| #!/usr/bin/env vpython3 |
| # Copyright 2021 The Chromium Authors |
| # Use of this source code is governed by a BSD-style license that can be |
| # found in the LICENSE file. |
| """ |
| This script checks to see what build commands are currently running by printing |
| the command lines of any processes that are the children of ninja processes. |
| |
| The idea is that if the build is serialized (not many build steps running) then |
| you can run this to see what it is serialized on. |
| |
| This uses python3 on Windows and vpython elsewhere (for psutil). |
| """ |
| |
| import sys |
| |
| |
| def main(): |
| parents = [] |
| processes = [] |
| |
| print('Gathering process data...') |
| # Ninja's name on Linux is ninja-linux64, presumably different elsewhere, so |
| # we look for a matching prefix. |
| ninja_prefix = 'ninja.exe' if sys.platform in ['win32', 'cygwin'] else 'ninja' |
| |
| if sys.platform in ['win32', 'cygwin']: |
| # psutil handles short-lived ninja descendants poorly on Windows (it misses |
| # most of them) so use wmic instead. |
| import subprocess |
| cmd = 'wmic process get Caption,ParentProcessId,ProcessId,CommandLine' |
| lines = subprocess.check_output(cmd, universal_newlines=True).splitlines() |
| |
| # Find the offsets for the various data columns by looking at the labels in |
| # the first line of output. |
| CAPTION_OFF = 0 |
| COMMAND_LINE_OFF = lines[0].find('CommandLine') |
| PARENT_PID_OFF = lines[0].find('ParentProcessId') |
| PID_OFF = lines[0].find(' ProcessId') + 1 |
| |
| for line in lines[1:]: |
| # Ignore blank lines |
| if not line.strip(): |
| continue |
| command = line[:COMMAND_LINE_OFF].strip() |
| command_line = line[COMMAND_LINE_OFF:PARENT_PID_OFF].strip() |
| parent_pid = int(line[PARENT_PID_OFF:PID_OFF].strip()) |
| pid = int(line[PID_OFF:].strip()) |
| processes.append((command, command_line, parent_pid, pid)) |
| |
| else: |
| # Portable process-collection code, but works badly on Windows. |
| import psutil |
| for proc in psutil.process_iter(['pid', 'ppid', 'name', 'cmdline']): |
| try: |
| cmdline = proc.cmdline() |
| # Convert from list to a single string. |
| cmdline = ' '.join(cmdline) |
| except psutil.AccessDenied: |
| cmdline = "Access denied" |
| processes.append( |
| (proc.name()[:], cmdline, int(proc.ppid()), int(proc.pid))) |
| |
| # Scan the list of processes to find ninja. |
| for process in processes: |
| command, command_line, parent_pid, pid = process |
| if command.startswith(ninja_prefix): |
| parents.append(pid) |
| |
| if not parents: |
| print('No interesting parent processes found.') |
| return 1 |
| |
| print('Tracking the children of these PIDs:') |
| print(', '.join(map(lambda x: str(x), parents))) |
| |
| print() |
| |
| # Print all the processes that have parent-processes of interest. |
| count = 0 |
| for process in processes: |
| command, command_line, parent_pid, pid = process |
| if parent_pid in parents: |
| if not command_line: |
| command_line = command |
| print('%5d: %s' % (pid, command_line[:160])) |
| count += 1 |
| print('Found %d children' % count) |
| return 0 |
| |
| |
| if __name__ == '__main__': |
| main() |