Quelle benchmark_main.cc Sprache: C

/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*      http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "benchmark.h"
#include <regex.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <string>
#include <inttypes.h>
#include <time.h>
#include <map>

static int64_t g_flops_processed;
static int64_t g_benchmark_total_time_ns;
static int64_t g_benchmark_start_time_ns;
typedef std::map<std::string, ::testing::Benchmark*> BenchmarkMap;
typedef BenchmarkMap::iterator BenchmarkMapIt;

BenchmarkMap& gBenchmarks() {
  static BenchmarkMap g_benchmarks;
  return g_benchmarks;
}

static int g_name_column_width = 20;

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;
}

#ifdef __APPLE__
  #include <mach/mach_time.h>
  static mach_timebase_info_data_t g_time_info;
  static void __attribute__((constructor)) init_info() {
    mach_timebase_info(&g_time_info);
  }
#endif

static int64_t NanoTime() {
#if defined(__APPLE__)
  uint64_t t = mach_absolute_time();
  return t * g_time_info.numer / g_time_info.denom;
#else
  struct timespec t;
  t.tv_sec = t.tv_nsec = 0;
  clock_gettime(CLOCK_MONOTONIC, &t);
  return static_cast<int64_t>(t.tv_sec) * 1000000000LL + t.tv_nsec;
#endif
}

namespace testing {
Benchmark* Benchmark::Arg(int arg) {
  args_.push_back(arg);
  return this;
}

Benchmark* Benchmark::Range(int lo, int hi) {
  const int kRangeMultiplier = 8;
  if (hi < lo) {
    int temp = hi;
    hi = lo;
    lo = temp;
  }
  while (lo < hi) {
    args_.push_back(lo);
    lo *= kRangeMultiplier;
  }
  // We always run the hi number.
  args_.push_back(hi);
  return this;
}

const char* Benchmark::Name() {
  return name_;
}
bool Benchmark::ShouldRun(int argc, char* argv[]) {
  if (argc == 1) {
    return true;  // With no arguments, we run all benchmarks.
  }
  // Otherwise, we interpret each argument as a regular expression and
  // see if any of our benchmarks match.
  for (int i = 1; i < argc; i++) {
    regex_t re;
    if (regcomp(&re, argv[i], 0) != 0) {
      fprintf(stderr, "couldn't compile \"%s\" as a regular expression!\n", argv[i]);
      exit(EXIT_FAILURE);
    }
    int match = regexec(&re, name_, 0, NULL, 0);
    regfree(&re);
    if (match != REG_NOMATCH) {
      return true;
    }
  }
  return false;
}
void Benchmark::Register(const char* name, void (*fn)(int), void (*fn_range)(int, int)) {
  name_ = name;
  fn_ = fn;
  fn_range_ = fn_range;
  if (fn_ == NULL && fn_range_ == NULL) {
    fprintf(stderr, "%s: missing function\n", name_);
    exit(EXIT_FAILURE);
  }
  gBenchmarks().insert(std::make_pair(name, this));
}
void Benchmark::Run() {
  if (fn_ != NULL) {
    RunWithArg(0);
  } else {
    if (args_.empty()) {
      fprintf(stderr, "%s: no args!\n", name_);
      exit(EXIT_FAILURE);
    }
    for (size_t i = 0; i < args_.size(); ++i) {
      RunWithArg(args_[i]);
    }
  }
}
void Benchmark::RunRepeatedlyWithArg(int iterations, int arg) {
  g_flops_processed = 0;
  g_benchmark_total_time_ns = 0;
  g_benchmark_start_time_ns = NanoTime();
  if (fn_ != NULL) {
    fn_(iterations);
  } else {
    fn_range_(iterations, arg);
  }
  if (g_benchmark_start_time_ns != 0) {
    g_benchmark_total_time_ns += NanoTime() - g_benchmark_start_time_ns;
  }
}
void Benchmark::RunWithArg(int arg) {
  // run once in case it's expensive
  int iterations = 1;
  RunRepeatedlyWithArg(iterations, arg);
  while (g_benchmark_total_time_ns < 1e9 && iterations < 1e9) {
    int last = iterations;
    if (g_benchmark_total_time_ns/iterations == 0) {
      iterations = 1e9;
    } else {
      iterations = 1e9 / (g_benchmark_total_time_ns/iterations);
    }
    iterations = std::max(last + 1, std::min(iterations + iterations/2, 100*last));
    iterations = Round(iterations);
    RunRepeatedlyWithArg(iterations, arg);
  }
  char throughput[100];
  throughput[0] = '\0';
  if (g_benchmark_total_time_ns > 0 && g_flops_processed > 0) {
    double mflops_processed = static_cast<double>(g_flops_processed)/1e6;
    double seconds = static_cast<double>(g_benchmark_total_time_ns)/1e9;
    snprintf(throughput, sizeof(throughput), " %8.2f MFlops/s", mflops_processed/seconds);
  }
  char full_name[100];
  if (fn_range_ != NULL) {
    if (arg >= (1<<20)) {
      snprintf(full_name, sizeof(full_name), "%s/%dM", name_, arg/(1<<20));
    } else if (arg >= (1<<10)) {
      snprintf(full_name, sizeof(full_name), "%s/%dK", name_, arg/(1<<10));
    } else {
      snprintf(full_name, sizeof(full_name), "%s/%d", name_, arg);
    }
  } else {
    snprintf(full_name, sizeof(full_name), "%s", name_);
  }
  printf("%-*s %10d %10" PRId64 "%s\n", g_name_column_width, full_name,
         iterations, g_benchmark_total_time_ns/iterations, throughput);
  fflush(stdout);
}
}  // namespace testing
void SetBenchmarkFlopsProcessed(int64_t x) {
  g_flops_processed = x;
}
void StopBenchmarkTiming() {
  if (g_benchmark_start_time_ns != 0) {
    g_benchmark_total_time_ns += NanoTime() - g_benchmark_start_time_ns;
  }
  g_benchmark_start_time_ns = 0;
}
void StartBenchmarkTiming() {
  if (g_benchmark_start_time_ns == 0) {
    g_benchmark_start_time_ns = NanoTime();
  }
}
int main(int argc, char* argv[]) {
  if (gBenchmarks().empty()) {
    fprintf(stderr, "No benchmarks registered!\n");
    exit(EXIT_FAILURE);
  }
  for (BenchmarkMapIt it = gBenchmarks().begin(); it != gBenchmarks().end(); ++it) {
    int name_width = static_cast<int>(strlen(it->second->Name()));
    g_name_column_width = std::max(g_name_column_width, name_width);
  }
  bool need_header = true;
  for (BenchmarkMapIt it = gBenchmarks().begin(); it != gBenchmarks().end(); ++it) {
    ::testing::Benchmark* b = it->second;
    if (b->ShouldRun(argc, argv)) {
      if (need_header) {
        printf("%-*s %10s %10s\n", g_name_column_width, "", "iterations", "ns/op");
        fflush(stdout);
        need_header = false;
      }
      b->Run();
    }
  }
  if (need_header) {
    fprintf(stderr, "No matching benchmarks!\n");
    fprintf(stderr, "Available benchmarks:\n");
    for (BenchmarkMapIt it = gBenchmarks().begin(); it != gBenchmarks().end(); ++it) {
      fprintf(stderr, " %s\n", it->second->Name());
    }
    exit(EXIT_FAILURE);
  }
  return 0;
}

quality89%

¤ Dauer der Verarbeitung: 0.14 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

sprechenden Kalenders