The process-management tag has no wiki summary.
4
votes
1answer
46 views
Understanding when background process gets terminated
I have a script which starts a number of background processes and if works fine when called from the cmdline.
However the same script is also called during my xsession startup and additionally on ...
3
votes
1answer
70 views
A script's background process is still alive after closing the terminal
This is more of a process management/signal handling question than a Bash question. It just uses Bash to explain the issue.
I'm running a Bash script in which I run a background process.
This is the ...
2
votes
2answers
69 views
End process from another SSH window
I forgot to use screen and I have a task that has been running for quite some time, and I do not want to lose the saved data. Basically Ctrlc will end the task and save the data if I am on the same ...
11
votes
4answers
282 views
Is there a top-like command that shows the network bandwidths and file accesses of running processes
For example, we'd like to see:
PROCESS IF TX RX FILE(regular) R/W
prog1 eth0 200kB/s 12kB/s -- --
wlan0 12kB/s 100kB/s -- ...
1
vote
2answers
175 views
multiple background processes in a script
Suppose if i have a situation in which some files need to be copied and it takes long time so
i would have to go for parallel processing of the file copy.
for example it may look like this
for i in ...
14
votes
2answers
444 views
How are the processes in UNIX numbered?
I can't find any pattern when I look at the numbering of PIDs in process table (ps -a), as the PIDs are not subsequent numbers and sometimes there are large "gaps" between those numbers.
Is it ...
1
vote
1answer
91 views
Managing the output streams of many subprocesses with deadlocks
I have a Python script that does more or less this
current_tasks = TaskManager()
MAXPROCS = 8
while len(outstanding_tasks) > 0:
if len(current_tasks.running) < MAXPROCS:
...
1
vote
2answers
113 views
Host process for multiple processes?
I am maintaining an application that currently consists of 4 processes that are dependant on each other in various ways. At the moment these processes are started, stopped and monitored via a rather ...
4
votes
1answer
74 views
How can I synchronize processes started in different TMUX panes?
Consider this:
tmux split-window -d program1
program2 # this program depends on some side effects produced by program1
In this case, program2 will start before program1 is ready. program1 will send ...
4
votes
1answer
217 views
What does <defunct> mean in the output of ps?
I had issued the ps -ef|grep java command and this is one of the entries that I got :
subhrcho 875 803 0 Jan23 pts/5 00:02:27 [java] <defunct>
What is <defunct> implying here ? ...
3
votes
1answer
142 views
What is the difference between exiting a process via Ctrl+C vs issuing a kill -9 command?
I know I can kill any process with kill -9 command . But sometimes i see that even if I have terminated a program with CTRL+C , the process doesn't get killed . So I want to know the difference ...
0
votes
3answers
252 views
What is the difference between ps and top command?
What is the difference between ps and top command ? I see that both can display information about running processes . Which one should be used when ?
1
vote
3answers
195 views
What happens to suspended jobs in unix?
We can issue CTRL+Z to suspend any jobs in Unix and then later on bring them back to life using fg or bg. I want to understand what happens to those jobs that are suspended like this ? Are they ...
1
vote
1answer
73 views
How to ensure a process has started reading a file before continuing?
I'm trying to write a command to test that data is written to a file. My first approach was:
Start reading in the background.
Write some data to the file.
Wait for the reader to find a result.
...
0
votes
0answers
96 views
Very large values for utime and stime for foo. Is foo still running?
I am running a program foo
It has been running for close to 30 days now (even more)
Until around 10 days ago (I cannot be very exact) it used 100% of one cpu on my dual core laptop (it was at the ...
1
vote
3answers
134 views
Killing all the process of a command except first process
I am sometimes stuck in a situation where a script/command kept in Cron runs more than once because of some reasons (the first instance is not completed fully, the second instance of the same process ...
3
votes
2answers
249 views
What is meant by stack in connection to a process?
From the book Advanced programming in the Unix environment I read the following line regarding threads in Unix like systems
All the threads within a process share the same address space, file
...
5
votes
4answers
3k views
'kill java' doesn't kill java
I am running debian right now and sometimes I need to kill java manually from the terminal, but when I try kill #pid# or pkill java nothing happens. No console output (ok, that's normal) and java is ...
1
vote
3answers
152 views
How can I kill a job that was initiated in another shell (terminal window or tab)?
If I begin a process and background it in a terminal window (say ping google.com &), I can kill it using kill %1 (assuming it is job 1).
However if I open another terminal window (or tab) the ...
1
vote
1answer
31 views
Task management tools with keyboard navigation that run in a terminal
I recently learned that I can use top with my keyboard to kill processes (k), show processes for a specific user only (u), etc. But I was wondering if there is a way of selecting processes from the ...
5
votes
2answers
388 views
kill -9 hangs, unable to kill process (murder proof process) [duplicate]
Possible Duplicate:
What if ‘kill -9’ does not work?
I guess its a bit late to ask this, but for future reference;
I was called to look at a server today after a customer was reporting ...
5
votes
2answers
2k views
Per process firewall?
I've been reading around but can't seem to find a way to create per-process firewall rules. I know about iptables --uid-owner but that only works for outgoing traffic. I've considered scripting ...
4
votes
2answers
1k views
How to Throttle per process I/O to a max limit?
I'm looking for a way to limit a processes disk io to a set speed limit. Ideally the program would work similar to this:
$ limitio --pid 32423 --write-limit 1M
Limiting process 32423 to 1 megabyte ...
2
votes
2answers
89 views
How to constrain the resources an application can use on a linux web server
This is the situation:
I have a PHP/MySQL web application that does some PDF processing and thumbnail creation. This is done by using some 3rd party command line software on the server. Both kinds of ...
