dfd8808526
The methodology used to generate this CL is documented in https://crbug.com/1098010#c95. No-Try: true No-Presubmit: true Bug: 1098010 Change-Id: I3a8a7b150e7bd64690534727150646081df50439 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3900697 Reviewed-by: Mark Mentovai <mark@chromium.org> Auto-Submit: Avi Drissman <avi@chromium.org> Owners-Override: Avi Drissman <avi@chromium.org> Commit-Queue: Avi Drissman <avi@chromium.org> Cr-Commit-Position: refs/heads/main@{#1047644}
94 lines
3.0 KiB
Python
Executable File
94 lines
3.0 KiB
Python
Executable File
#!/usr/bin/env vpython3
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# Copyright 2021 The Chromium Authors
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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"""
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This script checks to see what build commands are currently running by printing
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the command lines of any processes that are the children of ninja processes.
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The idea is that if the build is serialized (not many build steps running) then
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you can run this to see what it is serialized on.
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This uses python3 on Windows and vpython elsewhere (for psutil).
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"""
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import sys
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def main():
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parents = []
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processes = []
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print('Gathering process data...')
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# Ninja's name on Linux is ninja-linux64, presumably different elsewhere, so
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# we look for a matching prefix.
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ninja_prefix = 'ninja.exe' if sys.platform in ['win32', 'cygwin'] else 'ninja'
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if sys.platform in ['win32', 'cygwin']:
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# psutil handles short-lived ninja descendants poorly on Windows (it misses
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# most of them) so use wmic instead.
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import subprocess
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cmd = 'wmic process get Caption,ParentProcessId,ProcessId,CommandLine'
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lines = subprocess.check_output(cmd, universal_newlines=True).splitlines()
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# Find the offsets for the various data columns by looking at the labels in
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# the first line of output.
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CAPTION_OFF = 0
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COMMAND_LINE_OFF = lines[0].find('CommandLine')
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PARENT_PID_OFF = lines[0].find('ParentProcessId')
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PID_OFF = lines[0].find(' ProcessId') + 1
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for line in lines[1:]:
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# Ignore blank lines
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if not line.strip():
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continue
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command = line[:COMMAND_LINE_OFF].strip()
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command_line = line[COMMAND_LINE_OFF:PARENT_PID_OFF].strip()
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parent_pid = int(line[PARENT_PID_OFF:PID_OFF].strip())
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pid = int(line[PID_OFF:].strip())
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processes.append((command, command_line, parent_pid, pid))
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else:
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# Portable process-collection code, but works badly on Windows.
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import psutil
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for proc in psutil.process_iter(['pid', 'ppid', 'name', 'cmdline']):
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try:
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cmdline = proc.cmdline()
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# Convert from list to a single string.
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cmdline = ' '.join(cmdline)
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except psutil.AccessDenied:
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cmdline = "Access denied"
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processes.append(
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(proc.name()[:], cmdline, int(proc.ppid()), int(proc.pid)))
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# Scan the list of processes to find ninja.
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for process in processes:
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command, command_line, parent_pid, pid = process
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if command.startswith(ninja_prefix):
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parents.append(pid)
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if not parents:
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print('No interesting parent processes found.')
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return 1
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print('Tracking the children of these PIDs:')
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print(', '.join(map(lambda x: str(x), parents)))
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print()
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# Print all the processes that have parent-processes of interest.
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count = 0
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for process in processes:
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command, command_line, parent_pid, pid = process
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if parent_pid in parents:
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if not command_line:
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command_line = command
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print('%5d: %s' % (pid, command_line[:160]))
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count += 1
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print('Found %d children' % count)
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return 0
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if __name__ == '__main__':
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main()
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