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Re: Speeding up Flymake in emacs-lisp-mode

From: Stefan Monnier
Subject: Re: Speeding up Flymake in emacs-lisp-mode
Date: Fri, 02 Nov 2018 09:05:06 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux)

> First, I was under the impression that stdin/stdout for emacs was
> not easy.

Usually it's not, but when running in batch mode it's not so bad.

> Glad to hear it isn't, but how do I read from stdin?

async.el does it with (read t), IIRC.

> Are you suggesting I keep a pool of ready to invoke emacsen
> and discard them once they become "dirty"?

I think so, yes.  I'd limit the pool to a single process.
It should be easy to do directly within async.el.
Basically, change async-start so that instead of

    (let ((proc (async-start-process ...)))
      (async--transmit-sexp proc ...))

it does

    (let ((proc async--eager-process))
      (async--transmit-sexp proc ...)
      (setq async--eager-process (async-start-process ...)))

-- Stefan

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