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4
votes
1answer
171 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 ...
5
votes
2answers
432 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 ...
12
votes
2answers
3k 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 ...
1
vote
1answer
441 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 ...
28
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
116 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
452 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
75 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 ...
6
votes
3answers
269 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
95 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 ...
6
votes
2answers
3k 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
752 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?
3
votes
4answers
721 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.
5
votes
3answers
434 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 ...
5
votes
3answers
3k 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
2k 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.
10
votes
2answers
1k views

Getting a window's PID by clicking on it

Is there any package which shows PID of a window by clicking on it?
5
votes
1answer
8k 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+'?
3
votes
2answers
921 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
1k 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 ...
9
votes
6answers
7k 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.
11
votes
1answer
4k 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?
2
votes
2answers
648 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
3answers
300 views

What could be the bottleneck on this AIX machine?

My kernel usage is running up to 54%. What could that mean? What could be eating resources on this AIX 6.1.0.0 machine?
1
vote
2answers
117 views

Terminal command (called not from SU) that would restrict process from writting to all directories but one?

We have an app testApp. We have a folder called notRestricted in the directory where we run app from. We want to limit access of the app to file system so that app could write only to that folder (we ...
0
votes
0answers
219 views

keepalive script for application daemons? [duplicate]

Possible Duplicate: Linux: Writing a watchdog to monitor multiple processes I'm looking for a program to keep a set of daemon processes alive. The daemon processes will be for a user ...
3
votes
2answers
2k views

How to find how many cores a process is using?

I have a eight core machine. How can I find out how many cores are used by processes that I see in htop?
13
votes
2answers
15k 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 ...
167
votes
7answers
72k views

When should I not kill -9 a process?

I am always very hesitant to run kill -9, but I see other admins do it almost routinely. I figure there is probably a sensible middle ground, so: When and why should kill -9 be used? When and why ...
6
votes
2answers
267 views

How is a graphical application started from a bash session connected to that bash session?

When I start a graphical application from a terminal running bash, that application is somehow connected to that bash session. For example, when the applications dumps some text it will appear in the ...
5
votes
2answers
22k views

How can I see what processes are running?

I use Ubuntu Server 10.10 and I would like to see what processes are running. I know that PostgreSQL is running on my machine but I can not see it with the top or ps commands, so I assume that they ...
11
votes
9answers
3k 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 ...
6
votes
4answers
5k 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 ...