Error: EMFILE, too many open files about grunt-contrib-copy HOT 39 CLOSED

http://lmgtfy.com/?q=how+to+set+the+ulimit+on+osx+10.9

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Check your ulimit, I know on OSX the default is really low, 256. Run ulimit -n to see the limit and then ulimit -n 10480 to set a higher limit.

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For anyone who gets here via search, just run this:

$ ulimit -n 4096

Edit: Since this comment was posted, the call to launchctl is no longer necessary. I've edited the command above; but for reference, here was the original:

$ launchctl limit maxfiles 4096 8192 && ulimit -n 4096

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The solution of the max file limit is different for macOS Sierra. I wrote up instructions which can resolve the problem.

https://gist.github.com/brennanMKE/f6aa55b452ecda2f4c7a379e21647c88

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what version of grunt? are you using grunt-contrib-watch?

I know there are some issues with open file limits on some operating systems.

I've never personally tried that amount of files but have you tried the copy without watch. You may want to reconsider copying that many files everytime something changes.

cc @shama

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That will not save the limit:
http://superuser.com/questions/261023/how-to-change-default-ulimit-values-in-mac-os-x-10-6

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+1 @sindresorhus

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How can this be changed in mavericks?

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I have a question on SO whcih may help solve this issue without changing the ulimit.

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@ilanbiala - I found this post to be more helpful than the things I found on SO.

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+1 @leek. Many blog posts and SO questions don't mention both. I needed to do both commands, launchctl and then ulimit.

What's odd is that, prior to setting an actual hard limit with launchctl (it was "unlimited" when I ran launchctl limit maxfiles), I wasn't able to successfully change the launchctl soft limit or the ulimit limits until that was done.

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+1 @leek

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Worked for me on Mavericks: http://unix.stackexchange.com/questions/108174/how-to-persist-ulimit-settings-in-osx-mavericks/109488#109488

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@leek's solution works, but it creates a problem with Adobe Illustrator CS6 described at the end of this post.

I'd suggest setting ulimit in your ~/.bash_profile so it doesn't interfere with other programs.

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@leek yours is the only solution that worked. Bless you.

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+1 @leek

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@ivancamilov solution should be preferred (and works for me)

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+1 @leek, thanks!

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I have 200+ posts and @leek's solution fixed it for me too.

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thanks @leek !

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I have a preference towards @ivancamilov 's answer as it compartmentalizes the change better.

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+1 @leek badaboom

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+1 @leek

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+1 @leek

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Did anyone experience any problem after executing @leek 's command?
My computer (yosemite) crashes right after I run it.

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@nnaelle Same issue - Mac Yosemite (10.10.3) hangs after running this command. Did you manage to solve the issue? Cheers.

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@nnaelle and @flatsteve, perhaps you should set a lower limit, like 1024 or so.

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@flatsteve I'm having the same issue after updating to Yosemite (10.10.3)

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@flatsteve no... I kinda-sorta fixed my gruntfile, but my guess is that it gets stucked on an infinite loop, and as my job was not really related to that and that the gruntfile was made by another company, I chose not to touch it too much and just delete some of the lines that were crashing my computer. (basically I had 3 infinite loops, deleted two, my computer wasn't crashing anymore with just 1 infinite loop, it was just getting reaaaaally slow). Also, using grunt watch just once in a while vs. during all the time I was working on my project helped.

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I find a solution in Yosemite (10.10.3) and it works for me. see http://problemsolv.in/fix-mac-os-x-yosemite-ulimit-problem/

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@nnaelle Thanks! I also fixed the issue by modifying my grunt file...
Note to others, if you are seeing this issue it is possible you are watching too many files in your grunt/gulp watch task (make sure you are not being stupid like me and watching the contents of your jspm_packages ((or similar)) directory 😉).

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FYI.

.bash_profile update didn’t help me for 10.10.3, but reinstallation NodeJS from 0.10.35 to 0.12.3 helped me, and error disappear.

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the .bash_profile solution works for me. thx @vizonluo!

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@leek: please edit your answer, this causes an instant system hang on Yosemite for at least myself and several others in this thread.

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+1 @vizonluo

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👍 .bash_profile worked for me too. Thanks, @vizonluo.

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Please be careful with @leek's solution. The limit is way too low for many systems and will cause them to hang until reboot. Do not add these lines to your bash_profile or similar until you know the limit is high enough.

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Thanks @kmoe @msikma - I've edited my comment just in case others come across this thread.

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+1 @alundiak - Reinstalling the latest NodeJS resolved it for me. I'm on Yosemite.

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