[Cbc] multithreaded cbc for windows

[Petru Pau]

Rolf Steenge was kind enough to answer this question (thank you, Rolf!):

> The website
>
> http://sources.redhat.com/pthreads-win32/
> has the necessary ingredients:
> 1.  Add the header files: pthread.h, sched.h, semaphore.h to the 
> libCbc headers (or your own project)
>
> 2.  Add the library pThreadVSE2.lib to the subproject libCbc (or your 
> own project)
>
> 3.  Last but not least add at the top of the source of CbcModel.h: 
> #define CBC_THREAD 1
> 4.    The dll
>
> pThreadVSE2.dll
>
> should be placed in the same folder as cbc.exe

[
  In fact, five years ago he gave this answer as solution to a ticket:

https://projects.coin-or.org/Cbc/ticket/45
]

I was able to follow the procedure and compile a multithreading-enabled 
CBC.
It works strangely different. The first test was encouraging
(on a 8-core 64bit machine with Windows 7).

(With the same input MIP, the parallel version of Symphony crashed
spectacularly.)

Petru


On 10/5/2012 2:14 PM, acw at ascent.com wrote:
> We are in a similar situation to Petru's.  In our case, we are 
> building our own executable against the binaries provided by the 
> CoinBinary project (whose mailing list I am CCing, since it isn't 
> clear whose bailiwick this is).
>
> When building Cbc from source, the command "./configure" should be 
> replaced with "./configure -C --enable-cbc-parallel" in order to 
> enable multithreading.  We can make this work on Linux but have been 
> stymied on Windows (building under MinGW).
>
> Multithreading with Cbc on Windows is a high priority for us.

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