nodejs-集群中的最佳工作程序数

Question

When clustering nodejs on a multi-core processor I usually see examples saying -

const numCPUs = require('os').cpus().length;
for (let i = 0; i < numCPUs; i++) {
    cluster.fork();
  }

My questions are -

1. If a multi-core processor is running a web app with a reverse proxy terminating ssl (cpu intensive), gzipping (cpu intensive) and doing other stuff + there are other servers doing cpu intensive work of main nodejs server, is it still wise to spawn as many workers as the number of cpu cores (for the main nodejs server)?
   

2. What tests should be run to find the optimal number of workers?

Answer 1

1. You can set an affinity for the process to a set of cores .

2. You should have one worker per core available core. By available core I mean a core that will not be heavily utilized by other processes.

To ensure everything is fine, your (CPU load / number of cores) should be below 1.

Try to provision your machines with very few distinct services/processes. This might seem wasteful at first but it helps MMTD and MMTR for incidents by limiting impact for cascading failures.

NOTE: this question is usually better asked at Server Fault , another Stack Exchange site.