From: Stephen Leake <stephen_leake@stephe-leake.org>
To: Eli Zaretskii <eliz@gnu.org>
Cc: 18626@debbugs.gnu.org
Subject: bug#18626: 24.3.94; communication with subprocess is slow
Date: Sun, 05 Oct 2014 08:20:47 -0500 [thread overview]
Message-ID: <858ukuejps.fsf@stephe-leake.org> (raw)
In-Reply-To: <83oatsgswd.fsf@gnu.org> (Eli Zaretskii's message of "Sat, 04 Oct 2014 11:07:14 +0300")
Eli Zaretskii <eliz@gnu.org> writes:
> Can you present similar timings from some Posix platform for
> comparison?
On Debian wheezy, with emacs 24.3.94:
$ cd /tmp
$ time cat < /home/Projects/emacs/emacs-24.3.94/src/xdisp.c > xdisp.c
real 0m0.007s
user 0m0.000s
sys 0m0.004s
(find-file "emacs-24.3.94/src/xdisp.c")
(pipe-torture "cat.exe")
1.556597
much faster than Windows, but still slow relative to plain file IO.
(pipe-torture "debug.exe" "4096")
This dies, because "debug.exe" exits early. It turns out that Emacs is
sending one line of the buffer at a time. I have not yet tried to figure
out why that doesn't happen on Windows.
(find-file "emacs-24.3.94/src/xdisp.c")
(pipe-torture-read "/Projects/emacs/emacs-24.3.94/src/xdisp.c")
0.077341
much faster than Windows, 10 times slower than file IO.
>> Doing (setq process-adaptive-read-buffering nil) did not change the
>> timing.
>
> AFAIK, this variable only matters for reading the subprocess output.
> Since you didn't present the results for that, there's no evidence yet
> which would support this conclusion.
Right; process-adaptive-read-buffering should only affect
pipe-torture-read.
On Windows:
(find-file "emacs-24.3.94/src/xdisp.c")
(pipe-torture-read "/Projects/emacs/emacs-24.3.94/src/xdisp.c")
process-adaptive-read-buffering t:
11.997684
process-adaptive-read-buffering nil:
12.012685
process-adaptive-read-buffering has no effect.
Simililary, on Debian, process-adaptive-read-buffering has no effect.
--
-- Stephe
next prev parent reply other threads:[~2014-10-05 13:20 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-04 6:47 bug#18626: 24.3.94; communication with subprocess is slow stephen_leake
2014-10-04 8:07 ` Eli Zaretskii
2014-10-05 13:20 ` Stephen Leake [this message]
2014-10-05 13:41 ` Stephen Leake
2014-10-05 14:43 ` Eli Zaretskii
2014-10-05 18:19 ` Stephen Leake
2014-10-04 8:11 ` Stephen Leake
2014-10-04 8:32 ` Eli Zaretskii
2014-10-04 22:29 ` Stefan Monnier
2014-10-05 2:46 ` Eli Zaretskii
2014-10-05 13:34 ` Stephen Leake
2014-10-05 14:40 ` Eli Zaretskii
2014-10-05 18:25 ` Stephen Leake
2014-10-05 19:04 ` Eli Zaretskii
2014-10-08 13:29 ` Stephen Leake
2014-10-08 13:53 ` Eli Zaretskii
2014-10-10 8:07 ` Stephen Leake
2014-10-10 9:13 ` Eli Zaretskii
2014-10-10 8:47 ` Stephen Leake
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