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// Copyright 2017 The Emscripten Authors. All rights reserved.
// Emscripten is available under two separate licenses, the MIT license and the
// University of Illinois/NCSA Open Source License. Both these licenses can be
// found in the LICENSE file.
#include <memory.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <algorithm>
#ifdef __EMSCRIPTEN__
#include <emscripten/emscripten.h>
#endif
#include "tick.h"
// #define BENCHMARK_FOREIGN_FUNCTION
#if defined(BENCHMARK_FOREIGN_FUNCTION) && defined(__EMSCRIPTEN__)
extern "C"
{
int foreignFunctionThatTakesThreeParameters(int a, int b, int c);
}
#else
int foreignCounter = 0;
int __attribute__((noinline)) foreignFunctionThatTakesThreeParameters(int a, int b, int c)
{
foreignCounter += a + b + c;
return foreignCounter;
}
#endif
typedef int (*FuncPtrType)(int, int, int);
FuncPtrType pointerToFunction = 0;
int numRunsDone = 0;
const int totalRuns = 1000;
tick_t accumulatedTicks = 0;
tick_t allTicks[totalRuns] = {};
double averageBestPercentileMsecs(double p)
{
tick_t acc = 0;
int numSamples = (int)(totalRuns*p);
for(int i = 0; i < numSamples; ++i)
acc += allTicks[i];
return acc * 1000.0 / numSamples / ticks_per_sec();
}
double averageWorstPercentileMsecs(double p)
{
tick_t acc = 0;
int numSamples = (int)(totalRuns*p);
for(int i = 0; i < numSamples; ++i)
acc += allTicks[totalRuns-1-i];
return acc * 1000.0 / numSamples / ticks_per_sec();
}
int counter = 0;
void __attribute__((noinline)) main_loop()
{
tick_t t0 = tick();
for(int i = 0; i < 500000; ++i)
{
#if BENCHMARK_FUNCTION_POINTER
counter += pointerToFunction(i, i+1, i+2);
#else
counter += foreignFunctionThatTakesThreeParameters(i, i+1, i+2);
#endif
}
tick_t t1 = tick();
allTicks[numRunsDone] = t1 - t0;
++numRunsDone;
accumulatedTicks += t1 - t0;
printf("Run %d: %f msecs.\n", numRunsDone, (t1 - t0) * 1000.0 / ticks_per_sec());
if (numRunsDone >= totalRuns)
{
double accumulatedTimeMsecs = accumulatedTicks * 1000.0 / ticks_per_sec();
std::sort(allTicks, allTicks + totalRuns);
printf("Total: %d runs, avg. %f msecs per run. Counter: %d.\n", totalRuns, accumulatedTimeMsecs / totalRuns, counter);
printf("Best run: %f msecs.\n", allTicks[0] * 1000.0 / ticks_per_sec());
printf("1%% Best percentile: %f msecs. 1%% Worst percentile: %f msecs.\n", averageBestPercentileMsecs(0.01), averageWorstPercentileMsecs(0.01));
printf("5%% Best percentile: %f msecs. 5%% Worst percentile: %f msecs.\n", averageBestPercentileMsecs(0.05), averageWorstPercentileMsecs(0.05));
printf("10%% Best percentile: %f msecs. 10%% Worst percentile: %f msecs.\n", averageBestPercentileMsecs(0.10), averageWorstPercentileMsecs(0.10));
printf("25%% Best percentile: %f msecs. 25%% Worst percentile: %f msecs.\n", averageBestPercentileMsecs(0.25), averageWorstPercentileMsecs(0.25));
printf("50%% Best percentile: %f msecs. 50%% Worst percentile: %f msecs.\n", averageBestPercentileMsecs(0.50), averageWorstPercentileMsecs(0.50));
printf("75%% Best percentile: %f msecs. 75%% Worst percentile: %f msecs.\n", averageBestPercentileMsecs(0.75), averageWorstPercentileMsecs(0.75));
printf("95%% Best percentile: %f msecs. 95%% Worst percentile: %f msecs.\n", averageBestPercentileMsecs(0.95), averageWorstPercentileMsecs(0.95));
printf("100%% Best/Worst percentile (==average over all samples): %f msecs.\n", averageBestPercentileMsecs(1.00));
printf("Median run: %f msecs.\n", allTicks[totalRuns/2] * 1000.0 / ticks_per_sec());
printf("Total time: %f\n", accumulatedTimeMsecs);
#ifdef __EMSCRIPTEN__
emscripten_cancel_main_loop();
#endif
exit(0);
}
}
int main()
{
// Insist dynamic initialization that the compiler can't possibly optimize away.
pointerToFunction = (tick() == 0 && tick() == 1000000) ? 0 : &foreignFunctionThatTakesThreeParameters;
#if defined(__EMSCRIPTEN__) && !defined(BUILD_FOR_SHELL)
emscripten_set_main_loop(main_loop, 0, 0);
#else
for(int i = 0; i < totalRuns; ++i)
main_loop();
#endif
}
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