sigdump 0.0.1

Use signal to show stacktrace of a Python process

Use signal to show stacktrace and garbage collection stats of a Python process like frsyuki/sigdump.

Usage

Server example to enable sigdump is below:

import os
from wsgiref.simple_server import make_server

import sigdump


def application(env, start_response):
    start_response('200 OK', [('Content-type', 'text/plain; charset=utf-8')])
    return [b'Hello World']


if __name__ == '__main__':
    sigdump.enable(verbose=True)  # just calling sigdump.signal()

    print("pid:", os.getpid())
    httpd = make_server('', 8000, application)
    httpd.serve_forever()

$ python example/wsgi.py
pid: 57650
SIGDUMP is enabled. The result is exported to /tmp/sigdump-82323.log.

Then sending a SIGCONT signal. Please set SIGDUMP_SIGNAL environment variable if you want to change the signal.

$ kill -s SIGCONT 57650

See /tmp/sigdump-<pid>.log. Please set SIGDUMP_PATH environment variable if you want to change the output path. You can set "-" here to dump to STDOUT, or "+" to STDERR.

$ less /tmp/sigdump-57650.log
Sigdump at 2019-12-06 21:04:55.071633 process 57650

  Stacktrace:
  File "example/wsgi.py", line 15, in <module>
    httpd.serve_forever()
  File "/Users/c-bata/.pyenv/versions/3.7.1/lib/python3.7/socketserver.py", line 232, in serve_forever
    ready = selector.select(poll_interval)
  File "/Users/c-bata/.pyenv/versions/3.7.1/lib/python3.7/selectors.py", line 415, in select
    fd_event_list = self._selector.poll(timeout)

   GC stat:
     Generation 0:
       collections   : 33
       collected     : 99
       uncollectable : 0
     Generation 1:
       collections   : 2
       collected     : 253
       uncollectable : 0
     Generation 2:
       collections   : 0
       collected     : 0
       uncollectable : 0

LICENSE

MIT License

Copyright (c) 2016 Masashi SHIBATA

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.