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[GR-50424] Add custom rss percentile tracker, based on the ps command.
PullRequest: mx/1725
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| Original file line number | Diff line number | Diff line change |
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| # ---------------------------------------------------------------------------------------------------- | ||
| # | ||
| # Copyright (c) 2023, Oracle and/or its affiliates. All rights reserved. | ||
| # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| # | ||
| # This code is free software; you can redistribute it and/or modify it | ||
| # under the terms of the GNU General Public License version 2 only, as | ||
| # published by the Free Software Foundation. | ||
| # | ||
| # This code is distributed in the hope that it will be useful, but WITHOUT | ||
| # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| # FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| # version 2 for more details (a copy is included in the LICENSE file that | ||
| # accompanied this code). | ||
| # | ||
| # You should have received a copy of the GNU General Public License version | ||
| # 2 along with this work; if not, write to the Free Software Foundation, | ||
| # Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| # | ||
| # Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| # or visit www.oracle.com if you need additional information or have any | ||
| # questions. | ||
| # | ||
| # ---------------------------------------------------------------------------------------------------- | ||
|
|
||
| import argparse | ||
| import datetime | ||
| import os | ||
| import subprocess | ||
| import sys | ||
| import time | ||
|
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| def _parse_args(args): | ||
| parser = argparse.ArgumentParser( | ||
| prog="ps_poller", | ||
| description="Run target_cmd and periodically poll it for RSS using ps", | ||
| usage="ps_poller [OPTIONS] <target_cmd>", | ||
| epilog="The target_cmd process is ran in a new session, and the RSS data of every process in that session is summed up for each poll", | ||
| ) | ||
|
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| parser.add_argument("-f", "--output-file", help="File to which to write the polled RSS data (in KB)") | ||
| parser.add_argument( | ||
| "-i", "--poll-interval", type=float, help="Interval between subsequent polling, in seconds", default=0.1 | ||
| ) | ||
| parser.add_argument("target_cmd", nargs=argparse.REMAINDER, help="Command to run and poll for RSS data") | ||
|
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| args = parser.parse_args() | ||
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| output_file = args.output_file | ||
| if output_file is None: | ||
| ts = datetime.datetime.now().strftime("%Y%m%d-%H%M%S") | ||
| output_file = os.path.join(os.getcwd(), f"ps_poller_rss_samples_{ts}.txt") | ||
|
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| return output_file, args.poll_interval, args.target_cmd | ||
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| def _start_target_process(target_cmd): | ||
| print(f"Starting and attaching to command: \"{' '.join(target_cmd)}\"") | ||
| return subprocess.Popen(target_cmd, start_new_session=True) | ||
|
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| def _poll_session(sid, out_file): | ||
| # Get RSS for every process in session | ||
| args = ["ps", "-g", str(sid), "-o", "rss"] | ||
| try: | ||
| ps_proc = subprocess.Popen(args, stdout=out_file) | ||
| ps_return_code = ps_proc.wait() | ||
| if ps_return_code != 0: | ||
| print(f"Command {ps_proc.args} failed with return code {return_code}!") | ||
| return ps_return_code | ||
| except: | ||
| print(f"An exception occurred when trying to start subprocess with {args}") | ||
| return 1 | ||
|
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|
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| def main(args): | ||
| output_file, poll_interval, target_cmd = _parse_args(args) | ||
|
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| with open(output_file, "w") as f: | ||
| target_proc = _start_target_process(target_cmd) | ||
| target_pid = target_proc.pid | ||
|
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| start_time = time.time() | ||
| target_status = target_proc.poll() | ||
| poll_return_code = 0 | ||
| while target_status is None and poll_return_code == 0: # target process not terminated | ||
| time.sleep(poll_interval) | ||
| poll_return_code = _poll_session(target_pid, f) | ||
| target_status = target_proc.poll() | ||
| end_time = time.time() | ||
|
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| if poll_return_code != 0: | ||
| f.write("FAILED") # Communicate to tracker that the RSS polling was unsuccessful | ||
| print( | ||
| "Polling for RSS failed! Any samples gathered until this moment will be ignored. Waiting for the target process without RSS polling..." | ||
| ) | ||
| target_status = target_proc.wait() | ||
| else: | ||
| print(f"Rss samples saved in file: {output_file}") | ||
| print(f"Elapsed time: {end_time - start_time:.2f}s") | ||
|
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| print(f"Target process return code: {target_status}") | ||
| return target_status # Propagate target process exit code | ||
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| if __name__ == "__main__": | ||
| sys.exit(main(sys.argv)) |