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Print mean/stddev of the # of iterations.

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pleroy 2014-06-04 21:54:45 +02:00
parent ffcdc94c7b
commit e189ec0283
1 changed files with 23 additions and 8 deletions
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31
src/benchmark.cc
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@ -12,6 +12,8 @@
// See the License for the specific language governing permissions and
// limitations under the License.
#include <algorithm>
#include "benchmark/benchmark.h"
#include "benchmark/macros.h"
#include "colorprint.h"
@ -258,11 +260,15 @@ void ComputeStats(const std::vector<BenchmarkReporter::Run>& reports,
Stat1MinMax_d(it->max_heapbytes_used, it->iterations);
}
// Get the data from the accumulator to BenchmarkRunData's.
// Get the data from the accumulator to BenchmarkRunData's. In the
// computations below we must multiply by the number of iterations since
// PrintRunData will divide by it.
mean_data->benchmark_name = reports[0].benchmark_name + "_mean";
mean_data->iterations = real_accumulated_time_stat.numSamples();
mean_data->real_accumulated_time = real_accumulated_time_stat.sum();
mean_data->cpu_accumulated_time = cpu_accumulated_time_stat.sum();
mean_data->iterations = iterations_stat.Mean();
mean_data->real_accumulated_time = real_accumulated_time_stat.Mean() *
mean_data->iterations;
mean_data->cpu_accumulated_time = cpu_accumulated_time_stat.Mean() *
mean_data->iterations;
mean_data->bytes_per_second = bytes_per_second_stat.Mean();
mean_data->items_per_second = items_per_second_stat.Mean();
mean_data->max_heapbytes_used = max_heapbytes_used_stat.max();
@ -278,9 +284,17 @@ void ComputeStats(const std::vector<BenchmarkReporter::Run>& reports,
stddev_data->benchmark_name = reports[0].benchmark_name + "_stddev";
stddev_data->report_label = mean_data->report_label;
stddev_data->iterations = real_accumulated_time_stat.numSamples();
// We multiply by the number of iterations since PrintRunData expects a total
// time.
stddev_data->iterations = iterations_stat.StdDev();
// Ugly hack here! iterations_stat.StdDev() above may be 0 if all the
// repetitions have the same number of iterations. Blindly multiplying by 0
// in the computation of real/cpu_accumulated_time below would lead to 0/0 in
// PrintRunData. To avoid this, we set the number of iterations to something
// negative here, and PrintRunData prints it as 0 (see the std::max there).
// Thus the stddev of both the number of iterations and the times are printed
// correctly.
if (stddev_data->iterations == 0) {
stddev_data->iterations = -1;
}
stddev_data->real_accumulated_time = real_accumulated_time_stat.StdDev() *
stddev_data->iterations;
stddev_data->cpu_accumulated_time = cpu_accumulated_time_stat.StdDev() *
@ -473,7 +487,8 @@ void ConsoleReporter::PrintRunData(const BenchmarkReporter::Run& result) const {
(static_cast<double>(result.iterations)),
(result.cpu_accumulated_time * 1e9) /
(static_cast<double>(result.iterations)));
ColorPrintf(COLOR_CYAN, "%10lld", result.iterations);
// See ComputeStats for why a negative value is printed as 0.
ColorPrintf(COLOR_CYAN, "%10lld", std::max(0LL, result.iterations));
ColorPrintf(COLOR_DEFAULT, "%*s %*s %s %s\n",
13, rate.c_str(),
18, items.c_str(),