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| pspringmeyer |
 Posted: Wed Jul 20, 2011 5:06 am |
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Joined: 20 Jul 2011
Posts: 2
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For a work project I have a large list (thousands of items) to process
and at first built a "pmap" implementation as per Joe's book until I
found the plists module (which is awesome btw).
There is one glaring issue with the list -> subdivide -> spawn x
processes for n sublist items strategy; if an item in the sublist takes
longer than all the other items it blocks the entire resource allotment
until it is done.
In most cases, the plists/pmap implementation works just fine because
the items in the list probably don't take more than a few milliseconds
to map the fun over. However, it does become an issue when that is not
the case.
So, I figured the next best strategy would be to implement a process
pool since it would allow for slow running processes to continue their
work while finished processes can die and new processes spawned into the
pool ready for work - so none of the resources are sitting idle.
Right now, my module isn't nearly as feature-complete as the plists
module is - this is only a drop in replacement for map. Please submit
your criticisms and comments.
You may find the code on BitBucket here: https://bitbucket.org/ixmatus/ppool |
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| zhangc123 |
| Posted: Fri Jun 22, 2012 2:56 am |
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Joined: 22 Jun 2012
Posts: 6
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| wuji |
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| RichardFudnavis |
| Posted: Mon Sep 17, 2012 10:55 am |
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Joined: 08 Sep 2012
Posts: 4
Location: 234 Arthurs Pl, Stanardsville, VA 22973
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| Interestingly just using numpy arrays to compute series*series is the super fastest. It looks like some serious optimization has gone into the more basic array operations. Multiply(series,series) was way faster than the original pool or map functions. |
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