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Re: emacs communication with subprocess is slow

From: Stephen Leake
Subject: Re: emacs communication with subprocess is slow
Date: Sat, 04 Oct 2014 01:51:26 -0500
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (windows-nt)

Eli Zaretskii <address@hidden> writes:

> Sorry, I don't understand: Emacs 24.3 would simply deaqdlock in this
> situation, as we have established in bug #18420.  But you say that not
> only does it not hang, it is even faster.  What am I missing?
> And what exactly does "large enough" mean here?  What sizes are we
> talking about?
> Also, can you quantify the delays?

I submitted bug 18626; see details there.

>> I can use a large buffer in my subprocess for read as a workaround, but
>> I have no control over the read buffer in Emacs (perhaps that could be
>> added?).
> You could try playing with 2 parameters that currently are fixed: the
> size of the pipe buffer (set by pipe2 in w32.c, where we use 0 which
> AFAIK defaults to 4KB); and the delay used by send_process in
> process.c when it gets EAGAIN/EWOULDBLOCK from the 'write' call
> (currently 20 milliseconds).

I'll try this and reply in the bug.

-- Stephe

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