[erlang-questions] Process pool map/3 implementation
Wed Jul 20 07:08:00 CEST 2011
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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
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 to me at this address.
You may find the code on BitBucket: https://bitbucket.org/ixmatus/ppool
Parnell "ixmatus" Springmeyer (http://ixmat.us)
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