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tim |
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#include <cassert> |
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#include <fstream> |
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#include <algorithm> |
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#include "utils/simError.h" |
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#include "math/ParallelRandNumGen.hpp" |
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void RandNumGenTestCase::testUniform(){ |
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MTRand randNumGen(823645754); |
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const int N = 16; |
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std::vector<unsigned long int> histogram(N, 0); |
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const int num = 1000000; |
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for (int i = 0; i <num; ++i) { |
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++histogram[randNumGen.randInt(N -1 )]; // rantInt returns an integer in [0, N-1] |
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} |
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std::ofstream uniform("uniform.dat") |
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int avg = num / N; |
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double tolerance = 0.01*avg; |
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for (int i = 0; i < num; ++i) { |
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assert((histogram[i] - avg) /avg <= tolerance); |
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uniform << i << "\t" << histogram[i] << std::endl; |
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} |
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} |
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void RandNumGenTestCase::testGaussian(){ |
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MTRand randNumGen(823645754); |
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double mean = 100.0; |
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double variance = 1.0; |
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const int num = 1000000; |
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double interval = 0.1; |
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const int size = 2000; |
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vector<unsigned long int> histogram(size , 0); |
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vector<double> normalizedHistogram(size); |
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for (int i = 0; i < num; ++i) { |
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int index = static_cast<int>(randNumGen.randNorm(mean, variance) / interval); |
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++histogram[index]; |
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} |
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std::transform(histogram.begin(), histogram.end(), normalizedHistogram.begin(), std::bind2nd(std::divides<double>(), num)); |
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std::ofstream gaussian("gaussian.dat"); |
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for (int i = 0; i < num; ++i) { |
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gaussian << i << "\t" << normalizedHistogram[i] << std::endl; |
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} |
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} |
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void RandNumGenTestCase::testParallelRandNumGen(){ |
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const int seed = 324271632; |
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const int nloops = 1000000; |
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MPI_Status istatus; |
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ParallelRandNumGen mpiRandNumGen(seed); |
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const int masterNode = 0; |
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if (worldRank = masterNode) { |
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MTRand singleRandNumGen(seed); |
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int nProcessors; |
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MPI_Comm_size(MPI_COMM_WORLD, &nProcessors); |
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std::vector<unsigned long int> mpiRandNums(nProcessors); |
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std::vector<unsigned long int> singleRandNums(nProcessors); |
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for (int i = 0; i < nloops; ++i) { |
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mpiRandNums[masterNode] = mpiRandNumGen.randInt(); |
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for (int j = 0; j < nProcessors; ++j) { |
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if (j != masterNode) { |
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MPI_Recv(&mpiRandNums[j], 1, MPI_UNSIGNED_LONG, j, i, MPI_COMM_WORLD, &istatus); |
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} |
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singleRandNums[j] = mpiRandNumGen.randInt(); |
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} |
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assert(mpiRandNums, singleRandNums); |
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} |
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} else { |
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unsigned long int randNum; |
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for (int i = 0; i < nloops; ++i) { |
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randNum = mpiRandNumGen.randInt(); |
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MPI_Send(&randNum, 1, MPI_INT, masterNode, i, MPI_COMM_WORLD); |
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} |
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} |
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} |
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int main(int argc, char* argv[]) { |
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MPI_Init(argc, argv); |
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if (worldRank == 0 ) { |
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testUniform(); |
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testGaussian(); |
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} |
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testParallelRandNumGen(); |
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MPI_Finalize(); |
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} |
