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Refactor spawnWorkers (#3338)

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Aya Morisawa 2018-11-20 12:25:58 +09:00 • committed by GitHub
parent 4a77548672
commit 168db6891f
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1 changed files with 13 additions and 23 deletions
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36
src/index.ts
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@ -219,31 +219,21 @@ function checkMongoDb(config: Config) {
});
}
function spawnWorkers(limit: number) {
Logger.info('Starting workers...');
async function spawnWorkers(limit: number) {
const workers = Math.min(limit, os.cpus().length);
Logger.info(`Starting ${workers} worker${workers === 1 ? '' : 's'}...`);
await Promise.all([...Array(workers)].map(spawnWorker));
Logger.succ('All workers started');
}
function spawnWorker(): Promise<void> {
return new Promise(res => {
// Count the machine's CPUs
const cpuCount = os.cpus().length;
const count = limit || cpuCount;
let started = 0;
// Create a worker for each CPU
for (let i = 0; i < count; i++) {
const worker = cluster.fork();
worker.on('message', message => {
if (message !== 'ready') return;
started++;
// When all workers started
if (started == count) {
Logger.succ('All workers started');
res();
}
});
}
const worker = cluster.fork();
worker.on('message', message => {
if (message !== 'ready') return;
Logger.succ('A worker started');
res();
});
});
}