callstats.py 22.8 KB
Newer Older
1 2 3 4 5
#!/usr/bin/env python
# Copyright 2016 the V8 project authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
'''
6
Usage: callstats.py [-h] <command> ...
7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27

Optional arguments:
  -h, --help  show this help message and exit

Commands:
  run         run chrome with --runtime-call-stats and generate logs
  stats       process logs and print statistics
  json        process logs from several versions and generate JSON
  help        help information

For each command, you can try ./runtime-call-stats.py help command.
'''

import argparse
import json
import os
import re
import shutil
import subprocess
import sys
import tempfile
28
import operator
29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48

import numpy
import scipy
import scipy.stats
from math import sqrt


# Run benchmarks.

def print_command(cmd_args):
  def fix_for_printing(arg):
    m = re.match(r'^--([^=]+)=(.*)$', arg)
    if m and (' ' in m.group(2) or m.group(2).startswith('-')):
      arg = "--{}='{}'".format(m.group(1), m.group(2))
    elif ' ' in arg:
      arg = "'{}'".format(arg)
    return arg
  print " ".join(map(fix_for_printing, cmd_args))


49 50 51 52
def start_replay_server(args, sites):
  with tempfile.NamedTemporaryFile(prefix='callstats-inject-', suffix='.js',
                                   mode='wt', delete=False) as f:
    injection = f.name
53
    generate_injection(f, sites, args.refresh)
54 55
  http_port = 4080 + args.port_offset
  https_port = 4443 + args.port_offset
56 57
  cmd_args = [
      args.replay_bin,
58 59
      "--port=%s" % http_port,
      "--ssl_port=%s" % https_port,
60 61 62
      "--no-dns_forwarding",
      "--use_closest_match",
      "--no-diff_unknown_requests",
63
      "--inject_scripts=deterministic.js,{}".format(injection),
64 65 66 67 68 69 70 71
      args.replay_wpr,
  ]
  print "=" * 80
  print_command(cmd_args)
  with open(os.devnull, 'w') as null:
    server = subprocess.Popen(cmd_args, stdout=null, stderr=null)
  print "RUNNING REPLAY SERVER: %s with PID=%s" % (args.replay_bin, server.pid)
  print "=" * 80
72
  return {'process': server, 'injection': injection}
73 74 75


def stop_replay_server(server):
76 77 78 79 80
  print("SHUTTING DOWN REPLAY SERVER %s" % server['process'].pid)
  server['process'].terminate()
  os.remove(server['injection'])


81
def generate_injection(f, sites, refreshes=0):
82 83
  print >> f, """\
(function() {
84 85 86 87
  var s = window.sessionStorage.getItem("refreshCounter");
  var refreshTotal = """, refreshes, """;
  var refreshCounter = s ? parseInt(s) : refreshTotal;
  var refreshId = refreshTotal - refreshCounter;
88 89 90
  if (refreshCounter > 0) {
    window.sessionStorage.setItem("refreshCounter", refreshCounter-1);
  }
91
  function match(url, item) {
92 93 94
    if ('regexp' in item) { return url.match(item.regexp) !== null };
    var url_wanted = item.url;
    /* Allow automatic redirections from http to https. */
95 96 97 98 99
    if (url_wanted.startsWith("http://") && url.startsWith("https://")) {
      url_wanted = "https://" + url_wanted.substr(7);
    }
    return url.startsWith(url_wanted);
  };
100 101
  function onLoad(url) {
    for (var item of sites) {
102
      if (!match(url, item)) continue;
103
      var timeout = 'timeline' in item ? 2000 * item.timeline
104 105 106
                  : 'timeout'  in item ? 1000 * (item.timeout - 3)
                  : 10000;
      console.log("Setting time out of " + timeout + " for: " + url);
107
      window.setTimeout(function() {
108
        console.log("Time is out for: " + url);
109
        var msg = "STATS: (" + refreshId + ") " + url;
110 111
        %GetAndResetRuntimeCallStats(1, msg);
        if (refreshCounter > 0) {
112 113
          console.log(
              "Refresh counter is " + refreshCounter + ", refreshing: " + url);
114 115
          window.location.reload();
        }
116 117 118 119 120
      }, timeout);
      return;
    }
    console.log("Ignoring: " + url);
  };
121
  var sites =
122
    """, json.dumps(sites), """;
123
  onLoad(window.location.href);
124
})();"""
125 126 127 128 129 130 131 132


