Exec Queue

Safely run exec in a loop.

I ran into an Error: spawn EMFILE when trying to call exec too many times (ie. in a loop). This module safely packages exec so that you may use it in a loop without creating too many child processes.

Usage

npm install exec-queue

var exec = require('exec-queue');
for (var i = 0; i < 100; ++i) {
  exec('ls', function (err, stdout, stderr) {
    console.log(stdout);
  });
}

Try the above example with require('child_process').exec instead. ;)

The current limit is 10 child processes running simultaneously. I did not test the limit (maybe it can be queried by OS). If you need more, please file an issue, as I could add to the API to be able to specify the limit.