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barrier.cpp
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57 lines (52 loc) · 1.06 KB
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#include "../../utils/TimeStamp.hh"
#include "overhead.hh"
#include <omp.h>
extern void dummy();
double barrier(int nthreads, int count){
double cycles;
#pragma omp parallel \
num_threads(nthreads) \
default(none) \
shared(count, cycles)
{
TimeStamp clk;
/* barrier to protect clk. */
#pragma omp barrier
#pragma omp master
clk.tic();
for(int i=0; i < count; i++){
dummy();
/* barrier inside for loop, this one is timed. */
#pragma omp barrier
}
#pragma omp master
cycles = clk.toc();
}
return cycles;
}
double nobarrier(int nthreads, int count){
double cycles;
#pragma omp parallel \
num_threads(nthreads) \
default(none) \
shared(count, cycles)
{
TimeStamp clk;
/* barrier to protect clk. */
#pragma omp barrier
#pragma omp master
clk.tic();
for(int i=0; i < count; i++){
dummy();
}
#pragma omp master
cycles = clk.toc();
}
return cycles;
}
//overhead.hh.
double barrier_overhead(int nthreads, long int count){
double b = barrier(nthreads, count);
double nb = nobarrier(nthreads, count);
return (b-nb)/count;
}