NodeJS C++ native module: Create designated thread pool

Question

for a application I am currently developing, I need to start instances of a shared library in parallel.

As I want to have fine-grained control over the amount of parallel instances (-license of library restricts amount of parallelism to a fixed amount of threads), I am wondering if there's a easy way to create&maintain a own thread pool in the native module?

Thanks!

Answer 1

Basically we must set the UV_THREADPOOL_SIZE environment variable before the thread pool is created.

This can be done in three ways:

1. Putting this line in your .bashrc file will affect all the opened node processes under that user

   export UV_THREADPOOL_SIZE=10
   

2. Set it before the process is open

   UV_THREADPOOL_SIZE=10 node myscript.js
   

3. Set it inside the javascript, in the first line:

   process.env.UV_THREADPOOL_SIZE = 10;