test script to understand the elapsed time of a remoto (ssh) call for a basic cephadm -h command

cephadmremoto.py

import datetime
import os
import json
# 1. ensure your host has python3-remoto installed
import remoto

# 2. Pick the location of the cephadm 'binary' to ship to the target
# cephadm_path = '/home/paul/git/ceph/src/cephadm/cephadm'
# cephadm_path = '/usr/sbin/cephadm'
cephadm_path = '/root/bin/cephadm'

# 3. define the user account to use that has passwordless ssh
ssh_user = 'root'

# 4. define the target host
target_host = 'rhs-srv-02'


def profile_it(f):
    def timer(*args, **kwargs):
        stime = datetime.datetime.now()
        print(f.__name__ + " starting @ " + str(stime))
        result = f(*args, **kwargs)
        etime = datetime.datetime.now()
        elapsed = etime - stime
        print(f.__name__ + " ended @ " + str(etime))
        print(f.__name__ + " elapsed time: " + str(elapsed))
        return result
    return timer


class RemoteExec:

    def __init__(self, user, host, command='', args=''):
        self.user = user
        self.target = host
        self.cmd = command
        self.cmd_args = args
        self.script = self._load_script()

    @profile_it
    def _load_script(self):
        with open(cephadm_path, 'r') as f:
            data = f.read()
        return data

    @profile_it
    def _get_connection(self):
        con = remoto.Connection(
            f'{self.user}@{self.target}',
            sudo=False
        )
        return con

    @profile_it
    def exec(self, con):
        script = "injected_argv = " + json.dumps(['-h']) + "\n"
        script += self.script
        out, err, code = remoto.process.check(
            con,
            ['/usr/bin/python3', '-u'],
            stdin=script.encode('utf-8')
        )
        return out, err, code


def main():
    r = RemoteExec(ssh_user, target_host, args='-h')
    stime = datetime.datetime.now()
    con = r._get_connection()
    out, err, code = r.exec(con)
    etime = datetime.datetime.now()
    elapsed = etime - stime
    if not code:
        lines = ''
        for line in out:
            lines += line + '\n'
        print(lines)
        print("\n")
        print(f"elapsed time to connect and execute a cephadm -h : {str(elapsed)}")


if __name__ == "__main__":
    main()