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Package: konqueror
Version: 4:4.2.2-1
When I tried to open a web page in the Konqueror, it often stopped working for
a while (didn't respond to actions, redraw window, etc). The same happened
sometimes when I was closing the browser. And the overall performance was very
low.
I strace'd an instance of the browser to find out what did it wait for:
ximaera@agavrichen2#9:~$ type watch-trace-for-waits
watch-trace-for-waits is a function
watch-trace-for-waits ()
{
local DELAY=1 PRINTED=false LN=$(cat "$1" | wc -l);
local SECCNT=$DELAY;
while true; do
if ! {
ps -ef | grep -q "$2"
}; then
$PRINTED && echo $SECCNT;
return;
fi;
local NEWLN=$(cat "$1" | wc -l);
if [ "$NEWLN" == "$LN" ]; then
if $PRINTED; then
SECCNT=$(($SECCNT+$DELAY));
else
echo -n "Trace line #"$(($LN+1))": ";
PRINTED=true;
fi;
else
if $PRINTED; then
echo $SECCNT" seconds";
PRINTED=false;
SECCNT=$DELAY;
else
LN="$NEWLN";
fi;
fi;
sleep $DELAY;
done
}
ximaera@agavrichen2#9:~$ strace konqueror 'http://google.com' 2>konq.strace &
time watch-trace-for-waits konq.strace $!
[1] 30964
Trace line #13901: 14 seconds
Trace line #15903: 13 seconds
Trace line #16708: 13 seconds
Trace line #17311: 13 seconds
Trace line #18362: 13 seconds
Trace line #18848: 2 seconds
Trace line #18856: 9 seconds
Trace line #19860: 13 seconds
<-- Soon after that, the page had been loaded
<-- and I tried to close the window
Trace line #21607: 4 seconds
Trace line #21615: 5 seconds
Trace line #21638: [1]+ Done strace konqueror
'http://google.com' 2> konq.strace
14 seconds
Trace line #23669: 2
real 2m25.351s
user 0m2.432s
sys 0m3.660s
ximaera@agavrichen2#9:~$ cat konq.strace | lines 13901 15903 16708 17311 18362
18848 18856 19860 21607 21615 21638
13901: poll([{fd=8, events=POLLIN}], 1, 25000) = 1 ([{fd=8, revents=POLLIN}])
15903: poll([{fd=8, events=POLLIN}], 1, 25000) = 1 ([{fd=8, revents=POLLIN}])
16708: poll([{fd=8, events=POLLIN}], 1, 25000) = 1 ([{fd=8, revents=POLLIN}])
17311: poll([{fd=8, events=POLLIN}], 1, 25000) = 1 ([{fd=8, revents=POLLIN}])
18362: poll([{fd=8, events=POLLIN}], 1, 25000) = 1 ([{fd=8, revents=POLLIN}])
18848: poll([{fd=8, events=POLLIN}], 1, 25000) = 1 ([{fd=8, revents=POLLIN}])
18856: poll([{fd=8, events=POLLIN}], 1, 20512) = 1 ([{fd=8, revents=POLLIN}])
19860: poll([{fd=8, events=POLLIN}], 1, 25000) = 1 ([{fd=8, revents=POLLIN}])
21607: poll([{fd=8, events=POLLIN}], 1, 25000) = 1 ([{fd=8, revents=POLLIN}])
21615: poll([{fd=8, events=POLLIN}], 1, 19156) = 1 ([{fd=8, revents=POLLIN}])
21638: poll([{fd=8, events=POLLIN}], 1, 25000) = 1 ([{fd=8, revents=POLLIN}])
ximaera@agavrichen2#9:~$ head -13901 konq.strace | egrep -n '^open.* = 8$' |
tail -1
2571:open("/usr/lib/libdbus-1.so.3", O_RDONLY) = 8
ximaera@agavrichen2#9:~$ head -21638 konq.strace | egrep -n '^open.* = 8$' |
tail -1
2571:open("/usr/lib/libdbus-1.so.3", O_RDONLY) = 8
ximaera@agavrichen2#9:~$
As you see, it took more than two minutes to show up the Google's main page,
making web-surfing in Konqueror impossible. One and a half minute of these two
was spent waiting for libdbus.
After tracing Konqueror again with the strace string size set to a bigger
value than the default one I've found that before poll()ing the DBus, the
browser sends it a message containing words "modules/proxyscout:
writev(8,
[{"l\1\0\1\0\0\0I\0\0\0w\0\0\0\1\1o\0\23\0\0\0/modules/proxyscout\0\0\0\0\0\6\1s\0\f\0\0\0org.kde.kded\0\0\0\0\2\1s\0\27\0\0\0org.kde.KPAC.ProxyScout\0\3\1s\0\v\0\0\0proxyForUrl\0\0\0\0\0\10\1g\0\1s\0\0"...,
136}, {"6\0\0\0http://www.google.ru/intl/en_com/images/logo_plain.png\0";...,
59 }], 2) = 195
gettimeofday({1247848875, 377033}, NULL) = 0
poll([{fd=8, events=POLLIN}], 1, 25000) = 1 ([{fd=8, revents=POLLIN}])
I'm using proxy server autoconfiguration. Seems like Konqueror is not caching
the autoconfiguration and every time you need to view a page, it sends a new
query to the proxy configuration URL. If this is intended, it is a -- really
-- bad idea. Two or five minutes per any single web page exceed much anyone's
expectations.
I'm using Debian GNU/Linux Testing/Squeeze:
- kernel 2.6.26-2-686 (2.6.26-17)
- libc6 2.9-12
--
Artyom Gavrichenkov | Engineer, HP Global Delivery Russia Center | Mailto:
ximaera@hp.com | Tel. No: +7 916 515 49 58
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