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Task #1912 ยป sharedptr-bench.cpp

Junxiao Shi, 08/22/2014 09:38 PM

 
// g++ sharedptr-bench.cpp -lrt

#include <time.h>
#include <stdio.h>
#include <boost/shared_ptr.hpp>
#include <boost/make_shared.hpp>

using boost::shared_ptr;
using boost::make_shared;

struct A
{
int i;
};

void
f1(const shared_ptr<A>& a)
{
++ a->i;
}

void
f2(shared_ptr<A> a)
{
++ a->i;
}

int
main()
{
shared_ptr<A> a = make_shared<A>();

timespec t1, t2, t3;
clock_gettime(CLOCK_MONOTONIC, &t1);
for (int k = 0; k < 1000000; ++k) {
f1(a);
}
clock_gettime(CLOCK_MONOTONIC, &t2);
for (int k = 0; k < 1000000; ++k) {
f2(a);
}
clock_gettime(CLOCK_MONOTONIC, &t3);

printf("f1 %ld\n", (t2.tv_sec - t1.tv_sec) * 1000000000 + (t2.tv_nsec - t1.tv_nsec));
printf("f2 %ld\n", (t3.tv_sec - t2.tv_sec) * 1000000000 + (t3.tv_nsec - t2.tv_nsec));
}

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