cpp_thread_safety_common.h

inlinevoidpauser(){
/// a portable way to pause a program
 std::string dummy;
 std::cout << "Press enter to continue...";
std::getline(std::cin, dummy);
}

voidFailIfThreadsAreZero(uint32_t numConcurrentThreads) {
if(numConcurrentThreads == 0) {
 std::cout<<"ERROR: Invalid parameter 0 for number of concurrent calls into OpenBLAS!"<<std::endl;
 std::cout<<"CBLAS DGEMV thread safety test FAILED!"<<std::endl;
exit(-1);
 }
}

voidFillMatrices(std::vector<std::vector<double>>& matBlock, std::mt19937_64& PRNG, std::uniform_real_distribution<double>& rngdist, const blasint randomMatSize, constuint32_t numConcurrentThreads, constuint32_t numMat){
for(uint32_t i=0; i<numMat; i++){
for(uint32_t j = 0; j < static_cast<uint32_t>(randomMatSize*randomMatSize); j++){
 matBlock[i][j] = rngdist(PRNG);
 }
 }
for(uint32_t i=numMat; i<(numConcurrentThreads*numMat); i+=numMat){
for(uint32_t j=0; j<numMat; j++){
 matBlock[i+j] = matBlock[j];
 }
 }
}

voidFillVectors(std::vector<std::vector<double>>& vecBlock, std::mt19937_64& PRNG, std::uniform_real_distribution<double>& rngdist, const blasint randomMatSize, constuint32_t numConcurrentThreads, constuint32_t numVec){
for(uint32_t i=0; i<numVec; i++){
for(uint32_t j = 0; j < static_cast<uint32_t>(randomMatSize); j++){
 vecBlock[i][j] = rngdist(PRNG);
 }
 }
for(uint32_t i=numVec; i<(numConcurrentThreads*numVec); i+=numVec){
for(uint32_t j=0; j<numVec; j++){
 vecBlock[i+j] = vecBlock[j];
 }
 }
}

std::mt19937_64 InitPRNG(){
 std::random_device rd;
 std::mt19937_64 PRNG(rd()); //seed PRNG using /dev/urandom or similar OS provided RNG
 std::uniform_real_distribution<double> rngdist{-1.0, 1.0};
//make sure the internal state of the PRNG is properly mixed by generating 10M random numbers
//PRNGs often have unreliable distribution uniformity and other statistical properties before their internal state is sufficiently mixed
for (uint32_t i=0;i<10000000;i++) rngdist(PRNG);
return PRNG;
}

voidPrintMatrices(const std::vector<std::vector<double>>& matBlock, const blasint randomMatSize, constuint32_t numConcurrentThreads, constuint32_t numMat){
for (uint32_t i=0;i<numConcurrentThreads*numMat;i++){
 std::cout<<i<<std::endl;
for (uint32_t j = 0; j < static_cast<uint32_t>(randomMatSize); j++){
for (uint32_t k = 0; k < static_cast<uint32_t>(randomMatSize); k++){
 std::cout<<matBlock[i][j*randomMatSize + k]<<"";
 }
 std::cout<<std::endl;
 }
 std::cout<<std::endl;
 }
}