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Merge pull request #15 from L2Program/master
OMP Functor improvements and benchmark example
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| /* | ||
| The MIT License(MIT) | ||
| Copyright(c) 2016 Joss Whittle | ||
| Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| of this software and associated documentation files(the "Software"), to deal | ||
| in the Software without restriction, including without limitation the rights | ||
| to use, copy, modify, merge, publish, distribute, sublicense, and / or sell | ||
| copies of the Software, and to permit persons to whom the Software is | ||
| furnished to do so, subject to the following conditions : | ||
| The above copyright notice and this permission notice shall be included in all | ||
| copies or substantial portions of the Software. | ||
| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE | ||
| AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
| OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | ||
| SOFTWARE. | ||
| */ | ||
| #define MEL_IMPLEMENTATION | ||
| #include "MEL_omp.hpp" | ||
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| #include <iomanip> | ||
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| //-----------------------------------------------------------------// | ||
| // Example Usage: mpirun --pernode --hostfile [path] ./ompExample // | ||
| //-----------------------------------------------------------------// | ||
| int main(int argc, char *argv []) { | ||
| MEL::Init(argc, argv); | ||
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| // Who are we? | ||
| MEL::Comm comm = MEL::Comm::WORLD; | ||
| const int rank = MEL::CommRank(comm), | ||
| size = MEL::CommSize(comm); | ||
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| double start, end; | ||
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| // Allocate buffers | ||
| const int LEN = 1e8; | ||
| int *src = MEL::MemAlloc<int>(LEN, 1), // Initilize to 1 | ||
| *dst = (rank == 0) ? MEL::MemAlloc<int>(LEN) : nullptr; | ||
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| // Perform the Reduction on 1 thread with MPI_SUM | ||
| start = MEL::Wtime(); | ||
| MEL::Reduce(src, dst, LEN, MEL::Op::SUM, 0, comm); // Equivalent to standard MPI_Reduce call | ||
| end = MEL::Wtime(); | ||
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| if (rank == 0) | ||
| std::cout << "Reduced " << LEN << " elements in " << std::setw(10) << (end - start) | ||
| << " seconds on 1 thread with MEL::Op::SUM == MPI_SUM." << std::endl; | ||
|
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| // Create a MEL User Defined Operation using a functor wrapped in a map function | ||
| auto SUM = MEL::OpCreate<int, MEL::Functor::SUM>(); | ||
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| // Perform the Reduction on 1 thread | ||
| start = MEL::Wtime(); | ||
| MEL::Reduce(src, dst, LEN, SUM, 0, comm); | ||
| end = MEL::Wtime(); | ||
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| if (rank == 0) | ||
| std::cout << "Reduced " << LEN << " elements in " << std::setw(10) << (end - start) | ||
| << " seconds on 1 thread with mapped MEL::FUNCTOR::SUM." << std::endl; | ||
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| // Create a MEL User Defined Operation using a functor wrapped in a parallel map function | ||
| auto ompSUM = MEL::OMP::OpCreate<int, MEL::Functor::SUM>(); | ||
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| omp_set_num_threads(2); | ||
| omp_set_schedule(omp_sched_static, 0); | ||
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| // Perform the Reduction on 4 threads | ||
| start = MEL::Wtime(); | ||
| MEL::Reduce(src, dst, LEN, ompSUM, 0, comm); | ||
| end = MEL::Wtime(); | ||
|
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| if (rank == 0) | ||
| std::cout << "Reduced " << LEN << " elements in " << std::setw(10) << (end - start) | ||
| << " seconds on 2 threads with parallel mapped MEL::FUNCTOR::SUM." << std::endl; | ||
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| omp_set_num_threads(4); | ||
| omp_set_schedule(omp_sched_static, 0); | ||
|
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| // Perform the Reduction on 8 threads | ||
| start = MEL::Wtime(); | ||
| MEL::Reduce(src, dst, LEN, ompSUM, 0, comm); | ||
| end = MEL::Wtime(); | ||
|
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||
| if (rank == 0) | ||
| std::cout << "Reduced " << LEN << " elements in " << std::setw(10) << (end - start) | ||
| << " seconds on 4 threads with parallel mapped MEL::FUNCTOR::SUM." << std::endl; | ||
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| omp_set_num_threads(8); | ||
| omp_set_schedule(omp_sched_static, 0); | ||
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| // Perform the Reduction on 8 threads | ||
| start = MEL::Wtime(); | ||
| MEL::Reduce(src, dst, LEN, ompSUM, 0, comm); | ||
| end = MEL::Wtime(); | ||
|
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| if (rank == 0) | ||
| std::cout << "Reduced " << LEN << " elements in " << std::setw(10) << (end - start) | ||
| << " seconds on 8 threads with parallel mapped MEL::FUNCTOR::SUM." << std::endl; | ||
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| omp_set_num_threads(16); | ||
| omp_set_schedule(omp_sched_static, 0); | ||
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| // Perform the Reduction on 16 threads | ||
| start = MEL::Wtime(); | ||
| MEL::Reduce(src, dst, LEN, ompSUM, 0, comm); | ||
| end = MEL::Wtime(); | ||
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| if (rank == 0) | ||
| std::cout << "Reduced " << LEN << " elements in " << std::setw(10) << (end - start) | ||
| << " seconds on 16 threads with parallel mapped MEL::FUNCTOR::SUM." << std::endl; | ||
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| // Clean up the operations when we are done with them | ||
| MEL::OpFree(SUM, ompSUM); | ||
| // Clean up buffers | ||
| MEL::MemFree(src, dst); | ||
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| MEL::Finalize(); | ||
| return 0; | ||
| } |