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add a small benchmark to quickly bench/compare SMP support

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Gael Guennebaud
2010-02-22 11:09:57 +01:00
parent 1c6bdb4060
commit aaaf855a88
2 changed files with 111 additions and 0 deletions
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43
bench/bench_gemm.cpp Normal file
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// g++-4.4 bench_gemm.cpp -I .. -O2 -DNDEBUG -lrt -fopenmp && OMP_NUM_THREADS=2 ./a.out
// icpc bench_gemm.cpp -I .. -O3 -DNDEBUG -lrt -openmp && OMP_NUM_THREADS=2 ./a.out
#include <Eigen/Core>
#include "../../eigen2/bench/BenchTimer.h"
using namespace std;
using namespace Eigen;
#ifndef SCALAR
#define SCALAR float
#endif
typedef SCALAR Scalar;
typedef Matrix<Scalar,Dynamic,Dynamic> M;
void gemm(const M& a, const M& b, M& c)
{
c.noalias() += a * b;
}
int main(int argc, char ** argv)
{
int rep = 2;
int s = 1024;
int m = s;
int n = s;
int p = s;
M a(m,n); a.setOnes();
M b(n,p); b.setOnes();
M c(m,p); c.setOnes();
BenchTimer t;
BENCH(t, 5, rep, gemm(a,b,c));
std::cerr << "cpu " << t.best(CPU_TIMER)/rep << "s \t" << (double(m)*n*p*rep*2/t.best(CPU_TIMER))*1e-9 << " GFLOPS \t(" << t.total(CPU_TIMER) << "s)\n";
std::cerr << "real " << t.best(REAL_TIMER)/rep << "s \t" << (double(m)*n*p*rep*2/t.best(REAL_TIMER))*1e-9 << " GFLOPS \t(" << t.total(REAL_TIMER) << "s)\n";
return 0;
}