> Interesting! What i know is we just can run context one by one in an 
isolate per thread. For example

Yes, it's pretty exciting. We have already implemented such a
mechanism for Lua and it works perfectly with the minimum overhead
, so we want to apply it to JavaScript.

As to the vm module, I'm wondering whether the contexts will be
switched back and forth if I call `vm.runInNewContext` multiple
times, where I write some async code(the timeout argument should
only restrict the on-cpu time, including promise callbacks, I guess).

> Maybe you can read the source code of `node_contextify.cc` and `vm.js` in 
Node.js. Hope it will be helpful to you.

I haven't used the vm module before so those are my guess.
But anyway, I'll read the code for details. Thanks!

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