** Branch linked: lp:ubuntu/lxdm
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Title:
lxdm-greeter-gtk excessive CPU usage
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This bug was fixed in the package lxdm - 0.3.0-0ubuntu5
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lxdm (0.3.0-0ubuntu5) natty; urgency=low
* debian/patches/90_simple_expose.patch
- From upstream, rework the expose-event callback which have a high CPU
usage (LP: #733912)
* debian/patches/20_disable_resize_grip.
Thanks Steve.
I'll upload upstream fix, and assume the other part of the performance problem
is fixed in newer versions of gtk + cairo, available in Natty.
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3% CU usage with ppa10 version down from 27% with ppa8 version.
1 GHz Duron and ATI Rage 128.
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Title:
lxdm-greeter-gtk excessive CPU usage
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Yes, difficult to say where the bug is in the stack.
Steve, could you test the last version in my PPA and see if the CPU
usage is still high on Natty ?
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I'll test ppa8 version a bit later and get back with results, but I'm
afraid it won't help.
I've tried to implement fix proposed by upstream myself based on ppa3
version (using gdk_cairo_rectangle + cairo_fill). Looks like it is cairo
performance problem. The following implementation of on_expose
Upstream proposed another fix for this problem. Could you test version
lxdm - 0.3.0-0ubuntu5~ppa8 in my PPA ?
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Title:
lxdm-greeter-gtk excessive C
Version lxdm_0.3.0-0ubuntu5~ppa5 does not use CPU, but now it also
ignores any background image settings, as if bg= was not set at all.
Probably on_expose should be called at least once.
Also, there is on_screen_size_changed, function in greeter.c. I don't
know what it is, but we probably should r
Thanks for the testing. Unfortunatly, I was not enable to do a better solution
to improve the drawing. I think the better solution is just to remove this
on_expose function. I'm not even sure it's really necessary because the
background should be managed by the theme.
I'll publish another packag
PPA version lxdm_0.3.0-0ubuntu5~ppa3 still uses about 20-30% of CPU on
my box.
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Title:
lxdm-greeter-gtk excessive CPU usage
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Could you test with the lxdm package in my PPA :
https://launchpad.net/~gilir/+archive/lubuntu ?
There are still flickering in natty, but it seems to be another problem.
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Thank your for the analysis. Deconnecting the on_expose function to
expose-event fix the flickering and I suppose the CPU usage. IMO,
background need only to be draw on creation of the window, it should not
change during teh "life" of the window. I'll try to make a proper patch.
** Changed in: lxd
Both versions are affected because on_expose function was not changed.
If you check serc/greeter.c::on_expose, you will see that this function
redraws entire screen on each call:
if( bg_img )
{
cairo_matrix_t matrix;
double x = 0, y = 0, sx, sy;
cairo_get_matrix(cr,
High cpu usage still occurring in Natty with lxdm 0.3.0. 60% cpu with a
2 GHz P4.
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Title:
lxdm-greeter-gtk excessive CPU usage
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Thank you for your bug report. Could you try with Ubuntu or Lubuntu Natty
(11.04). There was some fixes regarding lxdm and the background rendering in
lxdm 0.3.0.
You can also test lxdm 0.3.0 in LXDE PPA :
https://launchpad.net/~lxde/+archive/ppa
** Changed in: lxdm (Ubuntu)
Status: New
I'm sorry, forgot to mention. I've found reported issue in Maverick
package version lxdm-0.2.0-0ubuntu3.
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Title:
lxdm-greeter-gtk excessive CPU us
** Attachment added: "callgrind-without-bg.txt"
https://bugs.launchpad.net/ubuntu/+source/lxdm/+bug/733912/+attachment/1903965/+files/callgrind-without-bg.txt
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** Attachment added: "callgrind-with-bg.txt"
https://bugs.launchpad.net/ubuntu/+source/lxdm/+bug/733912/+attachment/1903964/+files/callgrind-with-bg.txt
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** Attachment added: "pidstat-without-bg.txt"
https://bugs.launchpad.net/ubuntu/+source/lxdm/+bug/733912/+attachment/1903963/+files/pidstat-without-bg.txt
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** Attachment added: "cpuinfo.txt"
https://bugs.launchpad.net/ubuntu/+source/lxdm/+bug/733912/+attachment/1903962/+files/cpuinfo.txt
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** Attachment added: "pidstat-with-bg.txt"
https://bugs.launchpad.net/bugs/733912/+attachment/1903961/+files/pidstat-with-bg.txt
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Title:
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