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bench: switch to std::chrono for time measurements

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std::chrono removes portability issues.

Rather than storing doubles, store the untouched time_points. Then
convert to nanoseconds for display. This allows for maximum precision, while
keeping results comparable between differing hardware/operating systems.

Also, display full nanosecond counts rather than sub-second floats.
This commit is contained in:
Cory Fields
2017-10-25 16:38:24 -04:00
parent 57ee73990f
commit c515d266ec
3 changed files with 31 additions and 29 deletions
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7
src/bench/rollingbloom.cpp
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@@ -6,7 +6,6 @@
#include "bench.h"
#include "bloom.h"
#include "utiltime.h"
static void RollingBloom(benchmark::State& state)
{
@@ -23,10 +22,10 @@ static void RollingBloom(benchmark::State& state)
data[2] = count >> 16;
data[3] = count >> 24;
if (countnow == nEntriesPerGeneration) {
int64_t b = GetTimeMicros();
auto b = benchmark::clock::now();
filter.insert(data);
int64_t e = GetTimeMicros();
std::cout << "RollingBloom-refresh,1," << (e-b)*0.000001 << "," << (e-b)*0.000001 << "," << (e-b)*0.000001 << "\n";
auto total = std::chrono::duration_cast<std::chrono::nanoseconds>(benchmark::clock::now() - b).count();
std::cout << "RollingBloom-refresh,1," << total << "," << total << "," << total << "\n";
countnow = 0;
} else {
filter.insert(data);