011 14:48, James Alford <mydnite1 at gmail.com> wrote:
>>>> Pypy seems quite fast.  What I want to know is should you be aiming to
>>>> develop python with pypy or should you really concentrate on python 3?
>>>
>>> Yes, pypy is really very fast for almost all benchmarks they throw at
>>> it. Your question cannot be answered without knowing what you're
>>> developing. Off the top of my head:
>>>
>>> - Does your application need serious performance using regular Python code?
>>> - Can your performance critical bits be coded in C or cython?
>>> - Do you need to use existing libraries?
>>>
>>> All of these questions will help you decide between python2, python3 and pypy.
>>
>> Sorry, I meant it as a general question.
>
> But what I'm saying is there's no general answer.
>
> Even though I'd love to I can't use Python 3 in my day job because of
> the legacy codebase that needs to be migrated.
>
> I can't use pypy for the website because it doesn't run Zope yet. We
> don't need it there though because there's already C code making the
> slow bits fast.
>
> Nor can I use pypy for currently-slow analysis programs that need to
> connect to Oracle, because the cx_Oracle module isn't available for
> pypy yet. If I really cared about speeding those up I could probably
> write some quick cython to do so.
>
> We have one guy in our company using pypy because he does analysis of
> data from other sources that he can happily slurp into a pypy program
> and crunch in ten different ways.
>
>
>     Richard
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