2 /// a portable way to pause a program
4 std::cout << "Press enter to continue...";
5 std::getline(std::cin, dummy);
8 void FailIfThreadsAreZero(uint32_t numConcurrentThreads) {
9 if(numConcurrentThreads == 0) {
10 std::cout<<"ERROR: Invalid parameter 0 for number of concurrent calls into OpenBLAS!"<<std::endl;
11 std::cout<<"CBLAS DGEMV thread safety test FAILED!"<<std::endl;
16 void FillMatrices(std::vector<std::vector<double>>& matBlock, std::mt19937_64& PRNG, std::uniform_real_distribution<double>& rngdist, const blasint randomMatSize, const uint32_t numConcurrentThreads, const uint32_t numMat){
17 for(uint32_t i=0; i<numMat; i++){
18 for(uint32_t j = 0; j < static_cast<uint32_t>(randomMatSize*randomMatSize); j++){
19 matBlock[i][j] = rngdist(PRNG);
22 for(uint32_t i=numMat; i<(numConcurrentThreads*numMat); i+=numMat){
23 for(uint32_t j=0; j<numMat; j++){
24 matBlock[i+j] = matBlock[j];
29 void FillVectors(std::vector<std::vector<double>>& vecBlock, std::mt19937_64& PRNG, std::uniform_real_distribution<double>& rngdist, const blasint randomMatSize, const uint32_t numConcurrentThreads, const uint32_t numVec){
30 for(uint32_t i=0; i<numVec; i++){
31 for(uint32_t j = 0; j < static_cast<uint32_t>(randomMatSize); j++){
32 vecBlock[i][j] = rngdist(PRNG);
35 for(uint32_t i=numVec; i<(numConcurrentThreads*numVec); i+=numVec){
36 for(uint32_t j=0; j<numVec; j++){
37 vecBlock[i+j] = vecBlock[j];
42 std::mt19937_64 InitPRNG(){
43 std::random_device rd;
44 std::mt19937_64 PRNG(rd()); //seed PRNG using /dev/urandom or similar OS provided RNG
45 std::uniform_real_distribution<double> rngdist{-1.0, 1.0};
46 //make sure the internal state of the PRNG is properly mixed by generating 10M random numbers
47 //PRNGs often have unreliable distribution uniformity and other statistical properties before their internal state is sufficiently mixed
48 for (uint32_t i=0;i<10000000;i++) rngdist(PRNG);
52 void PrintMatrices(const std::vector<std::vector<double>>& matBlock, const blasint randomMatSize, const uint32_t numConcurrentThreads, const uint32_t numMat){
53 for (uint32_t i=0;i<numConcurrentThreads*numMat;i++){
54 std::cout<<i<<std::endl;
55 for (uint32_t j = 0; j < static_cast<uint32_t>(randomMatSize); j++){
56 for (uint32_t k = 0; k < static_cast<uint32_t>(randomMatSize); k++){
57 std::cout<<matBlock[i][j*randomMatSize + k]<<" ";