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bug#7069: Compilation from within emacs becomes slower and slower until


From: Jan Djärv
Subject: bug#7069: Compilation from within emacs becomes slower and slower until Emacs is restarted
Date: Wed, 22 Sep 2010 08:43:50 +0200
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.12) Gecko/20100915 Thunderbird/3.0.8

I can't repeat this. The "Much waiting here" you mark below is Emacs waiting for your X server to send something, so it doesn't say anything. As there is only one fd in the select, the compilation must have finished before this.

For an strace to be useful, you need to see what emacs reads from the compilation and when and compare this to the "real" output. If there is a notable delay for when Emacs reads from the compilation process, there might be a problem. For now it just looks like your X server has some bug or is busy doing something else, so it doesn't have time to update Emacs windows.

You also failed to say if this happens with emacs -Q. Is Emacs stuck when this happens or can you edit in other buffers?

Please use M-x report-emacs-bug next time to include relevant information about your Emacs.

        Jan D.

2010-09-19 02:38, Lars Hamren skrev:
The first few compiles, using "compile" to invode  GNU make,
from within Emacs, run at "command-line speed" but then the overall
time increases. The first 10 compiles are OK, but after about 20 compiles,
a compilation that "time make -k" reports as taking

real 0m0.127s
user 0m0.100s
sys 0m0.016s

takes more than five seconds. Then I give up and restart Emacs, and
everything is fine for another 10 compiles. And so on.

Here is some output from "strace emacs"

socket(PF_FILE, SOCK_STREAM, 0) = 3 <0.000016>
connect(3, {sa_family=AF_FILE, path=@"/tmp/.X11-unix/X0"}, 20) = 0
<0.000015>

Here I attach strace to a running emacs just before i start compilation
and detach as soon as the compilation is done. The first few selects are
probably from before the time I press enter to execute the compile command.

select(4, [3], NULL, NULL, {0, 297904}) = 0 (Timeout) <0.298232>
select(4, [3], NULL, NULL, {0, 498307}) = 0 (Timeout) <0.498832>
select(4, [3], NULL, NULL, {0, 498294}) = 0 (Timeout) <0.498820>
select(4, [3], NULL, NULL, {0, 498292}) = 0 (Timeout) <0.498818>
select(4, [3], NULL, NULL, {0, 498250}) = 0 (Timeout) <0.498776>
select(4, [3], NULL, NULL, {0, 498299}) = 1 (in [3], left {0, 444141})
<0.054181>
select(4, [3], NULL, NULL, {0, 441524}) = 1 (in [3], left {0, 320780})
<0.120760>
select(4, [3], NULL, NULL, {0, 312270}) = 1 (in [3], left {0, 311270})
<0.001084>
select(4, [3], NULL, NULL, {0, 282200}) = 0 (Timeout) <0.282507>
select(4, [3], NULL, NULL, {0, 498525}) = 1 (in [3], left {0, 21105})
<0.477438>
select(4, [3], NULL, NULL, {0, 499408}) = 0 (Timeout) <0.499936>
select(4, [3], NULL, NULL, {0, 498927}) = 1 (in [3], left {0, 272045})
<0.226897>
select(5, [3 4], NULL, NULL, {0, 499323}) = 1 (in [4], left {0, 479747})
<0.019591>
select(5, [3], NULL, NULL, {0, 20000}) = 0 (Timeout) <0.020070>
select(5, [3 4], NULL, NULL, {0, 442695}) = 1 (in [4], left {0, 442690})
<0.000016>
select(5, [3], NULL, NULL, {0, 0}) = 0 (Timeout) <0.000008>
select(4, [3], NULL, NULL, {0, 494042}) = 0 (Timeout) <0.494564> <----
Much waiting here
select(4, [3], NULL, NULL, {0, 498322}) = 0 (Timeout) <0.498847>
select(4, [3], NULL, NULL, {0, 498336}) = 0 (Timeout) <0.498862>
select(4, [3], NULL, NULL, {0, 498261}) = 0 (Timeout) <0.498784>
select(4, [3], NULL, NULL, {0, 498320}) = 0 (Timeout) <0.498847>
select(4, [3], NULL, NULL, {0, 498260}) = 0 (Timeout) <0.498786>
select(4, [3], NULL, NULL, {0, 498325}) = 0 (Timeout) <0.498853>
select(4, [3], NULL, NULL, {0, 498215}) = 0 (Timeout) <0.498737>
select(4, [3], NULL, NULL, {0, 498057}) = 1 (in [3], left {0, 445670})
<0.052400>
select(4, [3], NULL, NULL, {0, 445001}) = 1 (in [3], left {0, 349721})
<0.095295>
select(4, [3], NULL, NULL, {0, 347501}) = 1 (in [3], left {0, 345858})
<0.001656>
select(4, [3], NULL, NULL, {0, 345151}) = 1 (in [3], left {0, 342229})
<0.002978>
select(4, [3], NULL, NULL, {0, 340611}) = 1 (in [3], left {0, 268540})
<0.072088>
select(4, [3], NULL, NULL, {0, 259972}) = 1 (in [3], left {0, 259075})
<0.000975>
select(4, [3], NULL, NULL, {0, 228314}) = 0 (Timeout) <0.228570>
select(4, [3], NULL, NULL, {0, 498550} <unfinished ...>

Environment

Ubuntu 10.04 (and earlier, on 9.04)
Linux: 2.6.32-24-generic
Emacs 23.1.2 (my own emacs build)
Emacs 22.2.1 (Ubuntu package)

Googling, I can find nothing about this problem.

/Lars
-------------------------------------------------------------------
Lars Hamrén Tel...: +46(46)189090
Svensk Datorutveckling e-post: address@hidden
Vadmöllan 211 WWW...: www.sdu.se
S-225 94 Lund
Sweden








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