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worker-farm

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worker-farm

Distribute processing tasks to child processes with an über-simple API and baked-in durability & custom concurrency options.

  • 1.7.0
  • latest
  • Source
  • npm
  • Socket score

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5.6M
decreased by-6.2%
Maintainers
2
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Created

What is worker-farm?

The worker-farm npm package allows you to distribute processing tasks to multiple child processes, enabling parallel execution and improving performance for CPU-intensive tasks. It is particularly useful for tasks that can be broken down into smaller, independent units of work.

What are worker-farm's main functionalities?

Basic Usage

This code demonstrates the basic usage of worker-farm. It spawns a worker process to handle a task defined in a separate worker file ('./worker'). The result is then logged to the console.

const workerFarm = require('worker-farm');
const workers = workerFarm(require.resolve('./worker'));

workers('someTask', (err, output) => {
  if (err) console.error(err);
  console.log(output);
  workerFarm.end(workers);
});

Handling Multiple Tasks

This code shows how to handle multiple tasks using worker-farm. It iterates over an array of tasks, spawning a worker process for each task and logging the results.

const workerFarm = require('worker-farm');
const workers = workerFarm(require.resolve('./worker'));

const tasks = ['task1', 'task2', 'task3'];

for (let task of tasks) {
  workers(task, (err, output) => {
    if (err) console.error(err);
    console.log(output);
    if (task === tasks[tasks.length - 1]) workerFarm.end(workers);
  });
}

Limiting the Number of Workers

This code demonstrates how to limit the number of concurrent worker processes. In this example, a maximum of 2 workers will be spawned at any given time, even though there are 4 tasks.

const workerFarm = require('worker-farm');
const workers = workerFarm({ maxConcurrentWorkers: 2 }, require.resolve('./worker'));

const tasks = ['task1', 'task2', 'task3', 'task4'];

for (let task of tasks) {
  workers(task, (err, output) => {
    if (err) console.error(err);
    console.log(output);
    if (task === tasks[tasks.length - 1]) workerFarm.end(workers);
  });
}

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Package last updated on 03 May 2019

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