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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

79 questions
109
votes
7 answers

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: open files: cannot modify limit: Invalid argument. I…
Chris Poole
  • 1,879
73
votes
5 answers

Cannot Increase open file limit past 4096 (Ubuntu)

I'm on Ubuntu 17.04. Trying to increase the open file limit, and none of the instructions I've found online are working. I can go up to 4096, but can't go past that. $ ulimit -n 1024 $ ulimit -n 4096 $ ulimit -n 4096 That works. This doesn't: $…
mkasberg
  • 2,693
48
votes
4 answers

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 Mac OS X 10.6.7? (Hopefully there's no difference…
Olli
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33
votes
2 answers

modify and apply limits.conf without reboot

I have added a line in /etc/security/limits.conf to increase the number of open files. * hard nofile 4096 root hard nofile 16384 However when I run ulimit -n it says 1024 which is the default value. I did a logout and login but still see 1024.…
mahmood
  • 1,365
28
votes
2 answers

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 something I can do?
Lorenzo Pistone
  • 454
23
votes
3 answers

Open files limit does not work as before in OSX Yosemite

I just updated the Mac OS X to Yosemite, and now some applications do not work (IBM DB2). I know that I need to set the Open Files to 65000, however the command does not work. Andress-MBP:~ root# ulimit -n 12288 Andress-MBP:~ root# ulimit -n…
AngocA
  • 344
22
votes
2 answers

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 (namely ulimit -n 64000), which I set in…
user124114
  • 563
20
votes
3 answers

How do I check the ulimit for another user and change open files?

I have a process running as the gearman user and I want to change open files to avoid getting this nasty error: ERROR 2014-09-12 17:49:14.000000 [ main ] accept(Too many open files) -> libgearman-server/gearmand.cc:788 How can I run ulimit as…
Tony
  • 301
13
votes
2 answers

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 options does ulimit have and what do they mean?
Mnementh
  • 976
9
votes
2 answers

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
  • 201
9
votes
4 answers

How do I increase the max open files in macOS Big Sur?

I have heard sudo launchctl limit maxfiles 64000 unlimited And conf=/etc/sysctl.conf if sudo cat $conf | command rg kern.maxfiles ; then ecerr "kern.maxfiles is already set in $conf" else sudo echo…
HappyFace
  • 1,389
8
votes
1 answer

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) unlimited file size (blocks, -f)…
robertj
  • 383
8
votes
3 answers

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 really slow that I can't even kill the offending…
Lie Ryan
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7
votes
1 answer

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 (blocks, -f) unlimited max locked memory …
Marcel Falliere
  • 173
7
votes
1 answer

Why doesn't ulimit -n work when called inside a script?

This is very odd. I'm trying to set the ulimit to 60000 via my startup.sh: #!/bin/bash ulimit -n 60000 echo "Hello! File Descriptor set" I can execute this with ./startup.sh (755 file permissions) and the echo line is printed, and no errors are…
John Miller
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