Questions tagged [ulimit]

ulimit provides control over the resources available to the shell and to processes started by it, on systems that allow such control

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Why do we need hard and soft limit in open file count?

I was reading a separate SU question on setting ulimit value and the answer from Gordon mentioned something about hard and soft limit on open file descriptor count. Just curious, why do we need a hard ...
Antony's user avatar
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6 votes
2 answers
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ulimit nofiles and lsof

If I do an lsof | grep user | wc -l I get a number returned in the 25,000 range. If I check ulimit -a user nofiles is set at 1024. Can someone help me to understand the number of open files ...
HayekSplosives's user avatar
1 vote
1 answer
322 views

Best folder configuration for application that opens around 1 million files and ulimit problems

I have an application that creates 16^5 files (1048576). I can configure it to create all them in the same folder or separate them in whatever way I want (having 1, 2, 3 or 4 subfolders on each folder)...
Frederico Schardong's user avatar
1 vote
1 answer
462 views

Why does "ulimit -t 5" have no effect on "less" or "man", but work on "yes"?

If I run $ ulimit -t 5 $ yes then yes gets killed after 5 seconds, but man and less/more don't. Why are those two immune to ulimit?
Grezzo's user avatar
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7 votes
1 answer
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Mac os x 10.7.4 process limit

I have a 709 max user process. I want to double it, or more. First: ulimit > ulimit -a core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited file size ...
Marcel Falliere's user avatar
5 votes
1 answer
15k views

Why does limiting my virtual memory to 512MB with ulimit -v crash the JVM?

I am trying to enforce maximum memory a program can consume on a Unix system. I thought ulimit -v should do the trick. Here is a sample Java program I have written for testing : import java.util.*; ...
Narinder Kumar's user avatar
2 votes
3 answers
15k views

pipe: too many files open renders entire OS completely useless

I'm running Ubuntu 12.04, and I am having a major problem. Two separate times today, one of my open gnome-terminal sessions locked up and printed the error pipe: too many open files I realize that ...
jarvisschultz's user avatar
22 votes
2 answers
16k views

Make ulimits work with start-stop-daemon

I have an init.d script that starts an app using start-stop-daemon --chuid SOME_SYSTEM_USER. That is, the app runs under a different user, not root. Problem is, the app needs special limit settings (...
user124114's user avatar
1 vote
0 answers
461 views

How to find out the available (and used) user resources?

With ulimit, we can find out how many open files, running processes etc. at most the user can have at the same time. My question is: how can we find out how much of these limits are being used and how ...
Eduardo Bezerra's user avatar
5 votes
1 answer
1k views

Locked out of host after reaching some ulimit

So, I have a sudoer account in a remote host, in which I create a process with thousands of threads and sockets. The thing is, if I create too many threads/sockets (not sure which one, it might even ...
Eduardo Bezerra's user avatar
4 votes
2 answers
2k views

daemontools and ulimit

I have a daemontools service whose /service/myservice/run contains: #!/bin/sh exec setuidgid someuser somecommand Now, if I run this as a script directly from a root shell, somecommand will get a ...
oberstet's user avatar
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Adobe flash on Linux 64bit: "Movie not loaded" and maximum stack-size

I was experiencing problems with all flash content (tried Firefox/Chromium/Opera, Ubuntu/Fedora and several Flash releases to no avail). While trying to playback any flash-movie, no video/sound ...
Dragos's user avatar
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1 vote
3 answers
8k views

XAMPP won't start Apache on Mac OS X 10.6.8 Snow Leopard

When I try starting Apache from the XAMPP control panel (Mac OS X 10.6.8 Snow Leopard), I get the following error popup and Apache won’t start: /Applications/XAMPP/xamppfiles/bin/apachectl: line 70: ...
Paul Masri-Stone's user avatar
28 votes
2 answers
32k views

setting ulimit on a running process

I launched a server application and I want to run it for a long time for testing purpose. Unfortunately, I forgot to set before ulimit -c unlimited to catch an eventual crash and inspect it. Is there ...
Lorenzo Pistone's user avatar
9 votes
2 answers
5k views

Why ulimit doesn't work when run with sudo?

