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Use PARCEL_WORKERS environment variable #589

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merged 2 commits into from
Jan 20, 2018
Merged

Use PARCEL_WORKERS environment variable #589

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230b266
Use PARCEL_WORKERS environment variable
shawwn Jan 19, 2018
95d214f
Update WorkerFarm.js
devongovett Jan 20, 2018
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6 changes: 6 additions & 0 deletions CONTRIBUTING.md
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Expand Up @@ -35,6 +35,12 @@ yarn test
[node]: https://nodejs.org/
[yarn]: https://yarnpkg.com/

## Environment variables

You can set `PARCEL_WORKERS` to the number of worker processes to spawn.

`PARCEL_WORKERS=0` is handy for debugging, because that will cause all code to be run on the main thread. This allows you to place breakpoints in Asset code, for example.

## Financial contributions

We also welcome financial contributions in full transparency on our [open collective](https://opencollective.com/parcel).
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8 changes: 7 additions & 1 deletion src/WorkerFarm.js
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Expand Up @@ -45,7 +45,9 @@ class WorkerFarm extends Farm {
}

await Promise.all(promises);
this.started = true;
if (this.options.maxConcurrentWorkers > 0) {
this.started = true;
}
}

receive(data) {
Expand Down Expand Up @@ -97,6 +99,10 @@ for (let key in EventEmitter.prototype) {
}

function getNumWorkers() {
if (process.env.PARCEL_WORKERS) {
return parseInt(process.env.PARCEL_WORKERS, 10);
}

let cores;
try {
cores = require('physical-cpu-count');
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