Troubleshooting

Too Many Open Files

The lineman run command keeps file handles on all your projects files at once. If you're seeing a message that looks like this:

undefined: [Lundefined:Cundefined] EMFILE, too many open files

Or this

Error: watch Unknown system errno 23

Then it probably means your project has gotten big enough to either run into the user limit on open file descriptors or (in the case of the latter), the hard limit on your operating system's file table .

To resolve this issue, we recommend first increasing the user limit on open files with the ulimit command. You might do this at the beginning of any terminal session or in your ~/.profile dotfile.

ulimit -n 2048