48 lines
1.4 KiB
JavaScript
Executable File
48 lines
1.4 KiB
JavaScript
Executable File
#!/usr/bin/env node
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/**
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* A very basic cluster-based server runner. Restarts failed workers, but does
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* not much else right now.
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*/
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var cluster = require('cluster');
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if (cluster.isMaster) {
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// Start a few more workers than there are cpus visible to the OS, so that we
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// get some degree of parallelism even on single-core systems. A single
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// long-running request would otherwise hold up all concurrent short requests.
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var numCPUs = require('os').cpus().length + 3;
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// Fork workers.
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for (var i = 0; i < numCPUs; i++) {
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cluster.fork();
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}
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cluster.on('exit', function(worker) {
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if (!worker.suicide) {
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var exitCode = worker.process.exitCode;
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console.log('worker', worker.process.pid,
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'died ('+exitCode+'), restarting.');
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cluster.fork();
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}
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});
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process.on('SIGTERM', function() {
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console.log('master shutting down, killing workers');
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var workers = cluster.workers;
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Object.keys(workers).forEach(function(id) {
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console.log('Killing worker ' + id);
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workers[id].destroy();
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});
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console.log('Done killing workers, bye');
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process.exit(1);
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} );
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} else {
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var mathoidWorker = require('./mathoid-worker.js');
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process.on('SIGTERM', function() {
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console.log('Worker shutting down');
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process.exit(1);
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});
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// when running on appfog.com the listen port for the app
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// is passed in an environment variable. Most users can ignore this!
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mathoidWorker.listen(process.env.VCAP_APP_PORT || 8010);
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}
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