R devel - Mar 2013 - multi threaded execution of package

Hello,

I'm creating a package for R. This package containes a fortran (wrapped C)
*.so .
This dynamic library is compiled to be multi-threaded (-parallel -openmp
-threads .. options).

When I call this library from R : dyn.load("mylib.so")
the execution is one threaded !

Where could be a problem and how to correct it ?

Thank you !

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On Mar 4, 2013, at 5:57 AM, Vitaliy FEOKTISTOV wrote:
> Hello,
> 
> I'm creating a package for R. This package containes a fortran (wrapped
C)
> *.so .
> This dynamic library is compiled to be multi-threaded (-parallel -openmp
> -threads .. options).
> 
Just the fact that it's compiled with such options doesn't mean it will
actually run threaded, they just turn on support in case the code wants to use
it, they don't actually parallelize anything on their own.

> When I call this library from R : dyn.load("mylib.so")
> the execution is one threaded !
> 
> Where could be a problem and how to correct it ?
> 
Hard to say for sure, but possibly in your code. Would you care to provide the
details, such as your platform, the exact code you're using etc?
Note that there are many packages that have no issue with using OpenMP, for
example.

Cheers,
Simon