Kokkos Node API and Local Linear Algebra Kernels Version of the Day
Kokkos_OpenMPNode.cpp
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00004 //          Kokkos: Node API and Parallel Node Kernels
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00041 
00042 #include <Teuchos_ParameterList.hpp>
00043 #include "Kokkos_OpenMPNode.hpp"
00044 
00045 namespace Kokkos {
00046 
00047   OpenMPNode::OpenMPNode () :
00048     curNumThreads_ (-1), // Default: Let OpenMP pick the number of threads
00049     verbose_ (false) // Default: No verbose status output
00050   {
00051     init (curNumThreads_);
00052   }
00053 
00054 
00055   OpenMPNode::OpenMPNode (Teuchos::ParameterList &pl) :
00056     curNumThreads_ (-1), // Default: Let OpenMP pick the number of threads
00057     verbose_ (false) // Default: No verbose status output
00058   {
00059     // Don't set state (in this case, curNumThreads_) until we've read
00060     // in all the parameters.
00061     //
00062     // -1 or 0 mean let OpenMP pick the number of threads.  A positive
00063     // value means that we should tell OpenMP how many threads to use.
00064     const int curNumThreads = pl.get<int>("Num Threads", -1);
00065     // FIXME (mfh 10 Jul 2012) This should be a bool, not an int.
00066     // However, I don't want to change the public interface yet.
00067     const int verbose = pl.get<int>("Verbose", 0);
00068     TEUCHOS_TEST_FOR_EXCEPTION(curNumThreads < -1, std::runtime_error,
00069       "OpenMPNode::OpenMPNode(): invalid \"Num Threads\" parameter value "
00070       << curNumThreads << ".");
00071     if (verbose) {
00072       std::cout << "OpenMPNode initializing with \"Num Threads\" = "
00073                 << curNumThreads << std::endl;
00074     }
00075     init (curNumThreads);
00076     curNumThreads_ = curNumThreads; // Now it's safe to set state.
00077     verbose_ = (verbose != 0);
00078   }
00079 
00080   OpenMPNode::~OpenMPNode() {}
00081 
00082   void OpenMPNode::init (int numThreads) {
00083     // mfh 10 Jul 2012: Don't set the number of threads if it's
00084     // negative (the default value of the "Num Threads" parameter is
00085     // -1) or 0.
00086     if (numThreads > 0) {
00087       omp_set_num_threads (numThreads);
00088     }
00089   }
00090 
00091 }
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