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bug#18626: 24.3.94; communication with subprocess is slow
From: |
Stephen Leake |
Subject: |
bug#18626: 24.3.94; communication with subprocess is slow |
Date: |
Fri, 10 Oct 2014 03:47:12 -0500 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.3 (windows-nt) |
There remains a problem on Linux; with either a pty or a pipe, there is
a default internal buffer of 2^16 bytes, which means we encounter the
send_process EWOULDBLOCK delay of 20 ms for every 2^16 bytes; that takes
0.3 seconds for 1 megabyte:
(find-file "xdisp.c")
(pipe-torture
"/home/Projects/org.emacs.ada-mode.stephe-1/build/wisi/debug_counted"
"974233" "974233")
send time 0.291322
The pipe is created by emacs_pipe in sysdep.c; there is no parameter for
the internal buffer size.
The pty is created by allocate_pty in process.c; I don't see a size
parameter there, but there are lots of macros.
However, changing the value for the nsecs parameter in the call to
wait_reading_process_output in send_process at process.c:4282 has no
effect, so the 20 ms delay is coming from something else.
--
-- Stephe
- bug#18626: 24.3.94; communication with subprocess is slow, (continued)
- bug#18626: 24.3.94; communication with subprocess is slow, Stephen Leake, 2014/10/05
- bug#18626: 24.3.94; communication with subprocess is slow, Eli Zaretskii, 2014/10/05
- bug#18626: 24.3.94; communication with subprocess is slow, Stephen Leake, 2014/10/05
- bug#18626: 24.3.94; communication with subprocess is slow, Eli Zaretskii, 2014/10/05
- bug#18626: 24.3.94; communication with subprocess is slow, Stephen Leake, 2014/10/08
- bug#18626: 24.3.94; communication with subprocess is slow, Eli Zaretskii, 2014/10/08
- bug#18626: 24.3.94; communication with subprocess is slow, Stephen Leake, 2014/10/10
- bug#18626: 24.3.94; communication with subprocess is slow, Eli Zaretskii, 2014/10/10
- bug#18626: 24.3.94; communication with subprocess is slow,
Stephen Leake <=