143 lines
3.5 KiB
C++
143 lines
3.5 KiB
C++
#include "benchmark.h"
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#include <cerrno>
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#include <cstring>
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#include <cstdio>
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#include <memory>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <iomanip>
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#include <iostream>
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#include <sstream>
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#include <vector>
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using std::cerr;
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using std::cout;
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using std::endl;
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using std::setfill;
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using std::setw;
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using std::string;
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using std::ostringstream;
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using std::vector;
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namespace {
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/* Subtract the `struct timeval' values X and Y,
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storing the result in RESULT.
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Return 1 if the difference is negative, otherwise 0. */
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int timeval_subtract (
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struct timeval *result, struct timeval *x, struct timeval* y) {
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/* Perform the carry for the later subtraction by updating y. */
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if (x->tv_usec < y->tv_usec) {
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int nsec = (y->tv_usec - x->tv_usec) / 1000000 + 1;
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y->tv_usec -= 1000000 * nsec;
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y->tv_sec += nsec;
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}
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if (x->tv_usec - y->tv_usec > 1000000) {
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int nsec = (x->tv_usec - y->tv_usec) / 1000000;
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y->tv_usec += 1000000 * nsec;
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y->tv_sec -= nsec;
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}
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/* Compute the time remaining to wait.
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tv_usec is certainly positive. */
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result->tv_sec = x->tv_sec - y->tv_sec;
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result->tv_usec = x->tv_usec - y->tv_usec;
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/* Return 1 if result is negative. */
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return x->tv_sec < y->tv_sec;
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}
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// C++ iostream is terrible for formatting.
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string timeval_to_string(timeval tv) {
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ostringstream out;
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out << setfill(' ') << setw(3) << tv.tv_sec << '.';
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out << setfill('0') << setw(6) << tv.tv_usec;
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return out.str();
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}
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struct rusage getrusage_or_die() {
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struct rusage rs;
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int ret = getrusage(RUSAGE_SELF, &rs);
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if (ret != 0) {
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cerr << "rusage failed: " << strerror(errno) << endl;
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exit(-1);
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}
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return rs;
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}
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struct timeval gettimeofday_or_die() {
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struct timeval tv;
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int ret = gettimeofday(&tv, NULL);
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if (ret != 0) {
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cerr << "gettimeofday failed: " << strerror(errno) << endl;
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exit(-1);
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}
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return tv;
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}
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#ifdef HAVE_CXA_DEMANGLE
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string demangle(const string& name) {
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char buf[1024];
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unsigned int size = 1024;
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int status;
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char* res = abi::__cxa_demangle(
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name.c_str(), buf, &size, &status);
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return res;
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}
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#else
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string demangle(const string& name) { return name; }
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#endif
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static vector<cxxmph::Benchmark*> g_benchmarks;
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} // anonymous namespace
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namespace cxxmph {
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/* static */ void Benchmark::Register(Benchmark* bm) {
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if (bm->name().empty()) {
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string name = demangle(typeid(*bm).name());
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bm->set_name(name);
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}
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g_benchmarks.push_back(bm);
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}
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/* static */ void Benchmark::RunAll() {
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for (int i = 0; i < g_benchmarks.size(); ++i) {
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std::auto_ptr<Benchmark> bm(g_benchmarks[i]);
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if (!bm->SetUp()) {
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cerr << "Set up phase for benchmark "
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<< bm->name() << " failed." << endl;
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continue;
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}
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bm->MeasureRun();
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bm->TearDown();
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}
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}
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void Benchmark::MeasureRun() {
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struct timeval walltime_begin = gettimeofday_or_die();
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struct rusage begin = getrusage_or_die();
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Run();
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struct rusage end = getrusage_or_die();
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struct timeval walltime_end = gettimeofday_or_die();
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struct timeval utime;
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timeval_subtract(&utime, &end.ru_utime, &begin.ru_utime);
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struct timeval stime;
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timeval_subtract(&stime, &end.ru_stime, &begin.ru_stime);
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struct timeval wtime;
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timeval_subtract(&wtime, &walltime_end, &walltime_begin);
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cout << "Benchmark: " << name_ << endl;
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cout << "CPU User time : " << timeval_to_string(utime) << endl;
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cout << "CPU System time: " << timeval_to_string(stime) << endl;
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cout << "Wall clock time: " << timeval_to_string(wtime) << endl;
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cout << endl;
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}
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} // namespace cxxmph
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