def run_site(site, domain, args, timeout=None):
  print "="*80
  print "RUNNING DOMAIN %s" % domain
  print "="*80
  result_template = "{domain}#{count}.txt" if args.repeat else "{domain}.txt"
  count = 0
133
  if timeout is None: timeout = args.timeout
134 135 136
  if args.replay_wpr:
    timeout *= 1 + args.refresh
    timeout += 1
137
  retries_since_good_run = 0
138 139 140 141 142 143 144
  while count == 0 or args.repeat is not None and count < args.repeat:
    count += 1
    result = result_template.format(domain=domain, count=count)
    retries = 0
    while args.retries is None or retries < args.retries:
      retries += 1
      try:
145 146 147
        if args.user_data_dir:
          user_data_dir = args.user_data_dir
        else:
148 149
          user_data_dir = tempfile.mkdtemp(prefix="chr_")
        js_flags = "--runtime-call-stats"
150
        if args.replay_wpr: js_flags += " --allow-natives-syntax"
151 152 153
        if args.js_flags: js_flags += " " + args.js_flags
        chrome_flags = [
            "--no-default-browser-check",
154
            "--no-sandbox",
155 156 157 158 159 160
            "--disable-translate",
            "--js-flags={}".format(js_flags),
            "--no-first-run",
            "--user-data-dir={}".format(user_data_dir),
        ]
        if args.replay_wpr:
161 162
          http_port = 4080 + args.port_offset
          https_port = 4443 + args.port_offset
163
          chrome_flags += [
164 165 166 167
              "--host-resolver-rules=MAP *:80 localhost:%s, "  \
                                    "MAP *:443 localhost:%s, " \
                                    "EXCLUDE localhost" % (
                                        http_port, https_port),
168
              "--ignore-certificate-errors",
169
              "--disable-seccomp-sandbox",
170 171 172 173
              "--disable-web-security",
              "--reduce-security-for-testing",
              "--allow-insecure-localhost",
          ]
174 175
        else:
          chrome_flags += [
176
              "--single-process",
177
          ]
178 179 180 181 182 183 184 185 186 187
        if args.chrome_flags:
          chrome_flags += args.chrome_flags.split()
        cmd_args = [
            "timeout", str(timeout),
            args.with_chrome
        ] + chrome_flags + [ site ]
        print "- " * 40
        print_command(cmd_args)
        print "- " * 40
        with open(result, "wt") as f:
188 189
          with open(args.log_stderr or os.devnull, 'at') as err:
            status = subprocess.call(cmd_args, stdout=f, stderr=err)
190 191 192 193 194 195 196 197 198 199 200 201
        # 124 means timeout killed chrome, 0 means the user was bored first!
        # If none of these two happened, then chrome apparently crashed, so
        # it must be called again.
        if status != 124 and status != 0:
          print("CHROME CRASHED, REPEATING RUN");
          continue
        # If the stats file is empty, chrome must be called again.
        if os.path.isfile(result) and os.path.getsize(result) > 0:
          if args.print_url:
            with open(result, "at") as f:
              print >> f
              print >> f, "URL: {}".format(site)
202
          retries_since_good_run = 0
203
          break
204 205 206 207 208
        if retries_since_good_run < 6:
          timeout += 2 ** retries_since_good_run
          retries_since_good_run += 1
        print("EMPTY RESULT, REPEATING RUN ({})".format(
            retries_since_good_run));
209
      finally:
210
        if not args.user_data_dir:
211 212 213 214 215 216 217 218 219 220 221
          shutil.rmtree(user_data_dir)


def read_sites_file(args):
  try:
    sites = []
    try:
      with open(args.sites_file, "rt") as f:
        for item in json.load(f):
          if 'timeout' not in item:
            # This is more-or-less arbitrary.
222
            item['timeout'] = int(1.5 * item['timeline'] + 7)
223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241
          if item['timeout'] > args.timeout: item['timeout'] = args.timeout
          sites.append(item)
    except ValueError:
      with open(args.sites_file, "rt") as f:
        for line in f:
          line = line.strip()
          if not line or line.startswith('#'): continue
          sites.append({'url': line, 'timeout': args.timeout})
    return sites
  except IOError as e:
    args.error("Cannot read from {}. {}.".format(args.sites_file, e.strerror))
    sys.exit(1)


