/* COPYRIGHT (2011-2012) by: Kevin Marco Erler (author), http://www.kevinerler.de AIU-FSU Jena (co-owner), http://www.astro.uni-jena.de SBSZ Jena-Göschwitz (co-owner), http://www.sbsz-jena.de BSZ-Hermsdorf (co-owner), http://www.bszh.de Advanced Licensing (dual license: COPYRIGHT and following licenses): License (international): CC-BY v3.0-unported or later - link: http://creativecommons.org/licenses/by/3.0/deed.en License (Germany): CC-BY v3.0-DE or later - link: http://creativecommons.org/licenses/by/3.0/de/ ------------------ Compilation requirements: Packages (x86-64): GCC >v4.2, compat. libstdc++ and GOMP v3.0 Normal-Compile with g++-Compiler (Red Hat GCC 4.4.5-6 x86-64 tested) + OpenMP v3.0 ([lib]GOMP v3.0 x86-64 tested) g++ -std=c++0x -m64 -fopenmp -Wall -Wextra -pedantic -pedantic-errors -lgomp -lm -s <source.cpp> -o <dest> Release-Compile with g++-Compiler (Red Hat GCC 4.4.5-6 x86-64 tested) + OpenMP v3.0 ([lib]GOMP v3.0 x86-64 tested) g++ -std=c++0x -m64 -fopenmp -Wall -Wextra -pedantic -pedantic-errors -lgomp -lm -O3 -s <source.cpp> -o <dest> Debug-Compile with g++-Compiler (Red Hat GCC 4.4.5-6 x86-64 tested) + OpenMP v3.0 ([lib]GOMP v3.0 x86-64 tested) g++ -std=c++0x -m64 -fopenmp -Wall -Wextra -pedantic -pedantic-errors -lgomp -lm -g -ggdb3 <source.cpp> -o <dest> */ // Includes of C/C++-Librarys for INTs, REAL/FLOATs, STRINGS, Math-Calc and I/O #include <climits> #include <cstdint> #include <cinttypes> #include <cfloat> #include <cwchar> #include <string> //std:string #include <string.h> #include <cstring> #include <cstdlib> #include <cstdio> #include <iostream> #include <sstream> #include <cmath> // Conditional compilation (conditional include) of the OpenMP-Mainlib for OpenMP-Support #ifdef _OPENMP #include <omp.h> #endif using namespace std; #define free(x) free(x); *x=NULL #define PRId128 "s" #define PRIi128 "s" #define PRIu128 "s" const uint64_t UINT64_MIN = 0; const __int128_t INT128_MIN = (__int128_t)((-170141183460469231731.687303715884105728) * pow(10,18)); const __int128_t INT128_MAX = (__int128_t)(( 170141183460469231731.687303715884105727) * pow(10,18)); const __uint128_t UINT128_MAX = (__uint128_t)((340282366920938463463.374607431768211455) * pow(10,18)); const __uint128_t UINT128_MIN = 0/* * pow(10,18)*/; std::ostream &operator<<(std::ostream &out, __uint128_t x) { if(x >= 10) { out << x / 10; } return out << static_cast<unsigned>(x % 10); } std::ostream &operator<<(std::ostream &out, __int128_t x) { if(x < 0) { out << '-'; x = -x; } return out << static_cast<__uint128_t>(x); } string INT128ToSTR(__int128_t x) { std::stringstream sstr; sstr<<x; return sstr.str(); } #define INT128ToCSTR(x) (INT128ToSTR(x)).c_str() string UINT128ToSTR(__uint128_t x) { std::stringstream sstr; sstr<<x; return sstr.str(); } #define UINT128ToCSTR(x) (UINT128ToSTR(x)).c_str() const uint64_t NumValues = 1000000000ULL; int main(int argc, char *argv[]) { // Runtime manipulation of OpenMP-state variables //omp_set_num_threads(4); omp_set_dynamic(0); // data declarations and implementations double starttime = 0.00, gaussdelay = 0.00, sdelay = 0.00, pdelay = 0.00; uint64_t SumGauss = 0ULL, SumSingle = 0ULL, SumParallel = 0ULL; std::cout << "Akkumulation - Gaußsche Summenformel (kleiner Gauß) (64-Bit)\n" << "===================================================================\n" << "AUSFÜHRUNG gaußsche Summenformel:"; //--------------------------Begin: directly execution of algorithm--------------------------------- starttime = omp_get_wtime(); //direkte Anwendung der Gaußschen Summenformel (kleiner Gauß) / directly algorithm: SumGauss = (NumValues*(NumValues+1ULL))/2ULL; gaussdelay = omp_get_wtime()-starttime; std::cout << " done\n"; //Gaußsche Summenformel (kleiner Gauß) //--------------------------End: directly execution of algorithm----------------------------------- //--------------------------Begin: CPU-serial execution of algorithm------------------------------- std::cout << "SERIELLE AUSFÜHRUNG:"; starttime = omp_get_wtime(); //CPU-serial algorithm (iterative): for(uint64_t i=0ULL;i<(NumValues+1ULL);++i) { SumSingle+=i; } sdelay = omp_get_wtime()-starttime; std::cout << " done\n"; //serial (iterative) //--------------------------End: CPU-serial execution of algorithm--------------------------------- //--------------------------Begin: CPU-parallel OpenMP-execution of algorithm---------------------- std::cout << "PARALLELE AUSFÜHRUNG mit "; //uint64_t *Threads = new uint64_t[omp_get_max_threads()]; // create parallel region: shared(Threads,...) if using "Threads"-variable #pragma omp parallel default(none) shared(std::cout, starttime, pdelay, SumParallel) { #pragma omp master { std::cout << omp_get_num_threads() << " Threads:"; starttime = omp_get_wtime(); } //OpenMP-CPU-parallel algorithm with the Reduction-clause: #pragma omp flush #pragma omp for schedule(static) reduction(+: SumParallel) for(uint64_t k=0ULL;k<(NumValues+1ULL);++k) { SumParallel+=k; //Threads[omp_get_thread_num()]+=k; } #pragma omp master { pdelay = omp_get_wtime()-starttime; if(omp_get_num_threads() >= 10) { std::cout << " done\n"; //parallel (iterative) } else { std::cout << " done\n"; //parallel (iterative) } /* //Partial results of each CPU-Thread for(int j=0;j<omp_get_num_threads();++j) { if(j<9) { std::cout << "Summe von Thread " << (j+1) << ": " << Threads[j] << '\n'; } else { std::cout << "Summe von Thread " << (j+1) << ": " << Threads[j] << '\n'; } }*/ } } //--------------------------End: CPU-parallel OpenMP-execution of algorithm------------------------ //--------------------------Analysis of results---------------------------------------------------- std::cout << "\nAuswertung:\n" << "*******************************************************************\n" << "Anzahl aufeinanderfolgender natürliche Zahlen: " << NumValues << '\n' << "Summe - SERIELL: " << SumSingle << "\n" << "Summe - PARALLEL: " << SumParallel << "\n" << "Referenzwert (Gaußsche Summenformel): " << SumGauss << '\n' << "Dauer - Gaußsche Summenformel: " << gaussdelay << " sec\n" << "Dauer - SERIELL: " << sdelay << " sec\n" << "Dauer - PARALLEL: " << pdelay << " sec\n" << "__________________" << "\n64-Bit-Werte:\n" << "INT64_MIN: " << INT64_MIN << '\n' << "INT64_MAX: " << INT64_MAX << '\n' << "UINT64_MIN: " << UINT64_MIN << '\n' << "UINT64_MAX: " << UINT64_MAX << '\n'; //delete []Threads; getchar(); return 0; }