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Re: [Getfem-users] Compiling getfem with openmp

From: Andriy Andreykiv
Subject: Re: [Getfem-users] Compiling getfem with openmp
Date: Wed, 23 Jan 2019 11:00:12 +0100

Dear  Prajjwal,

Could you try the latest master branch? This issue with copying is solved there.

Regarding your motivation, to run several fem simulations simultaneously. It works a bit different. Open mp parallelization of getfem
primarily relates to parallel assembly for stiffness matrices and RHSs for a single simulation (not even the solver). 
If you really want to launch multiple independent simulations in parallel you don't need OpenMP.
You can launch them one by one through a command line or a script.

Best regards,

On Wed, 23 Jan 2019 at 05:57, Prajjwal Jamdagni <address@hidden> wrote:
Dear Getfem users,

I am trying to compile getfem 5.3 with --enable-openmp flag. During the build process i get the following error: In instantiation of ‘void bgeot::igeometric_trans<FUNC>::compute_grad_() const [with FUNC = bgeot::polynomial<double>]’:   required from ‘void bgeot::igeometric_trans<FUNC>::poly_vector_grad(const base_node&, bgeot::base_matrix&) const [with FUNC = bgeot::polynomial<double>; bgeot::base_node = bgeot::small_vector<double>; bgeot::base_matrix = gmm::dense_matrix<double>]’   required from here error: use of deleted function ‘getfem::omp_guard::omp_guard(getfem::omp_guard&&)’
       auto guard = getfem::omp_guard{};
In file included from getfem/dal_singleton.h:48:0,
getfem/getfem_omp.h:72:9: note: ‘getfem::omp_guard::omp_guard(getfem::omp_guard&&)’ is implicitly deleted because the default definition would be ill-formed:
   class omp_guard: public boost::lock_guard<boost::recursive_mutex>
I found a post on similar problem but there was no solution:

I want to run several fem simulations simultaneously, each in its own thread. My another question is do i need to include additional header files or some other openmp specific instructions in getfem or the usual openmp instructions will be sufficient?

Thank you for your help.


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