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


From: Lars Hamren
Subject: bug#7069: Compilation from within emacs becomes slower and slower until Emacs is restarted
Date: Sun, 19 Sep 2010 02:38:00 +0200
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.11) Gecko/20100713 Thunderbird/3.0.6

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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