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// Copyright 2009 The RE2 Authors. All Rights Reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <algorithm>
#include <chrono>
#include <thread>
#include "util/util.h"
#include "util/flags.h"
#include "util/benchmark.h"
#include "re2/re2.h"
DEFINE_string(test_tmpdir, "/var/tmp", "temp directory");
#ifdef _WIN32
#define snprintf _snprintf
#endif
using testing::Benchmark;
static Benchmark* benchmarks[10000];
static int nbenchmarks;
void Benchmark::Register() {
benchmarks[nbenchmarks] = this;
if(lo < 1)
lo = 1;
if(hi < lo)
hi = lo;
nbenchmarks++;
}
static int64_t nsec() {
return std::chrono::duration_cast<std::chrono::nanoseconds>(
std::chrono::steady_clock::now().time_since_epoch()).count();
}
static int64_t bytes;
static int64_t ns;
static int64_t t0;
static int64_t items;
void SetBenchmarkBytesProcessed(int64_t x) {
bytes = x;
}
void StopBenchmarkTiming() {
if(t0 != 0)
ns += nsec() - t0;
t0 = 0;
}
void StartBenchmarkTiming() {
if(t0 == 0)
t0 = nsec();
}
void SetBenchmarkItemsProcessed(int n) {
items = n;
}
void BenchmarkMemoryUsage() {
// TODO(rsc): Implement.
}
int NumCPUs() {
return static_cast<int>(std::thread::hardware_concurrency());
}
static void runN(Benchmark *b, int n, int siz) {
bytes = 0;
items = 0;
ns = 0;
t0 = nsec();
if(b->fn)
b->fn(n);
else if(b->fnr)
b->fnr(n, siz);
else {
fprintf(stderr, "%s: missing function\n", b->name);
abort();
}
if(t0 != 0)
ns += nsec() - t0;
}
static int round(int n) {
int base = 1;
while(base*10 < n)
base *= 10;
if(n < 2*base)
return 2*base;
if(n < 5*base)
return 5*base;
return 10*base;
}
void RunBench(Benchmark* b, int nthread, int siz) {
int n, last;
// TODO(rsc): Threaded benchmarks.
if(nthread != 1)
return;
// run once in case it's expensive
n = 1;
runN(b, n, siz);
while(ns < (int)1e9 && n < (int)1e9) {
last = n;
if(ns/n == 0)
n = (int)1e9;
else
n = (int)1e9 / static_cast<int>(ns/n);
n = std::max(last+1, std::min(n+n/2, 100*last));
n = round(n);
runN(b, n, siz);
}
char mb[100];
char suf[100];
mb[0] = '\0';
suf[0] = '\0';
if(ns > 0 && bytes > 0)
snprintf(mb, sizeof mb, "\t%7.2f MB/s", ((double)bytes/1e6)/((double)ns/1e9));
if(b->fnr || b->lo != b->hi) {
if(siz >= (1<<20))
snprintf(suf, sizeof suf, "/%dM", siz/(1<<20));
else if(siz >= (1<<10))
snprintf(suf, sizeof suf, "/%dK", siz/(1<<10));
else
snprintf(suf, sizeof suf, "/%d", siz);
}
printf("%s%s\t%8lld\t%10lld ns/op%s\n", b->name, suf, (long long)n, (long long)ns/n, mb);
fflush(stdout);
}
static int match(const char* name, int argc, const char** argv) {
if(argc == 1)
return 1;
for(int i = 1; i < argc; i++)
if(RE2::PartialMatch(name, argv[i]))
return 1;
return 0;
}
int main(int argc, const char** argv) {
for(int i = 0; i < nbenchmarks; i++) {
Benchmark* b = benchmarks[i];
if(match(b->name, argc, argv))
for(int j = b->threadlo; j <= b->threadhi; j++)
for(int k = std::max(b->lo, 1); k <= std::max(b->hi, 1); k<<=1)
RunBench(b, j, k);
}
}
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