节点集群工作人员内存使用情况

Question

有谁知道是否有一种独立于平台的方法来获取工作人员的内存使用情况？我希望它会像这样工作：

console.log('App process memoryUsage: ',process.memoryUsage());
cluster.on('online',function(worker){    // doesn't work! 
  console.log('Workers memory usage: ',worker.process.memoryUsage());  
});

但工人进程没有办法memoryUsage()。

是否有一个没有实施的正当理由？

top -pid 1234实现这一点的唯一想法是在 unix (macosx) 或Linux上工作top -p 1234。并通过 切换process.plattform。

Answer 1

是的，确实您无法memoryUsage从工人的进程属性中获取。我不确定为什么它没有实现，但你可以用这种方法实现相同的目的：

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()
      });
    }
  });
}

8核系统上的输出：

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$