[erlang-questions] Process pool map/3 implementation

[Robert Virding]

One quick question: what was wrong with the straightforward solution of just spawning one process for each element in the list? Did this break or do you actually need more control?

Robert

----- "Parnell Springmeyer" <ixmatus@REDACTED> wrote:

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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 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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