Thanks peter and chris, sounds like the issue is resolved so I'll close
the bug as suggested.
** Changed in: cairo (Ubuntu)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1360606
Title:
libcairo.so for Ubuntu 14.04 is dead-slow compared to Ubuntu 13.10
Status in “cairo” package in Ubuntu:
Fix Released
Bug description:
I'm running the video mixer software called Snowmix that uses libcairo
extensively. After updating to Ubuntu 14.04 Desktop amd64, I noticed
that mixing video required 8 times more CPU compared to Ubuntu 13.10.
Using oprofile I discovered the heavy CPU load was taking place in
libpixman used by libcairo. However libpixman is currently the same
release in Ubuntu 14.04 and 13.10. However I did notice that libcairo
got upgraded from libcairo.so.2.11200.16 in Ubuntu 13.10 to
libcairo.so.2.11301.0 in Uuntu 14.04.
Snowmix uses libcairo2 primarily for scaling and rotating images and
overlay them in memory.
Replacing libcairo.so.2.11301.0 with libcairo.so.2.11200.16 in Ubuntu
14.04 lower the CPU usage by at least 8 times. So I suspect that
libcairo for Ubuntu 14.04 somehow got compiled without the hardware
acceleration such as MMX/SSE2/SSE3 etc. This is quite bad if this is
the case. If it is not the case, something else is seriously wrong
with libcairo2.
1)Description: Ubuntu 14.04.1 LTS
Release: 14.04
2) libcairo2:
Installed: 1.13.0~20140204-0ubuntu1
Candidate: 1.13.0~20140204-0ubuntu1
Version table:
*** 1.13.0~20140204-0ubuntu1 0
500 http://dk.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
100 /var/lib/dpkg/status
3) I expected libcairo2 (libcairo.so.2.11301.0) for Ubuntu14.04 to work as
efficient as libcairo2 (libcairo.so.2.11200.16)for Ubuntu13.10.
4) Libcairo2 for Ubuntu 14.04 works 8 times slower indicating a lack of
MMX/SSE2/SSE3 etc acceleration.
For the source, you have the source for libcairo2 for Ubuntu14.04.
I can provide you with the source code for Snowmix using libcairo2,
but I don't expected you need it nor want it.
Best regards
Peter Maersk-Moller
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: libcairo2 1.13.0~20140204-0ubuntu1
ProcVersionSignature: Ubuntu 3.13.0-34.60-generic 3.13.11.4
Uname: Linux 3.13.0-34-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.3
Architecture: amd64
Date: Sat Aug 23 15:23:38 2014
InstallationDate: Installed on 2013-06-21 (428 days ago)
InstallationMedia: Ubuntu 12.04.2 LTS "Precise Pangolin" - Release amd64
(20130213)
ProcEnviron:
LANGUAGE=en_US:en
TERM=xterm
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: cairo
UpgradeStatus: Upgraded to trusty on 2014-08-20 (3 days ago)
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