1
Fork 0
turbonss/cxxmph/benchmark.cc

143 lines
3.5 KiB
C++

#include "benchmark.h"
#include <cerrno>
#include <cstring>
#include <cstdio>
#include <memory>
#include <sys/time.h>
#include <sys/resource.h>
#include <iomanip>
#include <iostream>
#include <sstream>
#include <vector>
using std::cerr;
using std::cout;
using std::endl;
using std::setfill;
using std::setw;
using std::string;
using std::ostringstream;
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;
}
// C++ iostream is terrible for formatting.
string timeval_to_string(timeval tv) {
ostringstream out;
out << setfill(' ') << setw(3) << tv.tv_sec << '.';
out << setfill('0') << setw(6) << tv.tv_usec;
return out.str();
}
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;
}
struct timeval gettimeofday_or_die() {
struct timeval tv;
int ret = gettimeofday(&tv, NULL);
if (ret != 0) {
cerr << "gettimeofday failed: " << strerror(errno) << endl;
exit(-1);
}
return tv;
}
#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());
bm->set_name(name);
}
g_benchmarks.push_back(bm);
}
/* static */ void Benchmark::RunAll() {
for (int i = 0; i < g_benchmarks.size(); ++i) {
std::auto_ptr<Benchmark> bm(g_benchmarks[i]);
if (!bm->SetUp()) {
cerr << "Set up phase for benchmark "
<< bm->name() << " failed." << endl;
continue;
}
bm->MeasureRun();
bm->TearDown();
}
}
void Benchmark::MeasureRun() {
struct timeval walltime_begin = gettimeofday_or_die();
struct rusage begin = getrusage_or_die();
Run();
struct rusage end = getrusage_or_die();
struct timeval walltime_end = gettimeofday_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);
struct timeval wtime;
timeval_subtract(&wtime, &walltime_end, &walltime_begin);
cout << "Benchmark: " << name_ << endl;
cout << "CPU User time : " << timeval_to_string(utime) << endl;
cout << "CPU System time: " << timeval_to_string(stime) << endl;
cout << "Wall clock time: " << timeval_to_string(wtime) << endl;
cout << endl;
}
} // namespace cxxmph