1
vote
2answers
251 views
Putting Linux processes on certain CPU cores [duplicate]
Possible Duplicate:
How can I set the processor affinity of a process on Linux?
Computer CPUs have many cores insde them nowadays.
I have always wondered if there is a way to, when I start ...
8
votes
6answers
3k views
How to make a process invisible to other users?
How could you launch a process and make it invisible to the top command? The process is started by a normal user (not root), and should not be visible to other normal users.
2
votes
0answers
395 views
`[java] <defunct>` with defunct children -> Any way to collect them?
Relating to question : What if 'kill -9' doesn't work?
I have following situation : zombie process with threads, not collected by init :
[root@Arch64]# ps auxH | grep java
gwpl 569 ...
4
votes
1answer
134 views
Discard stdout of a command for t seconds
I am working on some batch scripts involving the following:
Run some non-terminating sub-processes (asynchronously)
Wait for t seconds
Perform other task X for some time
Terminate subprocesses
...
10
votes
8answers
1k views
Ensure a process is always running
I started hosting sites a while back using Cherokee. For external sources (FastCGI, etc) it has an option to launch the process if it can't find one running on the designated socket or port. This is ...
10
votes
3answers
8k views
How can I kill a <defunct> process whose parent is init?
Transmission is intermittently hanging on my NAS. If I send SIGTERM, it doesn't disappear from the process list and a <defunct> label appears next to it. If I send a SIGKILL, it still doesn't ...
4
votes
2answers
350 views
Set process exclusivity in Linux
I am trying to measure the performance of a process. I have widely ranging performance measurements on small bit of single-threaded deterministic code that should perform the same every time.
I would ...
1
vote
1answer
270 views
Cross-platform (Linux, BSD, Solaris) way to check if pid exists
I am looking for a reliable cross-platform way to check if a process with a specific pid is running. Two possible solutions came up:
kill -0 $PID — exit status is 0 if it the process exists and 1 ...
23
votes
2answers
2k views
Why is the default process creation mechanism fork?
The UNIX system call for process creation, fork(), creates a child process by copying the parent process. My understanding is that this is almost always followed by a call to exec() to replace the ...
2
votes
0answers
89 views
Need good ideas about improving any Linux service [closed]
I have a project assigned to me by OS teacher to choose any Linux service and improve it. Currently I am totally blank in this. I am not sure which service should I use which can easily be implemented ...
1
vote
1answer
271 views
How can I manage jobs after I disconnect from my tty/ssh session?
If I ssh to a box and start a task that will take some time to complete I usually press control+z to pause the process, and then immediately type bg 1 to put run it in the background.
I can then type ...
1
vote
3answers
56 views
What are the proper tools to setup a remote compilation and running (something like ideone)?
I'm trying to achieve similar functionality in a server for community programming and I've drafted this to wrap up another take on oneide's functions:
From a Perl CGI I build a script like this (not ...
5
votes
3answers
223 views
Undo bg; Undo putting a process into the background?
I've started a long running and machine hog process. I've hit CTRL-Z to stop it. I've then put it in the background with bg. Oops, I should have restarted with fg so that I could easily stop and start ...
4
votes
1answer
90 views
Is it the process that cleans itself on termination or the kernel?
Recently I found this in a powerpoint presentation:
When a program is compiled and linked, the linker inserts some extra code in the program. It is this code that calls the main function about the ...
2
votes
4answers
540 views
How to run java process to be seen not as 'java…' in processes list?
Is it possible to run a Java process in Linux in a way that it could be seen in ps as some sort of alias? It would be easier to restart it when it is down.
6
votes
1answer
2k views
How to check, which limit was exceeded? (Process terminated because of ulimit. )
Let's assume process runs in ulimited environment :
(
ulimit ... -v ... -t ... -x 0 ...
./program
)
Program is terminated.
There might be many reasons : memory/time/file limit exceeded ; just ...
2
votes
1answer
270 views
Does a process invoking oom-killer kill itself?
Looking through syslog, I see lines like dd invoked oom-killer.
Does this mean dd is being killed by the oom-killer or does it mean dd asked oom-killer to go kill another high memory process?
4
votes
2answers
259 views
Simple queuing system?
Given a commodity PC, we would like to use it to execute some tasks in the background round the clock.
Basically, we would like to have commands like:
add-task *insert command here*
list-tasks
...
4
votes
3answers
514 views
What is a command to find priority of process in Linux?
How can i view the priority of a specific process ?
0
votes
1answer
1k views
How to know how long a process has been running? [duplicate]
Possible Duplicate:
How to check how a long a program has been running?
I am interested in doing this purely using bash.
9
votes
2answers
468 views
Getting a window's PID by clicking on it
Is there any package which shows PID of a window by clicking on it?
2
votes
1answer
3k views
What does this process STAT indicates?
If you check the STAT column in above image you will see Ss S S< SN and R+
What does this indicates ? Process states.
If yes,Then what is the significance of 'Ss S< SN and R+'?
2
votes
2answers
487 views
Removing zombie process from the process table
Can somebody please explain when parent process receives the exit status of a dead child process via wait, who actually reallocates the memory of the child process and removes it from the process ...
3
votes
2answers
726 views
Program to test CPU load and process priority
I am running some test on Amazon EC2 instances and we want to make the CPU always busy at above 80%.
What I have is a program main that needs to run in high priority and I want to launch another ...
1
vote
1answer
943 views
How to check if process already exists in python script? [duplicate]
Possible Duplicate:
Check for process already running in webfaction?
How can I check if a process is already being run using Python + Django on WebFaction hosting?
For example, my process ...
6
votes
1answer
1k views
What is the maximum value of the PID of a process?
What is the maximum value of the PID of a process?
Also, is it possible to change the PID of a running process?
