1 files changed, 237 insertions, 0 deletions
diff --git a/bench/tensors/benchmark_main.cc b/bench/tensors/benchmark_main.cc
new file mode 100644
index 000000000..1efa0dbad
--- /dev/null
+++ b/bench/tensors/benchmark_main.cc
@@ -0,0 +1,237 @@
+/*
+ * 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;
+}