Does Syrupy monitor descendent processes?

[wwood]

I couldn't see this mentioned in the README.

Thanks.

[jeetsukumaran]

It reports whatever ps reports for the process in question.

[wwood]

So, the answer is "no" then. Pity. Ben WoodcroftMicrobial informatics group leader (+617) 3443 7334 Centre for Microbiome Research, Level 3, Translational Research Institute, School of Biomedical Sciences, Faculty of Health, Queensland University of Technology

…

On May 26 2021, at 3:55 pm, Jeet Sukumaran ***@***.***> wrote: It reports whatever ps reports for the process in question. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub (#20 (comment)), or unsubscribe (https://github.com/notifications/unsubscribe-auth/AAADX5H7PBVAFGGITV63S3DTPSENDANCNFSM45RATCOQ).

[jeetsukumaran]

I'd be happy to accept a PR that modified Syrupy to filter processes by PPID, but otherwise, yes.

[milahu]

just made this with psutil:
print the cumulated cpu + memory usage of a process tree

nix-daemon-profiler.py

#!/usr/bin/env python3

# print the cumulated cpu + memory usage of a process tree

# loosely based on https://gist.github.com/meganehouser/1752014
# license: MIT

# pip install psutil prefixed
# nix-shell -p python3 python3.pkgs.{psutil,prefixed}

import psutil
from prefixed import Float

import time
import sys
import os
import shlex
import io

config_interval = 1
config_root_process_name = 'nix-daemon'

# debug: print env of every proc. verbose!
config_print_env_vars = False

#psutil.cpu_percent() # start monitoring cpu

cpu_count = psutil.cpu_count()
cpu_width = len(str(cpu_count * 100))
if cpu_width < len('load'):
  cpu_width = len('load')

# https://psutil.readthedocs.io/en/latest/#recipes
def find_procs_by_name(name):
  "Return a list of processes matching 'name'."
  ls = []
  for p in psutil.process_iter(['name']):
    if p.info['name'] == name:
      ls.append(p)
  return ls

def find_root_process(name):
  ls = find_procs_by_name(name)
  if len(ls) == 0:
    # return the first process
    # inside the nix-build sandbox, this is bash
    for p in psutil.process_iter():
      return p
  if len(ls) != 1:
    print(f"find_root_process: found multiple root procs:")
    for p in ls:
      print(f"  {p}")
    print(f"find_root_process: root_process = {ls[0]}")
  #assert len(ls) == 1 # !=1 when build is running
  return ls[0]


ps_fields = ['pid', 'ppid', 'name', 'exe', 'cmdline', 'cwd', 'environ', 'status', 'cpu_times', 'cpu_percent', 'memory_percent', 'memory_info']
# TODO num_threads?

if config_print_env_vars:
  ps_fields.append('environ')

def get_process_info(root_process):

  process_info = dict()

  found_root_process = False

  for process in psutil.process_iter(ps_fields):

    pid = process.info["pid"]

    # find start of tree
    if pid == root_process.pid:
      found_root_process = True
      process_info[pid] = process.info

      # TODO refactor
      process_info[pid]["child_pids"] = list()
      process_info[pid]["sum_cpu"] = process_info[pid]["cpu_percent"]
      process_info[pid]["sum_mem"] = process_info[pid]["memory_percent"]
      process_info[pid]["sum_rss"] = process_info[pid]["memory_info"].rss
      # ncp = number of child processes
      # will be set in cumulate_process_info
      process_info[pid]["sum_ncp"] = 1 # 1 = include self
      # pretty
      if len(process_info[pid]["cmdline"]) == 0:
        process_info[pid]["cmdline"] = [os.path.basename(process_info[pid]["exe"])]
      else:
        # full path of info["cmdline"][0] is in info["exe"]
        process_info[pid]["cmdline"][0] = os.path.basename(process_info[pid]["cmdline"][0])

      continue

    if found_root_process == False:
      continue

    # exclude self
    if pid == os.getpid():
      continue

    # find children of tree
    ppid = process.info["ppid"]
    if ppid in process_info:
      process_info[pid] = process.info

