Error: EMFILE: too many open files

[samuelazran]

I'm running jest on a limited linux box on codeanywhere and it gives me the' too many open files error".
When I'm using https://github.com/isaacs/node-graceful-fs it's just consuming all the RAM and not really working. so it get stuck on the "Using Jest CLI v0.5.4 " line.

Here is the command line log from when I'm not using node graceful-fs and running jest:

cabox@box-codeanywhere:~/workspace/vac$ npm test                                                                                                                                                                                                     

> vac@0.0.1 test /home/cabox/workspace/vac                                                                                                                                                                                                           
> jest __tests__/                                                                                                                                                                                                                                    

Using Jest CLI v0.5.4                                                                                                                                                                                                                                
Error reading file: `/home/cabox/workspace/vac/node_modules/webpack-dev-server/package.json`                                                                                                                                                         
/home/cabox/workspace/vac/node_modules/jest-cli/node_modules/node-            haste/lib/loader/ResourceLoader.js:88                                                                                                                                              
      throw err;                                                                                                                                                                                                                                     
            ^                                                                                                                                                                                                                                        
Error: EMFILE: too many open files, open '/home/cabox/workspace/vac/node_modules/webpack-    dev-server/package.json'                                                                                                                                    
  at Error (native)                                                                                                                                                                                                                                  

npm ERR! Test failed.  See above for more details.                                                                                                                                                                                                   

[johannhof]

Did you try using the ulimit command? http://blog.izs.me/post/56827866110/wtf-is-emfile-and-why-does-it-happen-to-me

[amasad]

Please bump your ulimit

[ElOsus]

Is there a solution for Windows? Changing the testDir in the packages.json brakes mocking.

[ggarnier]

I was getting this error in OSX, even with ulimit set to unlimited. After removing node_modules directory, updating npm and running npm install, it started working again.

[jberube]

@ggarnier updating to which npm version?

Still trying to figure it all on Windows.

[ggarnier]

@jberube I just ran npm install npm@latest -g to update to the latest version (currently, 3.5.3)

[FlackMonkey]

@jberube , hi!
Still got issue on Windows (7 x67 sp1).
node : 5.6.0
npm : 3.7.1
jest: 0.8.2
babel-jest: 6.0.1 (enabling/disabling does nothing)

npm test:

> jest

Using Jest CLI v0.8.2, jasmine1
Error reading file: `D:\... \web\node_modules\gulp-less\node_modules\less\node_modules\request\node_modules\hawk\node_mo
D:\ ... \web\node_modules\jest-cli\node_modules\node-haste\lib\loader\ResourceLoader.js:88
      throw err;
      ^

Error: EMFILE: too many open files, open 'D:\ ... \web\node_modules\gulp-less\node_modules\less\node_modules\request\node
    at Error (native)
npm ERR! Test failed.  See above for more details.

UPD

testPathDirs in config solves problem with testing node_modules by default

config.testPathIgnorePatterns [array<string>] 
(default: ["/node_modules/"])

[cpojer]

#599 is going to merge next week and it should resolve this problem too.

[panmona]

I still run into this issue with ulimit=unlimited.

[ashb]

For future: #8258 fixed this for me which was included in Jest 24.7.0 (I was on 24.3.1)

[alflennik]

I saw this issue on Jest 24.9.0, Node 13.6 and with the following ulimits:

$ ulimit -a
-t: cpu time (seconds)              unlimited
-f: file size (blocks)              unlimited
-d: data seg size (kbytes)          unlimited
-s: stack size (kbytes)             8192
-c: core file size (blocks)         0
-v: address space (kbytes)          unlimited
-l: locked-in-memory size (kbytes)  unlimited
-u: processes                       5568
-n: file descriptors                10496

Although the issue is completely intermittent, and might even depend on the terminal window I use (?) for example, I'm seeing it it my VSCode terminal but not my Zsh terminal 🧐

[ZeroDarkThirty]

I was getting this error in OSX, even with ulimit set to unlimited. After removing node_modules directory, updating npm and running npm install, it started working again.

This worked for me, although I had to run sudo npm install. Otherwise I was getting errors during the installation.

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