gulp-multi-process

Run gulp tasks in separate CPU processes

Install

npm install gulp-multi-process --save-dev

Usage

gulpfile.js

var gulp = require('gulp');
var gulpMultiProcess = require('gulp-multi-process');

gulp.task('task1', function(cb) {
  // example
});

gulp.task('task2', function(cb) {
  // example
});

gulp.task('multi', function(cb) {
  // task1 and task2 will run in different processes
  return gulpMultiProcess(['task1', 'task2'], cb);
});

gulp.task('multi', function(cb) {
  // tasks will be spun up utilizing 1/2 of available cores
  return gulpMultiProcess(['task1', 'task2', 'task3', 'task4'], cb, 0.5);
});

gulp.task('multi', function(cb) {
  // tasks will be spun up utilizing all available cores
  return gulpMultiProcess(['task1', 'task2', 'task3', 'task4'], cb, 1.0);
});

Warning

Run task in multiple processes is not always good for performance because spawn a different node processes is slow. It also depends on how long time it takes to require your gulpfile. Keep in mind that you can pass a ratio (i.e 0.5) as a third parameter to gulpMultiProcess fn in order to get optimal preformance. This will launch one process per core (adjusted by the ratio), and if there will be more of them than the number of usable cores on your machine it will put others into queue. When one process will finish its operation, the next one will be on launched. The number of sub process can be specified using an environment variable called GULP_MULTI_MAX_PROC - otherwise os.cpus() is used to set the number of sub processes. Whichever value is used it is scaled using the ratio.