Questions tagged [process-management]
Use this tag when the topic is about system process management. Commands used for this are like ps and kill -9 xxxx and service xyz start|stop|restart and htop, for example. Often used in conjunction with memory management.
355
questions
0
votes
0
answers
15
views
Pm2 is unable to run nodejs microservices after nodejs upgradation from v10.24.1 to v16.15.1
I have upgraded from nodejs 10.24.1 to 16.15.1 on my centos machine. and updated my pm2 to latest version, and ran pm2 update all the microservice process where running sucesffully. But on rebbot the ...
- 11
0
votes
0
answers
26
views
Fuser shows non-existing processes, so NVIDIA GPU reset fails
I am trying to reset an NVIDIA A100 card that still has memory occupied, but no process is using it. First, I killed all processes using any NVIDIA card with
sudo fuser -k /dev/nvidia*
then run the ...
- 299
-2
votes
1
answer
126
views
How to find one of multiple processes with the same name using pgrep (or another tool)? [closed]
I have several bash scripts running. The only thing that differs between them is the pid. I want to write a script like this that only monitors one specific bash process and exclude any daughter ...
- 1,713
0
votes
0
answers
37
views
How can I force linux to limit the amount of time I play "games" on it per day, that would be protected from root override?
Problem:
Struggling with video game addiction.
https://www.reddit.com/r/Steam/comments/v0wj7i/is_there_a_way_to_limit_gaming_time/ Virtually no existing ways to limit gaming, outside therapy.
I need ...
- 215
0
votes
0
answers
141
views
supervisorctl add & remove commands
Context
In the supervisor documentation, I can read the following parameters, for the supervisorctl add and supervisorctl remove control commands:
add <name> […]
Activates any updates in config ...
- 19.5k
0
votes
0
answers
96
views
Embed script into docker container to run after main process starts
For a particular docker image (based on alpine) I want to run some custom code after the container starts. I want that code inside the container, so it's easy to use and everything is self-contained. ...
- 1,639
1
vote
1
answer
269
views
How to stop "tail -f" in a script and exit if a certain condition is fulfilled?
I'm trying to come up with a script for managing jobs on a supercomputer. The details don't matter much, but a key point is that the script starts to tail -f a file once it appears. Now this would run ...
- 286
1
vote
0
answers
187
views
Identifying suspicious bash process (high cpu and ram usage)
A couple of days ago I noticed a bash process in htop on my Arch system with relatively high, fluctuating cpu and ram usage. Started closing windows one by one to try pinpointing it, when I closed ...
- 11
1
vote
1
answer
92
views
^C SIGINT does not work in adb shell in Linux
I am working on an embedded Linux system, which uses kernel-5.10.24.
It uses busybox as init, and has other utilities in rootfs, including adbd.
I can run adb shell from PC to login to the embedded ...
- 327
0
votes
1
answer
59
views
Is it possible to defer reaping of background processes in bash?
If I just run sleep 1 & in bash, the sleep process will get reaped almost instantly after it dies. This happens whether job control is enabled or disabled. Is there a way I can make bash hold off ...
1
vote
2
answers
92
views
Is there a performance penalty for backgrounding a process?
If I do:
sleep 1
versus
sleep 1 & wait $!
will there be any difference in terms of CPU usage for spawning a foreground process versus a background process? Or will the performance of both lines ...
- 179
0
votes
0
answers
34
views
Is there any way for supervisord to reload only a single program configuration?
Supervisord looks nice at first glance, and I'm already used to it the way I get used to any tool after a while even if it is suboptimal. But I'm getting more and more annoyed with one situation: I ...
- 518
0
votes
0
answers
36
views
Spawning a second terminal with inherited environment
From a shell running in one terminal window, I'd like to be able to run a command that spawns a second shell in a new terminal window, inheriting the environment of the first shell.
With an executable ...
- 1,848
1
vote
1
answer
34
views
Process name as the called executable, not the calling script
Edit: I relalised after posting the below that the machine where this 'worked' had in fact not been restarted and the running processes had been launched using an older scheme of actual aliases (...
- 33
0
votes
0
answers
23
views
How do I make it so that when a user logs out, all of the stuff they were doing gets forcefully terminated?
I have a server where there is a user that runs browsh when logged in. When I terminate the process really quick when it starts several times, the server gets really, really slow.
How do I make it so ...
0
votes
1
answer
96
views
How to determine which processes are running on outdated packages and needs restarting?