def do_run(args):
  # Determine the websites to benchmark.
  if args.sites_file:
    sites = read_sites_file(args)
  else:
242
    sites = [{'url': site, 'timeout': args.timeout} for site in args.sites]
243 244 245 246 247
  # Disambiguate domains, if needed.
  L = []
  domains = {}
  for item in sites:
    site = item['url']
248 249 250 251 252 253 254 255 256 257 258
    domain = None
    if args.domain:
      domain = args.domain
    elif 'domain' in item:
      domain = item['domain']
    else:
      m = re.match(r'^(https?://)?([^/]+)(/.*)?$', site)
      if not m:
        args.error("Invalid URL {}.".format(site))
        continue
      domain = m.group(2)
259 260 261 262 263 264 265 266 267 268
    entry = [site, domain, None, item['timeout']]
    if domain not in domains:
      domains[domain] = entry
    else:
      if not isinstance(domains[domain], int):
        domains[domain][2] = 1
        domains[domain] = 1
      domains[domain] += 1
      entry[2] = domains[domain]
    L.append(entry)
269
  replay_server = start_replay_server(args, sites) if args.replay_wpr else None
270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312
  try:
    # Run them.
    for site, domain, count, timeout in L:
      if count is not None: domain = "{}%{}".format(domain, count)
      print site, domain, timeout
      run_site(site, domain, args, timeout)
  finally:
    if replay_server:
      stop_replay_server(replay_server)


# Calculate statistics.

def statistics(data):
  N = len(data)
  average = numpy.average(data)
  median = numpy.median(data)
  low = numpy.min(data)
  high= numpy.max(data)
  if N > 1:
    # evaluate sample variance by setting delta degrees of freedom (ddof) to
    # 1. The degree used in calculations is N - ddof
    stddev = numpy.std(data, ddof=1)
    # Get the endpoints of the range that contains 95% of the distribution
    t_bounds = scipy.stats.t.interval(0.95, N-1)
    #assert abs(t_bounds[0] + t_bounds[1]) < 1e-6
    # sum mean to the confidence interval
    ci = {
        'abs': t_bounds[1] * stddev / sqrt(N),
        'low': average + t_bounds[0] * stddev / sqrt(N),
        'high': average + t_bounds[1] * stddev / sqrt(N)
    }
  else:
    stddev = 0
    ci = { 'abs': 0, 'low': average, 'high': average }
  if abs(stddev) > 0.0001 and abs(average) > 0.0001:
    ci['perc'] = t_bounds[1] * stddev / sqrt(N) / average * 100
  else:
    ci['perc'] = 0
  return { 'samples': N, 'average': average, 'median': median,
           'stddev': stddev, 'min': low, 'max': high, 'ci': ci }


313 314 315 316 317 318 319
def read_stats(path, domain, args):
  groups = [];
  if args.aggregate:
    groups = [
        ('Group-IC', re.compile(".*IC.*")),
        ('Group-Optimize',
         re.compile("StackGuard|.*Optimize.*|.*Deoptimize.*|Recompile.*")),
320 321 322 323
        ('Group-Compile', re.compile(".*Compile.*")),
        ('Group-Parse', re.compile(".*Parse.*")),
        ('Group-Callback', re.compile(".*Callback.*")),
        ('Group-API', re.compile(".*API.*")),
324 325 326
        ('Group-GC', re.compile("GC|AllocateInTargetSpace")),
        ('Group-JavaScript', re.compile("JS_Execution")),
        ('Group-Runtime', re.compile(".*"))]
327 328
  with open(path, "rt") as f:
    # Process the whole file and sum repeating entries.
329 330 331
    entries = { 'Sum': {'time': 0, 'count': 0} }
    for group_name, regexp in groups:
      entries[group_name] = { 'time': 0, 'count': 0 }
332 333 334 335 336 337 338 339
    for line in f:
      line = line.strip()
      # Discard headers and footers.
      if not line: continue
      if line.startswith("Runtime Function"): continue
      if line.startswith("===="): continue
      if line.startswith("----"): continue
      if line.startswith("URL:"): continue
340
      if line.startswith("STATS:"): continue
341 342 343 344 345
      # We have a regular line.
      fields = line.split()
      key = fields[0]
      time = float(fields[1].replace("ms", ""))
      count = int(fields[3])
346 347 348
      if key not in entries: entries[key] = { 'time': 0, 'count': 0 }
      entries[key]['time'] += time
      entries[key]['count'] += count
349 350
      # We calculate the sum, if it's not the "total" line.
      if key != "Total":
351 352 353 354 355 356 357 358 359 360 361 362
        entries['Sum']['time'] += time
        entries['Sum']['count'] += count
        for group_name, regexp in groups:
          if not regexp.match(key): continue
          entries[group_name]['time'] += time
          entries[group_name]['count'] += count
          break
    # Append the sums as single entries to domain.
    for key in entries :
      if key not in domain: domain[key] = { 'time_list': [], 'count_list': [] }
      domain[key]['time_list'].append(entries[key]['time'])
      domain[key]['count_list'].append(entries[key]['count'])
363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400


