Bug 63597

Summary:	weston terminal: very high cpu usage
Product:	Wayland	Reporter:	wbrana
Component:	weston	Assignee:	Wayland bug list <wayland-bugs>
Status:	RESOLVED NOTABUG	QA Contact:
Severity:	normal
Priority:	medium
Version:	1.0.90
Hardware:	Other
OS:	All
Whiteboard:
i915 platform:		i915 features:

Description wbrana 2013-04-16 11:23:15 UTC

running command: top -d 0.1
causes 40% CPU usage by weston-terminal 1.1

running same command in rxvt-unicode with xorg-server causes total CPU usage by rxvt-unicode and xorg-server about 0.5%

GPU Intel Sandy Bridge GT1
Mesa 9.1.1

rxvt-unicode was tested with default bitmap font
XFCE without compositing
xf86-video-intel 2.21.6 with SNA

Comment 1 wbrana 2013-04-16 11:47:11 UTC

terminal windows were maximized

Comment 2 Rob Bradford 2013-07-08 11:45:05 UTC

Using sysprof to analyse this I see that we spend a large amount of time in idle_redraw - a function that is throttled by the compositor (to vblank in the DRM case and in the case of X11 every 10ms)

What we end up doing in that function is drawing all the glyphs using the Cairo image backend something that cannot really be compared with rxvt. weston-terminal is a "toy" terminal emulator and I don't believe there is any bug present here.

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