Well.. $ ulimit -s 8192 $ sudo ulimit -s 16384 $ ulimit -s 8192 Why does ulimit disrespect me in such a barbaric way?
ntl0ve's user avatar
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4 votes
1 answer
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limits.conf ulimits not being applied to chrooted processes

We allow users to execute scripts on our servers. Our security model involves chrooting them. We want to be able to apply ulimit restrictions to them, and the best way to do it would seem to be in /...
hwjp's user avatar
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4 votes
1 answer
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How can I increase the number of open filehandles in Linux?

I'm trying to increase the number open file handles on a server of mine and the usual places don't seem to be taking effect: root@dev:~# sysctl -p |grep file fs.file-max = 200000 root@dev:~# grep ...
Mark McDonald's user avatar
0 votes
0 answers
3k views

Update ulimit parameters on ubuntu with out restarting

I am trying to update ulimit open files limit from 1024 to 30000. but i need this change with out restarting the server? Even on restarting the server this changes are not reflected followed this ...
kamalakar's user avatar
0 votes
2 answers
6k views

coredumps don't work after enabling them in /etc/security/limits.conf on Debian

I have some init scripts that launch some daemons that I wrote. I want Linux to generate a coredump anytime something crashes. I activated coredumps in /etc/security/limits.conf by adding the next ...
sirlion's user avatar
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5 votes
4 answers
34k views

How to increase stack limit permanently without restarting

I need to increase the default stack size on Linux. As I know there are usually two ways: ulimit -s size /etc/security/limits.conf The ulimit method only works as long as I am logged in. limits....
Simon's user avatar
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8 votes
1 answer
8k views

strange behaviour with ulimit on Mac OS X 10.6

I get some very strange behaviour when working with ulimit. I just open up a new shell Hector:~ robertj$ ulimit -a core file size (blocks, -c) 0 data seg size (kbytes, -d) ...
robertj's user avatar
  • 383
109 votes
7 answers
146k views

Increase the maximum number of open file descriptors in Snow Leopard?

I am trying to do something that requires a large number of file descriptors sudo ulimit -n 12288 is as high as Snow Leopard wants to go; beyond this results in /usr/bin/ulimit: line 4: ulimit: ...
Chris Poole's user avatar
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2 votes
1 answer
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ulimit soft limit for file descriptors - for a non-root user on CentOS 5.6

I am needing to increase the soft limit for "file descriptors", and make it effective for a non-root user (lets say user1). Ran these commands, while logged in as user1: >ulimit -a core ...
user12002221's user avatar
1 vote
2 answers
2k views

how to limit resource in Linux

I've posted a question about this few hours ago on Stack Overflow: Linux bash inline command to execute a program and limit the resource As I know, to limit the resource I can use ulimit command. ...
Bobby Stenly's user avatar
2 votes
1 answer
587 views

Remaining number of open files in Linux

ulimit -a tells me I have a limit of 1024 open files, which is the default on my distro. Is there a way to show how many of these are currently used, or how many are remaining?
Gunther Piez's user avatar
3 votes
2 answers
2k views

Linux: Make "ulimit" limits be cumulative across spawned "subprocesses"

Let's say I have program #1 launching program #2 which is launching program #3. If I call ulimit -t 10 before calling program #1, then EACH program will be alloted 10 seconds of CPU time. Could I ...
user avatar
47 votes
4 answers
62k views

How to change default ulimit values in Mac OS X 10.6?

Mac OS X limits number of processes to 266 and open files to 256. Sometimes this is problem; 256 open files and 266 processes aren't that much. How it's possible to change default ulimit values in ...
Olli's user avatar
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2 votes
2 answers
1k views

ulimit broke my server

I ran "ulimit -v 75" to get SBCL working, and now nothing will run on my server. $ sbcl Killed $ vi Killed $ man ulimit Killed $ ulimit -v 256 -bash: ulimit: virtual memory: cannot modify limit: ...
mcandre's user avatar
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13 votes
2 answers
17k views

What parameters does ulimit have?

I see in examples that the -u option is used with the ulimit command, but I cannot find documentation that says what that option means. man ulimit shows the manual for a system library function. What ...
Mnementh's user avatar
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8 votes
3 answers
21k views

ulimit not limiting memory usage

When writing program, there are times when a runaway program slurps half of my RAM (generally due to practically infinite loops while creating large data structures), and bringing the system to become ...
Lie Ryan's user avatar
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