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16e03e7968
PR-URL: https://github.com/nodejs/node/pull/45579 Reviewed-By: Michaël Zasso <targos@protonmail.com> Reviewed-By: James M Snell <jasnell@gmail.com>
96 lines
2.6 KiB
Python
Executable File
96 lines
2.6 KiB
Python
Executable File
#!/usr/bin/env python3
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# Copyright 2022 the V8 project authors. All rights reserved.
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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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import subprocess
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import sys
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import time
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kDefaultSamplerateSecs = 0.001
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def PrintHelp(returncode):
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print(f"""Usage: {sys.argv[0]} [--interval I] [--freq F] [--] COMMAND
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Runs COMMAND, and samples its RSS memory usage every I milliseconds (or F \
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times per second).
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Default sample interval is {kDefaultSamplerateSecs * 1000} ms.
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'--' as argument forces all further arguments to be part of COMMAND.
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""")
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sys.exit(returncode)
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def Main():
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# Parse arguments.
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args = []
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samplerate_secs = kDefaultSamplerateSecs
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idx = 1
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while idx < len(sys.argv):
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arg = sys.argv[idx]
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if arg == "--":
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args += sys.argv[(idx + 1):]
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break
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if arg in ("-h", "--help", "help"):
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PrintHelp(0)
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elif arg in ("--interval", "-I"):
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if idx + 1 >= len(sys.argv):
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PrintHelp(1)
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samplerate_secs = int(sys.argv[idx + 1]) / 1000
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idx += 1 # Skip the value.
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elif arg in ("--freq", "-F"):
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if idx + 1 >= len(sys.argv):
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PrintHelp(1)
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samplerate_secs = 1 / float(sys.argv[idx + 1])
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idx += 1 # Skip the value.
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else:
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# No match for known parameter; assume it's part of the command to run.
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args.append(arg)
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idx += 1 # Go to next arg.
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cmd = " ".join(args)
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print(f"sample rate: {samplerate_secs}")
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print(f"command: {cmd}")
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# Run the child process and observe it.
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process = subprocess.Popen(cmd, shell=True)
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pid = process.pid
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print(f"pid: {pid}")
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statusfile = f"/proc/{pid}/status"
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vmsum = 0
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observed_max = 0
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reported_max = 0
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sample_count = 0
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while process.poll() is None:
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with open(statusfile, 'r') as f:
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for line in f.read().splitlines():
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if line.startswith("VmRSS"):
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rss = int(line.split()[1])
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vmsum += rss
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if rss > observed_max:
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observed_max = rss
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elif line.startswith("VmHWM"):
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peak = int(line.split()[1])
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if peak > reported_max:
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reported_max = peak
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sample_count += 1
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time.sleep(samplerate_secs)
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# Report findings.
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print("\n")
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# TODO(jkummerow): See if this is accurate enough in practice.
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walltime = sample_count * samplerate_secs
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print(f"wall time: {walltime:.3f} s") # Sample rate precision!
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print("")
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avg = vmsum / sample_count / 1024
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reported_max /= 1024
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observed_max /= 1024
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print(f"average RSS: {avg:.2f} MB")
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print(f"reported max: {reported_max:.2f} MB")
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print(f"observed max: {observed_max:.2f} MB")
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sys.exit(process.returncode)
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if __name__ == "__main__":
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Main()
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