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Re: M-x compile output sometimes delayed
From: |
Richard Stallman |
Subject: |
Re: M-x compile output sometimes delayed |
Date: |
Fri, 5 Apr 2002 12:05:47 -0700 (MST) |
I do M-x compile. I see the output in fits and starts, not every 4
seconds.
That certainly should not happen. It does not fail for me, though.
Can anyone reproduce this and debug it?
Eli wrote:
I think you forget about I/O buffering. Emacs runs subordinate processes
via a pipe, and pipes are buffered by the system.
Sure, but unless Emacs is busy, that should only result in a very
short delay before Emacs wakes up, reads the data, puts it in the
buffer, and displays it. If Emacs fails to do this promptly,
that is indeed a bug in Emacs.
In addition, Emacs only checks whether there was input from a subprocess
when it's not busy doing other things, so that could account for additional
delays.
That is true, but I get the impression that Emacs was not doing any
other computation in that test case. He said the processor was 99%
idle, which it would not have been if Emacs had been running the whole
time.