判断CPU in use a process nodejs

Question

有没有办法获取哪些 CPU 正在执行子进程。我有 8 个 CPU。所以父代码启动了8个子进程。这是节点代码：

// parent.js
var child_process = require('child_process');

var numchild  = require('os').cpus().length;
var done      = 0;

for (var i = 0; i < numchild; i++){
  var child = child_process.fork('./child');
  child.send((i + 1) * 1000);
  child.on('message', function(message) {
    console.log('[parent] received message from child:', message);
    done++;
    if (done === numchild) {
      console.log('[parent] received all results');
    }
  });
}


// child.js
process.on('message', function(message) {
  console.log('[child] received message from server:', message);

  setTimeout(function() {
    process.send({
      child   : process.pid,
      result  : message + 1
    });
    process.disconnect();
  }, 10000); 

});

Answer 1

直接来自 child 对象，虽然 child_process 没有。

但是您可以使用其 PID - child.pid - 并从节点执行例如 UNIX ps -p <PID> -o psr 命令来解析其响应。 PSR 是在特定进程中使用的处理器数。

为此，您可以根据需要调整 node.js shell command execution 中建议的解决方案：

function cmd_exec(cmd, args, cb_stdout, cb_end) {
  var spawn = require('child_process').spawn,
    child = spawn(cmd, args),
    me = this;
  me.exit = 0;  // Send a cb to set 1 when cmd exits
  child.stdout.on('data', function (data) { cb_stdout(me, data) });
  child.stdout.on('end', function () { cb_end(me) });
}
foo = new cmd_exec('netstat', ['-rn'], 
  function (me, data) {me.stdout += data.toString();},
  function (me) {me.exit = 1;}
);
function log_console() {
  console.log(foo.stdout);
}
setTimeout(
  // wait 0.25 seconds and print the output
  log_console,
250);

判断CPU in use a process nodejs

Determine the CPU in use of a process nodejs

macos

child-process

node.js