      # TODO refactor
      process_info[pid]["child_pids"] = list()
      process_info[pid]["sum_cpu"] = process_info[pid]["cpu_percent"]
      process_info[pid]["sum_mem"] = process_info[pid]["memory_percent"]
      process_info[pid]["sum_rss"] = process_info[pid]["memory_info"].rss
      process_info[pid]["sum_ncp"] = 1
      # pretty
      if len(process_info[pid]["cmdline"]) == 0:
        process_info[pid]["cmdline"] = [os.path.basename(process_info[pid]["exe"])]
      else:
        # full path of info["cmdline"][0] is in info["exe"]
        process_info[pid]["cmdline"][0] = os.path.basename(process_info[pid]["cmdline"][0])

      process_info[ppid]["child_pids"].append(pid)

  return process_info


def cumulate_process_info(process_info, parent_pid):
  for child_pid in process_info[parent_pid]["child_pids"]:
    cumulate_process_info(process_info, child_pid) # depth first
    process_info[parent_pid]["sum_cpu"] += process_info[child_pid]["sum_cpu"]
    process_info[parent_pid]["sum_mem"] += process_info[child_pid]["sum_mem"]
    process_info[parent_pid]["sum_rss"] += process_info[child_pid]["sum_rss"]
    process_info[parent_pid]["sum_ncp"] += process_info[child_pid]["sum_ncp"]
    #process_info[parent_pid]["sum_ncp"] += len(process_info[child_pid]["child_pids"])
  process_info[parent_pid]["ncp"] = len(process_info[parent_pid]["child_pids"])
  process_info[parent_pid]["sum_ncp"] += process_info[parent_pid]["ncp"]


def print_process_info(process_info, root_pid, file=sys.stdout, depth=0):

  if depth == 0:
    t = time.strftime("%F %T %z")
    #print(f"\n{'load':<{cpu_width}s} mem rss  vms  proc @ {t}", file=file)
    #print(f"\n{'load':<{cpu_width}s} mem rss  Ncp ncp  proc @ {t}", file=file)
    print(f"\n{'load':<{cpu_width}s}  rss spr cpr proc @ {t}", file=file)
    #print(f"\n{'load':<{cpu_width}s} mem proc @ {t}", file=file)
    # spr = sum of all child processes, including self
    # cpr = number of first child processes, excluding transitive children

  indent = " "
  info = process_info[root_pid]
  sum_cpu = info["sum_cpu"] / 100 # = load
  sum_mem = info["sum_mem"]
  sum_rss = info["sum_rss"]
  sum_ncp = info["sum_ncp"]
  ncp = info["ncp"]
  name = info["name"]
  cmdline = info["cmdline"]
  # value None == psutil.AccessDenied
  exe = info["exe"] # always None
  cwd = info["cwd"] # always None
  environ = info["environ"] # always None
  child_procs = len(info["child_pids"])
  if len(cmdline) > 0:
    #cmdline[0] = os.path.basename(cmdline[0]) # full path is in info["exe"]
    if cmdline[0] in {"g++", "gcc"}: # TODO fix other verbose commands
      # make gcc less verbose
      cmdline_short = []
      skip_value = False
      for arg in cmdline:
        if skip_value:
          skip_value = False
          continue
        if arg in {"-I", "-B", "-D", "-U", "-isystem", "-idirafter", "--param", "-MF", "-dumpdir", "-dumpbase", "-dumpbase-ext"}:
          # -isystem is the most frequent
          skip_value = True
          continue
        if arg in {"-pthread", "-pipe", "-MMD", "-MD", "-MT", "-quiet", "--64"}:
          continue
        if arg[0:2] in {"-I", "-B", "-D", "-U", "-m", "-O", "-W", "-f", "-g"}:
          continue
        if arg.startswith("-std="):
          continue
        if arg.startswith("--param="): # ex: --param=ssp-buffer-size=4
            continue
        cmdline_short.append(arg)
      cmdline = cmdline_short

