Parallelising code

Michael Palmer m_palmer45 at yahoo.ca
Tue Sep 16 01:37:29 CEST 2008


On Sep 15, 12:46 pm, "psaff... at googlemail.com"
<psaff... at googlemail.com> wrote:
> I have some file processing code that has to deal with quite a lot of
> data. I have a quad core machine, so I wondered whether I could take
> advantage of some parallelism.
>
> Essentially, I have a number of CSV files, let's say 100, each
> containing about 8000 data points. For each point, I need to look up
> some other data structures (generated in advance) and append the point
> to a relevant list. I wondered whether I could get each core to handle
> a few files each. I have a few questions:
>
> - Am I actually going to get any speed up from parallelism, or is it
> likely that most of my processing time is spent reading files? I guess
> I can profile for this?
>
> - Is list.append() thread safe? (not sure if this is the right term)
> what I mean is, can two separate processors file a point in the same
> list at the same time without anything horrible happening? Do I need
> to do anything special (mutex or whatever) to make this happen, or
> will it happen automatically?
>
> Thanks in advance for any guidance,
>
> Peter

Look at http://pypi.python.org/pypi/processing



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