[Cython] CEP: prange for parallel loops

Dag Sverre Seljebotn d.s.seljebotn at astro.uio.no
Mon Apr 4 15:51:23 CEST 2011

On 04/04/2011 03:27 PM, Nathaniel Smith wrote:
> On Mon, Apr 4, 2011 at 3:17 AM, Dag Sverre Seljebotn
> <d.s.seljebotn at astro.uio.no>  wrote:
>>   * A simple and friendly solution that covers, perhaps, 80% of the cases,
>> based on simply replacing range with prange.
> This is a "merely" aesthetic objection, while remaining agnostic on
> the larger discussion, but -- 'for i in prange(...)' looks Just Wrong.
> This is not a regular loop over a funny range, it's a funny loop over
> a regular range. Surely it should be 'pfor i in range(...)'. Or better
> yet, spell it 'parallel_for'.

I don't mind calling it "parallel_for" myself, if only a good place to 
provide scheduling parameters (numthreads, dynamic vs. static 
scheduling, chunksize) can be found. That would make it more obvious 
that scoping rules are different too.

No sense in discussing this further until the higher-level discussion on 
whether to do it or not has completed though.

Dag Sverre

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