Our vision-web and vision-api Express applications currently run in a single thread. In order to scale our application vertically, in order to take advantage of multi-core systems, and provide redundancy in case of failure, we can use the cluster module and spread the load over multiple processes. Lets add the Cluster module to vision-core ./lib/cluster/index.js:
var cluster = require('cluster')
, http = require('http')
, numCPUs = require('os').cpus().length
, logger = require('../logger'),
function Cluster() {}
Cluster.prototype.run = function(module){
if (cluster.isMaster) {
for (var i = 0; i < numCPUs; i++) {
cluster.fork();
}
cluster.on('exit', function(worker, code, signal) {
logger.info('Worker ' + worker.process.pid + ' died'),
});
} else {
require(module);
}
}
module.exports = Cluster;Let's export the cluster module out of vision-core; by adding the following to ./index.js:
module.exports.cluster = require('./lib/cluster'), Let's change our Express application in vision-web and vision-api ./app.js, and add a third option for running our application, that is, running with cluster support:
switch (process.env['NODE_ENV']) {
case 'COVERAGE':
module.exports = require('./lib-cov/express'),
break;
case 'TEST':
module.exports = require('./lib/express'),
break;
default:
var Cluster = require('vision-core').cluster
, cluster = new Cluster();
cluster.run(__dirname + '/lib/express'),
break;
}..................Content has been hidden....................
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