def print_stats(S, args):
  # Sort by ascending/descending time average, then by ascending/descending
  # count average, then by ascending name.
  def sort_asc_func(item):
    return (item[1]['time_stat']['average'],
            item[1]['count_stat']['average'],
            item[0])
  def sort_desc_func(item):
    return (-item[1]['time_stat']['average'],
            -item[1]['count_stat']['average'],
            item[0])
  # Sorting order is in the commend-line arguments.
  sort_func = sort_asc_func if args.sort == "asc" else sort_desc_func
  # Possibly limit how many elements to print.
  L = [item for item in sorted(S.items(), key=sort_func)
       if item[0] not in ["Total", "Sum"]]
  N = len(L)
  if args.limit == 0:
    low, high = 0, N
  elif args.sort == "desc":
    low, high = 0, args.limit
  else:
    low, high = N-args.limit, N
  # How to print entries.
  def print_entry(key, value):
    def stats(s, units=""):
      conf = "{:0.1f}({:0.2f}%)".format(s['ci']['abs'], s['ci']['perc'])
      return "{:8.1f}{} +/- {:15s}".format(s['average'], units, conf)
    print "{:>50s}  {}  {}".format(
      key,
      stats(value['time_stat'], units="ms"),
      stats(value['count_stat'])
    )
  # Print and calculate partial sums, if necessary.
  for i in range(low, high):
    print_entry(*L[i])
401
    if args.totals and args.limit != 0 and not args.aggregate:
402 403 404 405 406 407 408 409 410 411 412 413
      if i == low:
        partial = { 'time_list': [0] * len(L[i][1]['time_list']),
                    'count_list': [0] * len(L[i][1]['count_list']) }
      assert len(partial['time_list']) == len(L[i][1]['time_list'])
      assert len(partial['count_list']) == len(L[i][1]['count_list'])
      for j, v in enumerate(L[i][1]['time_list']):
        partial['time_list'][j] += v
      for j, v in enumerate(L[i][1]['count_list']):
        partial['count_list'][j] += v
  # Print totals, if necessary.
  if args.totals:
    print '-' * 80
414
    if args.limit != 0 and not args.aggregate:
415 416 417 418 419 420 421 422
      partial['time_stat'] = statistics(partial['time_list'])
      partial['count_stat'] = statistics(partial['count_list'])
      print_entry("Partial", partial)
    print_entry("Sum", S["Sum"])
    print_entry("Total", S["Total"])


def do_stats(args):
423
  domains = {}
424 425 426 427
  for path in args.logfiles:
    filename = os.path.basename(path)
    m = re.match(r'^([^#]+)(#.*)?$', filename)
    domain = m.group(1)
428 429 430 431 432 433
    if domain not in domains: domains[domain] = {}
    read_stats(path, domains[domain], args)
  if args.aggregate:
    create_total_page_stats(domains, args)
  for i, domain in enumerate(sorted(domains)):
    if len(domains) > 1:
434 435 436
      if i > 0: print
      print "{}:".format(domain)
      print '=' * 80
437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467
    domain_stats = domains[domain]
    for key in domain_stats:
      domain_stats[key]['time_stat'] = \
          statistics(domain_stats[key]['time_list'])
      domain_stats[key]['count_stat'] = \
          statistics(domain_stats[key]['count_list'])
    print_stats(domain_stats, args)