So, I know that it is possible to view or recover deleted files that are currently being used by a process. I've found out that this also applies to packages that were updated. So, let's say we update ...
- 1
0
votes
0
answers
13
views
Suspend/terminate a shell script running in background and called from another shell script
If I run the shell script below :
#!/bin/bash
/bin/bash loop.sh &
that calls this one (loop.sh) :
#!/bin/bash
while true
do
echo "Hello"
done
I can't suspend it (ctrl + z) or ...
- 131
2
votes
1
answer
360
views
How does round-robin scheduling and context switching work from a low-level?
Using round-robin scheduling, the kernel provides time slices for different processes / tasks.
It seems that the kernel will initialize a timer, and when the timer times out, this will cause the ...
- 1,121
2
votes
1
answer
631
views
Bash to instruct parent process to exit by certain PID's kill
How is the correct bash command/instruction to exit parent process by certain signal or PID's kill when being in child process?
user531439
2
votes
0
answers
111
views
Large process id on rocky linux 8.5
I started using rocky linux 8.5, I have added cron to reboot this server everyday. server reboots everyday.
When I start some application on this server the process id I get is very large.
It don't ...
- 21
0
votes
1
answer
20
views
Find filepath that spawned process
I am using a Debian 9.13. Trough ps -aux | grep NaughtyProcessName i can find information about a given process that interests me in the format:
user.name [ID] [CPU USAGE] [%MEM] VSZ RSS TTY STAT ...
1
vote
2
answers
303
views
Best way to get resource usage information for a process?
What would be the best way to go about monitoring resource usage of certain running processes? For example if I wanted to generate log files of CPU and memory usage over time.
From what I understand ...
- 19
1
vote
0
answers
289
views
How long can kill -9 take
I am writing a custom process manager, that executes commands and monitors their execution. On their termination sometimes I want to terminate some running processes and execute other processes. I ...
- 11
0
votes
1
answer
122
views
how to make sure 2 apps on 2 different servers but at the same time only 1 app on 1 server running
I am having an app written in java, the app is deployed on 2 servers. However I can only launch the app on one server. If I run the app on both servers there will be a conflict. So I'm looking for a ...
- 87
2
votes
1
answer
2k
views
How do I kill all subprocesses spawned by my bash script?
I have a script that looks like this. Invoked with ./myscript.sh start
#!/bin/bash
if [[ "$1" == "start" ]]; then
echo "Dev start script process ID: $$"
cd /my/path1
...
- 23
1
vote
1
answer
294
views
What is the equivalent of "task_struct" in linux's <linux/sched.h> for Mac OS?
I want to understand the Process Control block of Mac OS and Linux. For Lionux it was pretty strightforward, there was a post here asking about the same thing and someone replied to go take a look at &...
- 13
0
votes
3
answers
410
views
Why does the same process bounce around on different "CPUs"?
I am doing some performance troubleshooting of some long running jobs which start processes that consume entire CPU cores, but are single-threaded. I observed these processes bouncing around to ...
- 131
5
votes
0
answers
329
views
Why does ps not exit when listing full command line arguments? [duplicate]
Any time I attempt to run the ps command or another similar command in a way that would make it output the arguments for any process, the command runs and produces output, but then freezes, entering ...
- 874
1
vote
1
answer
1k
views
No sched_min_granularity_ns in kernel parameters
According to this post, there are three kernel parameters for controlling process scheduler:
kernel.sched_min_granularity_ns
kernel.sched_latency_ns
kernel.sched_wakeup_granularity_ns
However, on my ...
- 1,151
2
votes
2
answers
509
views
killall firefox does not kill firefox
When I had loads of firefox windows open and wanted to close them quickly I did
killall firefox
using killall from the psmisc package in Ubuntu.
Nothing happened.
I looked in the list of my processes ...
- 559
2
votes
2
answers
850
views
Autokey - Focus App Window If Running, Launch App If Not
I'm trying to obtain the processID of pcmanfm like this:
pgrep -f "pcmanfm"
When pcmanfm is not running, the command above returns nothing (as I expect).
However, when I run the command ...
- 4,975
0
votes
2
answers
132
views
List Running Commands of All Windows
You can list the process ID of each widow with this command:
wmctrl -lp
Does there exist a command that shows the running command of each window (kind of like htop has a column for "Command"...
- 4,975
0
votes
1
answer
90
views
Why do my orphaned grandchildren die only if they produce output?
I am tending to a program "master" which manages a set of concurrently running sub-processes "slaves". Sub-processes are launched and killed as needed. Many of these sub-processes ...
