CODEWITHSUNDEEP
pythonmultiple-instanceskali-linux
Meaks
Meaks

Reputation: 21

How to count how many instances of a program are running in the system using python

I would like to know how I can count how many instances of a program are running in the system using python.

For example: if my terminal is open 3 "times", and there are 3 instances of the terminal, how could I count them using python ?

Thanks in advance

Upvotes: 0

Views: 1122

Answers (2)

Stefanhg
Stefanhg

Reputation: 105

The example provided by tenacity works well except if no instances exist matching pname then it returns None and the counter would count up every time it was executed so moved it into the function call. Stackedoverflow has too many pending edits so posting an copy of it instead of editing:

from collections import Counter
from psutil import AccessDenied, process_iter


def get_process_count(pname: str) -> int:
    process_ctr = Counter()
    for process in process_iter():
        try:
            process_cmd_list = process.cmdline()
            for p in process_cmd_list:
                process_ctr[p] += 1
        except AccessDenied:
            pass
    for p, cnt in process_ctr.items():
        if pname in p:
            return cnt
    return 0

Upvotes: 0

Hariharan Ragothaman
Hariharan Ragothaman

Reputation: 582

This problem is fairly very straightforward if one uses the psutil package in python3

Consider the code snippet below.

import psutil
from collections import Counter

process_ctr = Counter()

for process in psutil.process_iter():
    try:
        process_cmd_list = process.cmdline()
        for p in process_cmd_list:
            process_ctr[p] += 1
    except Exception:
        continue

for pname, cnt in process_ctr.items():
    print(pname, cnt)

Upon running this code, one will get the process name and count printed to stdout

Testing: I opened 3 terminals and I noticed this in the O/P: -bash 3

Sample O/P:

--pdf-renderer 2
--js-flags=--jitless 2
--renderer-client-id=657 1
--launch-time-ticks=75930041264 1
--renderer-client-id=658 1
--launch-time-ticks=76065123981 1
--seatbelt-client=151 4
--renderer-client-id=659 1
--launch-time-ticks=76065777110 1
--renderer-client-id=663 1
--launch-time-ticks=76077686392 1
--renderer-client-id=100 1
--launch-time-ticks=1656826210 1
--renderer-client-id=665 1
--launch-time-ticks=76250675532 1
--seatbelt-client=168 11
--renderer-client-id=666 1
--launch-time-ticks=76252057630 1
-bash 3
/System/Library/PrivateFrameworks/CoreFollowUp.framework/Versions/A/Support/followupd 1
/System/Library/PrivateFrameworks/PhotoAnalysis.framework/Versions/A/Support/photoanalysisd 1
/System/Library/CoreServices/ScopedBookmarkAgent 1
--renderer-client-id=672 1
--launch-time-ticks=76542560240 1
--renderer-client-id=676 1
--launch-time-ticks=76557205901 1

Note:

  1. The try, catch is needed as psutil cannot access some process details, as they are owned by the kernel.

Based on user feedback, adding some neat code, just to get the count for the process of interest.

import psutil
from collections import Counter

process_ctr = Counter()

def get_process_count(pname):
    for process in psutil.process_iter():
        try:
            process_cmd_list = process.cmdline()
            for p in process_cmd_list:
                process_ctr[p] += 1
        except Exception:
            continue

    for p, cnt in process_ctr.items():
        if pname in p:
            return cnt

if __name__ == '__main__':
    cnt = get_process_count('qterminal')
    print(f"The cnt is:{cnt}")

Upvotes: 4

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