# Create a Total page with all entries summed up.
def create_total_page_stats(domains, args):
  total = {}
  def sum_up(parent, key, other):
    sums = parent[key]
    for i, item in enumerate(other[key]):
      if i >= len(sums):
        sums.extend([0] * (i - len(sums) + 1))
      if item is not None:
        sums[i] += item
  # Sum up all the entries/metrics from all domains
  for domain, entries in domains.items():
    for key, domain_stats in entries.items():
      if key not in total:
        total[key] = {}
        total[key]['time_list'] = list(domain_stats['time_list'])
        total[key]['count_list'] = list(domain_stats['count_list'])
      else:
        sum_up(total[key], 'time_list', domain_stats)
        sum_up(total[key], 'count_list', domain_stats)
  # Add a new "Total" page containing the summed up metrics.
  domains['Total'] = total
468 469 470 471 472


# Generate JSON file.

def do_json(args):
473
  versions = {}
474 475 476 477
  for path in args.logdirs:
    if os.path.isdir(path):
      for root, dirs, files in os.walk(path):
        version = os.path.basename(root)
478
        if version not in versions: versions[version] = {}
479 480
        for filename in files:
          if filename.endswith(".txt"):
481
            m = re.match(r'^([^#]+)(#.*)?\.txt$', filename)
482
            domain = m.group(1)
483 484 485 486 487 488 489 490 491
            if domain not in versions[version]: versions[version][domain] = {}
            read_stats(os.path.join(root, filename),
                       versions[version][domain], args)
  for version, domains in versions.items():
    if args.aggregate:
      create_total_page_stats(domains, args)
    for domain, entries in domains.items():
      stats = []
      for name, value in entries.items():
492 493 494 495
        # We don't want the calculated sum in the JSON file.
        if name == "Sum": continue
        entry = [name]
        for x in ['time_list', 'count_list']:
496
          s = statistics(entries[name][x])
497 498 499
          entry.append(round(s['average'], 1))
          entry.append(round(s['ci']['abs'], 1))
          entry.append(round(s['ci']['perc'], 2))
500 501 502
        stats.append(entry)
      domains[domain] = stats
  print json.dumps(versions, separators=(',', ':'))
503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518


# Help.

def do_help(parser, subparsers, args):
  if args.help_cmd:
    if args.help_cmd in subparsers:
      subparsers[args.help_cmd].print_help()
    else:
      args.error("Unknown command '{}'".format(args.help_cmd))
  else:
    parser.print_help()


# Main program, parse command line and execute.

519 520 521 522
def coexist(*l):
  given = sum(1 for x in l if x)
  return given == 0 or given == len(l)