    if cmdline[0] in {"g++", "gcc"}:
      # hide child procs
      process_info[root_pid]["child_pids"] = []
  # TODO print cwd only when different from parent process
  #log_info = {"cmdline": cmdline}
  log_info = {}
  if depth == 0:
    log_info["cwd"] = cwd
  else:
    parent_cwd = process_info[info["ppid"]]["cwd"]
    if cwd != parent_cwd:
      log_info["cwd"] = cwd
  log_info["exe"] = exe
  #if depth == 0:
  #  log_info["environ"] = environ # spammy
  info_str = ""
  if len(cmdline) > 0 and cmdline[0] in {"g++", "gcc"}:
    name = shlex.join(cmdline)
    #del log_info["cmdline"]
    #print(f"{sum_cpu:{cpu_width}.1f} {sum_mem:3.0f} {Float(sum_rss):4.0h} {depth*indent}{name} info={repr(log_info)}", file=file)
    # g++ has always 2 child procs: cc1plus, as
    # g++ has always the same cwd as its parent
  elif name in {"stress-ng"}:
    if process_info[info["ppid"]]["name"] == name:
      # fork
      pass
    else:
      # root process of stress-ng
      name = shlex.join(cmdline)
  else:
    name = shlex.join(cmdline) # print cmdline for all commands
    if log_info:
      info_str = f" # {repr(log_info)}"

  mebi = 1024 * 1024

  #print(f"{sum_cpu:{cpu_width}.1f} {sum_mem:3.0f} {Float(sum_rss):4.0h} {sum_ncp:3d} {ncp:3d} {depth*indent}{name}{info_str}", file=file)
  #print(f"{sum_cpu:{cpu_width}.1f} {sum_ncp:3d} {Float(sum_rss):4.0h} {ncp:3d} {depth*indent}{name}{info_str}", file=file)
  print(f"{sum_cpu:{cpu_width}.1f} {(sum_rss / mebi):4.0f} {sum_ncp:3d} {ncp:3d} {depth*indent}{name}{info_str}", file=file)

  if config_print_env_vars:
    for k in info["environ"]:
        v = info["environ"][k]
        print(f"                   {depth*indent} {k}: {repr(v)}", file=file)

  for child_pid in process_info[root_pid]["child_pids"]:
    print_process_info(process_info, child_pid, file, depth + 1)


def main():

  root_process = find_root_process(config_root_process_name)

  max_load = int(os.environ.get("NIX_BUILD_CORES", "0"))
  total_cores = os.cpu_count()
  check_load = 0 < max_load and max_load < total_cores
  max_load_tolerance = 0.20 # 20%
  tolerant_max_load = max_load * (1 + max_load_tolerance)

  check_load = False # debug. TODO expose option

  try:

    while True:

      process_info = get_process_info(root_process)

      cumulate_process_info(process_info, root_process.pid)

      if check_load:
        total_load = process_info[root_process.pid]["sum_cpu"] / 100
        if total_load < tolerant_max_load:
          # load is not exceeded -> dont print
          continue
        else:
          print(f"\nnix_build_profiler: load exceeded. cur {total_load:.1f} max {max_load}")

      string_file = io.StringIO()
      print_process_info(process_info, root_process.pid, file=string_file)
      print(string_file.getvalue(), end="") # one flush

      time.sleep(config_interval)

  except KeyboardInterrupt:
    sys.exit()

if __name__ == "__main__":

  main()

example output:

load mem proc @ 2022-06-23 20:41:10 +0200
 3.1   1 nix-daemon
 3.1   1   nix-daemon
 3.1   0     bash
 3.1   0       bash
 3.1   0         stress-ng
 1.0   0           stress-ng
 1.0   0           stress-ng
 1.0   0           stress-ng

(load 1.0 = 100% cpu usage)

similar to

ps -H

    PID TTY          TIME CMD
3124648 pts/4    00:00:00 bash
3126176 pts/4    00:00:02   bash
3132605 pts/4    00:00:01     bash
3138167 pts/4    00:00:17       python
3141661 pts/4    00:00:01       bash
3143570 pts/4    00:00:01         bash
3171922 pts/4    00:00:00           ps