| # Copyright 2018 The Chromium Authors. All rights reserved. |
| # Use of this source code is governed by a BSD-style license that can be |
| # found in the LICENSE file. |
| """This script implements a few IntelPowerGadget related helper functions. |
| |
| This script only works on Windows/Mac with Intel CPU. Intel Power Gadget needs |
| to be installed on the machine before this script works. The software can be |
| downloaded from: |
| https://software.intel.com/en-us/articles/intel-power-gadget |
| |
| An easy way to use the APIs are: |
| 1) Launch your program. |
| 2) Call RunIPG() with no args. It will automatically locate the IPG installed |
| on the machine. |
| 3) Call AnalyzeIPGLogFile() with no args. It will analyze the default IPG log |
| file, which is PowerLog.csv at current dir; then it will print out the power |
| usage summary. If you want to skip a few seconds of the power log data, say, |
| 5 seconds, call AnalyzeIPGLogFile(skip_in_sec=5). |
| """ |
| |
| from __future__ import print_function |
| |
| import datetime |
| import json |
| import logging |
| import os |
| import subprocess |
| import sys |
| |
| |
| def LocateIPG(): |
| if sys.platform == 'win32': |
| ipg_dir = os.getenv('IPG_Dir') |
| if not ipg_dir: |
| raise Exception("No env IPG_Dir") |
| gadget_path = os.path.join(ipg_dir, "PowerLog3.0.exe") |
| if not os.path.isfile(gadget_path): |
| raise Exception("Can't locate Intel Power Gadget at " + gadget_path) |
| return gadget_path |
| if sys.platform == 'darwin': |
| return '/Applications/Intel Power Gadget/PowerLog' |
| raise Exception("Only supported on Windows/Mac") |
| |
| |
| def GenerateIPGLogFilename(log_prefix='PowerLog', |
| log_dir=None, |
| current_run=1, |
| total_runs=1, |
| timestamp=False): |
| # If all args take default value, it is the IPG's default log path. |
| log_dir = log_dir or os.getcwd() |
| log_dir = os.path.abspath(log_dir) |
| if total_runs > 1: |
| log_prefix = "%s_%d_%d" % (log_prefix, current_run, total_runs) |
| if timestamp: |
| now = datetime.datetime.now() |
| log_prefix = "%s_%s" % (log_prefix, now.strftime('%Y%m%d%H%M%S')) |
| return os.path.join(log_dir, log_prefix + '.csv') |
| |
| |
| def RunIPG(duration_in_s=60, resolution_in_ms=100, logfile=None): |
| intel_power_gadget_path = LocateIPG() |
| command = ('"%s" -duration %d -resolution %d' % |
| (intel_power_gadget_path, duration_in_s, resolution_in_ms)) |
| if not logfile: |
| # It is not necessary but allows to print out the log path for debugging. |
| logfile = GenerateIPGLogFilename() |
| command = command + (' -file %s' % logfile) |
| logging.debug("Running: " + command) |
| try: |
| output = subprocess.check_output(command, |
| shell=True, |
| stderr=subprocess.STDOUT) |
| except subprocess.CalledProcessError as e: |
| logging.error('Running Intel Power Gadget failed. Output: %s', e.output) |
| raise |
| logging.debug("Running: DONE") |
| logging.debug(output) |
| |
| |
| def AnalyzeIPGLogFile(logfile=None, skip_in_sec=0): |
| if not logfile: |
| logfile = GenerateIPGLogFilename() |
| if not os.path.isfile(logfile): |
| raise Exception("Can't locate logfile at " + logfile) |
| first_line = True |
| samples = 0 |
| cols = 0 |
| indices = [] |
| labels = [] |
| sums = [] |
| col_time = None |
| for line in open(logfile): |
| tokens = [token.strip('" ') for token in line.split(',')] |
| if first_line: |
| first_line = False |
| cols = len(tokens) |
| for ii in range(0, cols): |
| token = tokens[ii] |
| if token.startswith('Elapsed Time'): |
| col_time = ii |
| elif token.endswith('(Watt)'): |
| indices.append(ii) |
| labels.append(token[:-len('(Watt)')]) |
| sums.append(0.0) |
| assert col_time |
| assert cols > 0 |
| assert len(indices) > 0 |
| continue |
| if len(tokens) != cols: |
| continue |
| if skip_in_sec > 0 and float(tokens[col_time]) < skip_in_sec: |
| continue |
| samples += 1 |
| for ii in range(0, len(indices)): |
| index = indices[ii] |
| sums[ii] += float(tokens[index]) |
| results = {'samples': samples} |
| if samples > 0: |
| for ii in range(0, len(indices)): |
| results[labels[ii]] = sums[ii] / samples |
| return results |
| |
| |
| def ProcessResultsFromMultipleIPGRuns(logfiles, |
| skip_in_seconds=0, |
| outliers=0, |
| output_json=None): |
| def _ScrapeDataFromIPGLogFiles(): |
| """Scrapes data from IPG log files. |
| |
| Returns: |
| A tuple (per_core_results, metrics). |output| is a dictionary containing |
| per-core results extracted from the IPG log files. |metrics| is a |
| dictionary mapping metrics found in the logs to all found data points. |
| """ |
| per_core_results = {} |
| metrics = {} |
| for logfile in logfiles: |
| results = AnalyzeIPGLogFile(logfile, skip_in_seconds) |
| results['log'] = logfile |
| (_, filename) = os.path.split(logfile) |
| (core, _) = os.path.splitext(filename) |
| prefix = 'PowerLog_' |
| if core.startswith(prefix): |
| core = core[len(prefix):] |
| per_core_results[core] = results |
| |
| for key in results: |
| if key == 'samples' or key == 'log': |
| continue |
| metrics.setdefault(key, []).append(results[key]) |
| return per_core_results, metrics |
| |
| def _CalculateSummaryStatistics(metrics): |
| """Calculates summary statistics for the given metrics. |
| |
| Args: |
| metrics: A dictionary mapping metrics to lists of data points. |
| |
| Returns: |
| A dictionary mapping the same metrics in |metrics| to dicts containing |
| the 'mean' and 'stdev' for the metric. |
| """ |
| summary = {} |
| for key, data in metrics.iteritems(): |
| assert data and len(data) > 1 |
| n = len(data) |
| if outliers > 0: |
| assert outliers * 2 < n |
| data.sort() |
| data = data[outliers:(n - outliers)] |
| n = len(data) |
| logging.debug('%s: valid samples = %d', key, n) |
| mean = sum(data) / float(n) |
| ss = sum((x - mean)**2 for x in data) |
| stdev = (ss / float(n))**0.5 |
| summary[key] = { |
| 'mean': mean, |
| 'stdev': stdev, |
| } |
| return summary |
| |
| assert len(logfiles) > 1 |
| output, metrics = _ScrapeDataFromIPGLogFiles() |
| summary = _CalculateSummaryStatistics(metrics) |
| output['summary'] = summary |
| |
| if output_json: |
| json_file = open(output_json, 'w') |
| json_file.write(json.dumps(output, indent=4)) |
| json_file.close() |
| |
| return summary |