523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538
def main():
  parser = argparse.ArgumentParser()
  subparser_adder = parser.add_subparsers(title="commands", dest="command",
                                          metavar="<command>")
  subparsers = {}
  # Command: run.
  subparsers["run"] = subparser_adder.add_parser(
      "run", help="run --help")
  subparsers["run"].set_defaults(
      func=do_run, error=subparsers["run"].error)
  subparsers["run"].add_argument(
      "--chrome-flags", type=str, default="",
      help="specify additional chrome flags")
  subparsers["run"].add_argument(
      "--js-flags", type=str, default="",
      help="specify additional V8 flags")
539 540 541
  subparsers["run"].add_argument(
      "--domain", type=str, default="",
      help="specify the output file domain name")
542 543 544 545 546 547
  subparsers["run"].add_argument(
      "--no-url", dest="print_url", action="store_false", default=True,
      help="do not include url in statistics file")
  subparsers["run"].add_argument(
      "-n", "--repeat", type=int, metavar="<num>",
      help="specify iterations for each website (default: once)")
548 549 550
  subparsers["run"].add_argument(
      "-k", "--refresh", type=int, metavar="<num>", default=0,
      help="specify refreshes for each iteration (default: 0)")
551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566
  subparsers["run"].add_argument(
      "--replay-wpr", type=str, metavar="<path>",
      help="use the specified web page replay (.wpr) archive")
  subparsers["run"].add_argument(
      "--replay-bin", type=str, metavar="<path>",
      help="specify the replay.py script typically located in " \
           "$CHROMIUM/src/third_party/webpagereplay/replay.py")
  subparsers["run"].add_argument(
      "-r", "--retries", type=int, metavar="<num>",
      help="specify retries if website is down (default: forever)")
  subparsers["run"].add_argument(
      "-f", "--sites-file", type=str, metavar="<path>",
      help="specify file containing benchmark websites")
  subparsers["run"].add_argument(
      "-t", "--timeout", type=int, metavar="<seconds>", default=60,
      help="specify seconds before chrome is killed")
567 568 569
  subparsers["run"].add_argument(
      "-p", "--port-offset", type=int, metavar="<offset>", default=0,
      help="specify the offset for the replay server's default ports")
570 571 572 573 574 575 576
  subparsers["run"].add_argument(
      "-u", "--user-data-dir", type=str, metavar="<path>",
      help="specify user data dir (default is temporary)")
  subparsers["run"].add_argument(
      "-c", "--with-chrome", type=str, metavar="<path>",
      default="/usr/bin/google-chrome",
      help="specify chrome executable to use")
577 578 579
  subparsers["run"].add_argument(
      "-l", "--log-stderr", type=str, metavar="<path>",
      help="specify where chrome's stderr should go (default: /dev/null)")
580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599
  subparsers["run"].add_argument(
      "sites", type=str, metavar="<URL>", nargs="*",
      help="specify benchmark website")
  # Command: stats.
  subparsers["stats"] = subparser_adder.add_parser(
      "stats", help="stats --help")
  subparsers["stats"].set_defaults(
      func=do_stats, error=subparsers["stats"].error)
  subparsers["stats"].add_argument(
      "-l", "--limit", type=int, metavar="<num>", default=0,
      help="limit how many items to print (default: none)")
  subparsers["stats"].add_argument(
      "-s", "--sort", choices=["asc", "desc"], default="asc",
      help="specify sorting order (default: ascending)")
  subparsers["stats"].add_argument(
      "-n", "--no-total", dest="totals", action="store_false", default=True,
      help="do not print totals")
  subparsers["stats"].add_argument(
      "logfiles", type=str, metavar="<logfile>", nargs="*",
      help="specify log files to parse")
600 601 602 603
  subparsers["stats"].add_argument(
      "--aggregate", dest="aggregate", action="store_true", default=False,
      help="Create aggregated entries. Adds Group-* entries at the toplevel. " +
      "Additionally creates a Total page with all entries.")
604 605 606 607 608 609 610 611
  # Command: json.
  subparsers["json"] = subparser_adder.add_parser(
      "json", help="json --help")
  subparsers["json"].set_defaults(
      func=do_json, error=subparsers["json"].error)
  subparsers["json"].add_argument(
      "logdirs", type=str, metavar="<logdir>", nargs="*",
      help="specify directories with log files to parse")
612 613 614 615
  subparsers["json"].add_argument(
      "--aggregate", dest="aggregate", action="store_true", default=False,
      help="Create aggregated entries. Adds Group-* entries at the toplevel. " +
      "Additionally creates a Total page with all entries.")
616 617 618 619 620 621 622 623 624 625 626
  # Command: help.
  subparsers["help"] = subparser_adder.add_parser(
      "help", help="help information")
  subparsers["help"].set_defaults(
      func=lambda args: do_help(parser, subparsers, args),
      error=subparsers["help"].error)
  subparsers["help"].add_argument(
      "help_cmd", type=str, metavar="<command>", nargs="?",
      help="command for which to display help")
  # Execute the command.
  args = parser.parse_args()
627 628 629
  setattr(args, 'script_path', os.path.dirname(sys.argv[0]))
  if args.command == "run" and coexist(args.sites_file, args.sites):
    args.error("use either option --sites-file or site URLs")
630
    sys.exit(1)
631 632
  elif args.command == "run" and not coexist(args.replay_wpr, args.replay_bin):
    args.error("options --replay-wpr and --replay-bin must be used together")
633 634 635 636 637 638
    sys.exit(1)
  else:
    args.func(args)

if __name__ == "__main__":
  sys.exit(main())