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// Copyright 2011 Google Inc. All Rights Reserved.
//
// 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 "metrics.h"
#include <errno.h>
#include <stdio.h>
#include <string.h>
#ifndef _WIN32
#include <sys/time.h>
#else
#include <windows.h>
#endif
#include <algorithm>
#include "util.h"
Metrics* g_metrics = NULL;
namespace {
#ifndef _WIN32
/// Compute a platform-specific high-res timer value that fits into an int64.
int64_t HighResTimer() {
timeval tv;
if (gettimeofday(&tv, NULL) < 0)
Fatal("gettimeofday: %s", strerror(errno));
return (int64_t)tv.tv_sec * 1000*1000 + tv.tv_usec;
}
/// Convert a delta of HighResTimer() values to microseconds.
int64_t TimerToMicros(int64_t dt) {
// No conversion necessary.
return dt;
}
#else
int64_t LargeIntegerToInt64(const LARGE_INTEGER& i) {
return ((int64_t)i.HighPart) << 32 | i.LowPart;
}
int64_t HighResTimer() {
LARGE_INTEGER counter;
if (!QueryPerformanceCounter(&counter))
Fatal("QueryPerformanceCounter: %s", GetLastErrorString().c_str());
return LargeIntegerToInt64(counter);
}
int64_t TimerToMicros(int64_t dt) {
static int64_t ticks_per_sec = 0;
if (!ticks_per_sec) {
LARGE_INTEGER freq;
if (!QueryPerformanceFrequency(&freq))
Fatal("QueryPerformanceFrequency: %s", GetLastErrorString().c_str());
ticks_per_sec = LargeIntegerToInt64(freq);
}
// dt is in ticks. We want microseconds.
return (dt * 1000000) / ticks_per_sec;
}
#endif
} // anonymous namespace
ScopedMetric::ScopedMetric(Metric* metric) {
metric_ = metric;
if (!metric_)
return;
start_ = HighResTimer();
}
ScopedMetric::~ScopedMetric() {
if (!metric_)
return;
metric_->count++;
int64_t dt = TimerToMicros(HighResTimer() - start_);
metric_->sum += dt;
}
Metric* Metrics::NewMetric(const string& name) {
Metric* metric = new Metric;
metric->name = name;
metric->count = 0;
metric->sum = 0;
metrics_.push_back(metric);
return metric;
}
void Metrics::Report() {
int width = 0;
for (vector<Metric*>::iterator i = metrics_.begin();
i != metrics_.end(); ++i) {
width = max((int)(*i)->name.size(), width);
}
printf("%-*s\t%-6s\t%-9s\t%s\n", width,
"metric", "count", "avg (us)", "total (ms)");
for (vector<Metric*>::iterator i = metrics_.begin();
i != metrics_.end(); ++i) {
Metric* metric = *i;
double total = metric->sum / (double)1000;
double avg = metric->sum / (double)metric->count;
printf("%-*s\t%-6d\t%-8.1f\t%.1f\n", width, metric->name.c_str(),
metric->count, avg, total);
}
}
uint64_t Stopwatch::Now() const {
return TimerToMicros(HighResTimer());
}
int64_t GetTimeMillis() {
return TimerToMicros(HighResTimer()) / 1000;
}
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