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turbonss/cxxmph/benchmark.cc

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2011-02-19 00:15:24 +02:00
#include "benchmark.h"
#include <cstring>
#include <cstdio>
#include <sys/resource.h>
#include <iostream>
#include <vector>
using std::cerr;
using std::endl;
using std::string;
using std::vector;
namespace {
/* Subtract the `struct timeval' values X and Y,
storing the result in RESULT.
Return 1 if the difference is negative, otherwise 0. */
int timeval_subtract (
struct timeval *result, struct timeval *x, struct timeval* y) {
/* Perform the carry for the later subtraction by updating y. */
if (x->tv_usec < y->tv_usec) {
int nsec = (y->tv_usec - x->tv_usec) / 1000000 + 1;
y->tv_usec -= 1000000 * nsec;
y->tv_sec += nsec;
}
if (x->tv_usec - y->tv_usec > 1000000) {
int nsec = (x->tv_usec - y->tv_usec) / 1000000;
y->tv_usec += 1000000 * nsec;
y->tv_sec -= nsec;
}
/* Compute the time remaining to wait.
tv_usec is certainly positive. */
result->tv_sec = x->tv_sec - y->tv_sec;
result->tv_usec = x->tv_usec - y->tv_usec;
/* Return 1 if result is negative. */
return x->tv_sec < y->tv_sec;
}
struct rusage getrusage_or_die() {
struct rusage rs;
int ret = getrusage(RUSAGE_SELF, &rs);
if (ret != 0) {
cerr << "rusage failed: " << strerror(errno) << endl;
exit(-1);
}
return rs;
}
#ifdef HAVE_CXA_DEMANGLE
string demangle(const string& name) {
char buf[1024];
unsigned int size = 1024;
int status;
char* res = abi::__cxa_demangle(
name.c_str(), buf, &size, &status);
return res;
}
#else
string demangle(const string& name) { return name; }
#endif
static vector<cxxmph::Benchmark*> g_benchmarks;
} // anonymous namespace
namespace cxxmph {
/* static */ void Benchmark::Register(Benchmark* bm) {
if (bm->name().empty()) {
string name = demangle(typeid(*bm).name());
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bm->set_name(name);
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}
g_benchmarks.push_back(bm);
}
/* static */ void Benchmark::RunAll() {
for (auto it = g_benchmarks.begin(); it != g_benchmarks.end(); ++it) {
(*it)->MeasureRun();
delete *it;
}
}
void Benchmark::MeasureRun() {
struct rusage begin = getrusage_or_die();
Run(iters_);
struct rusage end = getrusage_or_die();
struct timeval utime;
timeval_subtract(&utime, &end.ru_utime, &begin.ru_utime);
struct timeval stime;
timeval_subtract(&stime, &end.ru_stime, &begin.ru_stime);
printf("Benchmark: %s\n", name().c_str());
printf("User time used : %ld.%06ld\n", utime.tv_sec, utime.tv_usec);
printf("System time used: %ld.%06ld\n", stime.tv_sec, stime.tv_usec);
printf("\n");
}
} // namespace cxxmph