ROC profiler prototype sources importing

test/util/perf_timer.cpp

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+/**********************************************************************
+Copyright ©2013 Advanced Micro Devices, Inc. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without modification, are permitted
+provided that the following conditions are met:
+
+<95>    Redistributions of source code must retain the above copyright notice, this list of
+conditions and the following disclaimer.
+<95>    Redistributions in binary form must reproduce the above copyright notice, this list of
+conditions and the following disclaimer in the documentation and/or
+ other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
+IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY
+ DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+********************************************************************/
+
+#include "util/perf_timer.h"
+
+PerfTimer::PerfTimer() { freq_in_100mhz_ = MeasureTSCFreqHz(); }
+
+PerfTimer::~PerfTimer() {
+  while (!timers_.empty()) {
+    Timer* temp = timers_.back();
+    timers_.pop_back();
+    delete temp;
+  }
+}
+
+// New cretaed timer instantance index will be returned
+int PerfTimer::CreateTimer() {
+  Timer* newTimer = new Timer;
+  newTimer->start = 0;
+  newTimer->clocks = 0;
+
+#ifdef _WIN32
+  QueryPerformanceFrequency((LARGE_INTEGER*)&newTimer->freq);
+#else
+  newTimer->freq = (long long)1.0E3;
+#endif
+
+  /* Push back the address of new Timer instance created */
+  timers_.push_back(newTimer);
+  return (int)(timers_.size() - 1);
+}
+
+int PerfTimer::StartTimer(int index) {
+  if (index >= (int)timers_.size()) {
+    Error("Cannot reset timer. Invalid handle.");
+    return FAILURE;
+  }
+
+#ifdef _WIN32
+// General Windows timing method
+#ifndef _AMD
+  long long tmpStart;
+  QueryPerformanceCounter((LARGE_INTEGER*)&(tmpStart));
+  timers_[index]->start = (double)tmpStart;
+#else
+// AMD Windows timing method
+#endif
+#else
+// General Linux timing method
+#ifndef _AMD
+  struct timeval s;
+  gettimeofday(&s, 0);
+  timers_[index]->start = s.tv_sec * 1.0E3 + ((double)(s.tv_usec / 1.0E3));
+#else
+  // AMD timing method
+  unsigned int unused;
+  timers_[index]->start = __rdtscp(&unused);
+#endif
+#endif
+
+  return SUCCESS;
+}
+
+
+int PerfTimer::StopTimer(int index) {
+  double n = 0;
+  if (index >= (int)timers_.size()) {
+    Error("Cannot reset timer. Invalid handle.");
+    return FAILURE;
+  }
+#ifdef _WIN32
+#ifndef _AMD
+  long long n1;
+  QueryPerformanceCounter((LARGE_INTEGER*)&(n1));
+  n = (double)n1;
+#else
+// AMD Window Timing
+#endif
+
+#else
+// General Linux timing method
+#ifndef _AMD
+  struct timeval s;
+  gettimeofday(&s, 0);
+  n = s.tv_sec * 1.0E3 + (double)(s.tv_usec / 1.0E3);
+#else
+  // AMD Linux timing
+  unsigned int unused;
+  n = __rdtscp(&unused);
+#endif
+#endif
+
+  n -= timers_[index]->start;
+  timers_[index]->start = 0;
+
+#ifndef _AMD
+  timers_[index]->clocks += n;
+#else
+  // timers_[index]->clocks += 10 * n / freq_in_100mhz_; // unit is ns
+  timers_[index]->clocks += 1.0E-6 * 10 * n / freq_in_100mhz_;  // convert to ms
+#endif
+
+  return SUCCESS;
+}
+
+void PerfTimer::Error(std::string str) { std::cout << str << std::endl; }
+
+
+double PerfTimer::ReadTimer(int index) {
+  if (index >= (int)timers_.size()) {
+    Error("Cannot read timer. Invalid handle.");
+    return FAILURE;
+  }
+
+  double reading = double(timers_[index]->clocks);
+
+  reading = double(reading / timers_[index]->freq);
+
+  return reading;
+}
+
+
+uint64_t PerfTimer::CoarseTimestampUs() {
+#ifdef _WIN32
+  uint64_t freqHz, ticks;
+  QueryPerformanceFrequency((LARGE_INTEGER*)&freqHz);
+  QueryPerformanceCounter((LARGE_INTEGER*)&ticks);
+
+  // Scale numerator and divisor until (ticks * 1000000) fits in uint64_t.
+  while (ticks > (1ULL << 44)) {
+    ticks /= 16;
+    freqHz /= 16;
+  }
+
+  return (ticks * 1000000) / freqHz;
+#else
+  struct timespec ts;
+  clock_gettime(CLOCK_MONOTONIC_RAW, &ts);
+  return uint64_t(ts.tv_sec) * 1000000 + ts.tv_nsec / 1000;
+#endif
+}
+
+uint64_t PerfTimer::MeasureTSCFreqHz() {
+  // Make a coarse interval measurement of TSC ticks for 1 gigacycles.
+  unsigned int unused;
+  uint64_t tscTicksEnd;
+
+  uint64_t coarseBeginUs = CoarseTimestampUs();
+  uint64_t tscTicksBegin = __rdtscp(&unused);
+  do {
+    tscTicksEnd = __rdtscp(&unused);
+  } while (tscTicksEnd - tscTicksBegin < 1000000000);
+
+  uint64_t coarseEndUs = CoarseTimestampUs();
+
+  // Compute the TSC frequency and round to nearest 100MHz.
+  uint64_t coarseIntervalNs = (coarseEndUs - coarseBeginUs) * 1000;
+  uint64_t tscIntervalTicks = tscTicksEnd - tscTicksBegin;
+  return (tscIntervalTicks * 10 + (coarseIntervalNs / 2)) / coarseIntervalNs;
+}