- 5,799
1
vote
1
answer
1k
views
Kill all of my processes that were started within the past hour?
How do I kill all processes with my username that were started within (past hour, past day) etc?
- 137
3
votes
0
answers
263
views
Running process (not a zombie) that's impossible to kill
Yes, I know this question has been asked tens if not hundreds of times before. Still, I went through all similar questions and tried everything listed on them, to no avail.
After compiling some code ...
- 131
0
votes
2
answers
119
views
How can I make cdrecord have UNINTERRUPTED use of system resources?
I'd like to burn thirty mp3 songs to a CD-R, using say cdrecord. But I'd like to
use my laptop for other things at the same time (such as using the Kate editor
and the Internet).
However, I've read ...
- 49
0
votes
1
answer
162
views
How to stop a process permanently for every session?
I have a laptop with minimal resources and this process, "gnome-software", takes up huge space in RAM. I have to kill it every time.
Is there permanent way to stop this process?
- 103
1
vote
1
answer
114
views
how to detect and stop a script which calls itself in background and exits
i was working on writing a wrapper script for a tool. the wrapper script should prepare the environment and then call the tool in background then exit. it looks something like this:
#!/bin/bash
export ...
- 27k
1
vote
0
answers
143
views
What could account for a very, very large change in pid's in a short amount of time?
On an Ubuntu 20.x server, we are having some OOM Killer issues, where it kills a Java process. We have been unable to find any memory leaks.
But this morning, we got a rare gift, which is two oom-...
- 111
1
vote
0
answers
59
views
How to kill a process completely that can re-run automatically [duplicate]
A process occupies a lot of CPU, and when I kill it by kill -9, it just re-runs with another name.
How can I find it out, kill and delete it?. Its parent pid is 1, started by root user, and on the ...
user474556
1
vote
1
answer
41
views
what is the right way to know all script PIDS that runs under folder
Under the folder /home/testing/scripts on a Linux machine, we have 234 different scripts that do sanity and testing
as
/home/testing/scripts/test.network.py
/home/testing/scripts/test.hw.py
/home/...
- 12.7k
0
votes
1
answer
78
views
Start process and access the "shell" at a later time
I have a remote testing machine which is experiencing some failures. What I would like to do is trigger a gdb process upon failure on the remote machine, and then ssh into the remote machine and ...
- 335
2
votes
2
answers
624
views
Run commands in parallel and wait for one group of commands to start before starting the next
I have created a script to run two threads in parallel using for loops.
for i in 1 2
do
echo "for loop in shell script iteration begins.." & done
As expected it runs in parallel, but I ...
18
votes
1
answer
3k
views
Process states in OS theory vs in Linux
I'm trying to map Linux process state codes (as in ps) to states in the OS state diagram but I can't seem to map them. Is it because Linux process states don't necessarily match the theoretical OS ...
- 325
3
votes
0
answers
73
views
2>&1 causes process to block
I am trying to debug what I have done wrong in GNU Parallel (>=20190122).
This runs as expected:
(
echo 1 | parallel-20190122 --pipe -j0 --tee dummy {} ::: {1..1000};
echo Parallel is done here:...
- 33.8k
2
votes
0
answers
955
views
QEMU on macOS: the background process gradually freezes if the QEMU window is not visible
I have a similar setup on a Windows 10 machine that doesn't have any such issues.
This tread about macOS version 10.15.2.
If the QEMU window is not visible (hidden, minimized or another application is ...
- 21
0
votes
0
answers
225
views
CPU utilization = 101? [duplicate]
I don't understand how can the CPU utilization of my Linux system be 101 for a process on Linux system. What does the %CPU actually indicate if it is not percentage utilization?
USER PID %CPU %...
- 111
1
vote
1
answer
151
views
FIFO number of processes, sustained growth
I have a FIFO question:
Why the fifo thread_num limit 2,
but number of processes, sustained growth when one process ends,
two processes start, and then got 3 processes.
sustained growth 2n-1
#!bin/...
- 11
2
votes
3
answers
441
views
tools to start many background processes and close cleanly on sigint
I have an ad-hoc case where I as a user want to start a handful of service processes and also be able to interrupt them all together for clean and easy start-stops. The behavior of "docker-...
- 4,332
3
votes
1
answer
1k
views
Where does one find the total number of context switches performed since bootup?
I figured out that the number of context switches performed by a process can be found in /proc/$$/status. I have been trying to look for the total number of context switches performed since bootup.
I ...
- 151