hello,
I am using the following codes to study node.js cluster:
const cluster = require('cluster');
const http = require('http');
if (cluster.isMaster) {
const numCPUs = require('os').cpus().length;
console.log(numCPUs);
for (var i = 0; i < numCPUs; i++) {
cluster.fork();
}
cluster.on('online', function(worker) {
console.log('Worker ' + worker.process.pid + ' is online');
});
} else {
// Worker processes have a http server.
http.Server((req, res) => {
res.writeHead(200);
for( var i = 0; i < 10000000000; i++ )
{
var j = i+1000;
}
res.end('process ' + process.pid + ' says hello!');
}).listen(8000);
}
After starting the node.js server, the console output is as below:
Worker 19432 is online
Worker 13232 is online
Worker 14972 is online
Worker 8604 is online
Worker 20920 is online
Worker 13640 is online
Worker 19948 is online
Worker 21460 is online
it means that 8 workers have been started.
I then opened three web browsers to access the *http://localhost:8000* at
the same time, each request took several minutes due to the loop in my
codes. but all results as below:
process 21460 says hello!
according to node.js documents, the requests should be processed using
round-robin order, but why always the last worker process the request?
Could you please help me on this? thanks for your help.
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