问题
Does anyone know if there is a platform independent way to get memory usage of a worker? I would expect it would work like this:
console.log('App process memoryUsage: ',process.memoryUsage());
cluster.on('online',function(worker){ // doesn't work!
console.log('Workers memory usage: ',worker.process.memoryUsage());
});
But the workers process hasn't the method memoryUsage()
.
Is there a valid reason this isn't implemented ?
The only idea to realize this is to work with unix top -pid 1234
(macosx) or top -p 1234
on linux. And switching by process.plattform
.
回答1:
Yes indeed you cannot get memoryUsage
from worker's process property. I am not sure why it's not implemented, but you can achieve the same with this approach:
var cluster = require('cluster');
var numCPUs = require('os').cpus().length;
if (cluster.isMaster) {
for (var i = 0; i < numCPUs; i++) {
cluster.fork();
}
cluster.on('exit', function(worker, code, signal) {
console.log('worker ' + worker.process.pid + ' died');
});
cluster.on('online', function(worker, code, signal) {
worker.send('memoryUsage');
worker.on('message', function(dd) {
if (dd.event == 'memoryUsage') {
console.log("Worker with ID: %d consumes %imb of memory", worker.id, dd.data.heapTotal / 1024 / 1024);
}
});
});
console.log("Master consumes %imb of memory", process.memoryUsage().heapTotal / 1024 / 1024);
} else {
if (cluster.worker.id == 1) {
a = [];
for (var i = 0; i < 1000000; i++) {
//just to see the difference in memory usage.
a.push(Number.MAX_SAFE_INTEGER);
};
}
process.on('message', function(msg) {
if (msg == 'memoryUsage') {
process.send({
event: msg,
data: process.memoryUsage()
});
}
});
}
Output on 8-core system:
user$ node ClusterTest.js
Master consumes 6mb of memory
Worker with ID: 2 consumes 5mb of memory
Worker with ID: 6 consumes 5mb of memory
Worker with ID: 3 consumes 5mb of memory
Worker with ID: 4 consumes 5mb of memory
Worker with ID: 7 consumes 5mb of memory
Worker with ID: 5 consumes 5mb of memory
Worker with ID: 8 consumes 5mb of memory
Worker with ID: 1 consumes 39mb of memory
^C
user$
来源:https://stackoverflow.com/questions/31168351/node-cluster-workers-memoryusage