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Re: [Help-glpk] Parallel runs of glpk

From: Andrew Makhorin
Subject: Re: [Help-glpk] Parallel runs of glpk
Date: Wed, 14 Dec 2016 19:27:11 +0300

On Wed, 2016-12-14 at 15:06 +0100, Mathieu Dutour wrote:
> I am interested in running glpk from a multithreaded program.
> The goal is not to have GLPK itself parallel but instead to
> have glpk used many times by different threads for solving
> many different linear programs.
> As is well known glpk is not thread safe and my question
> is about alternative solution to that problem. Here are some
> possibilities:
> A) One is to have to run glpsol standalone by running it
> as external program with the input file generated by the thread
> and then read by the thread. But this solution has its costs
> in terms of runtime. It is easy to program.
> B) Have one thread that does only call glpk. It is adequate
> in single threaded performance but potentially expensive 
> since some thread may wait. Relatively easy to program.
> C) Use shared memory to exchange data. That is multiple
> number of individual programs running glpk and getting their
> data from shared memory.
> Any other solution? Is there any implementation that you
> would recommend?

Please see .

If you are interested in this solution, I can post you a reentrant
version of glpk/src/env/tls.c for GNU/Linux or MS Windows (from an old
glpk distribution).

Andrew Makhorin

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