touch-packages team mailing list archive

[Peter Maersk-Moller <pmaersk@xxxxxxxxx>]

Hi Chris.


Thanks for the tips. So what you are saying that for libcairo.so.2.11200.16
the default filter for  cairo_set_source_surface
<http://cairographics.org/cairo/cairo-cairo-t.html#cairo-set-source-surface>
was CAIRO_FILTER_FAST and now for libcairo.so.2.11.301.0 it is
CAIRO_FILTER_BEST.

I have tried the filters and found the following:

Adding CAIRO_FILTER_FAST or CAIRO_FILTER_NEAREST performs equally will in
terms of execution time for the test code as well for my application the
video mixer Snowmix. In fact they are a bit faster for Ubuntu 14.04
compared to best timing fir Ubuntu 13.11.

Using CAIRO_FILTER_GOOD, CAIRO_FILTER_BEST or CAIRO_FILTER_BILINEAR all
performs equally in terms of execution time and are approximately 50 times
slower.

You ask why I do this in CPU. What else can I do? I am mixing several HD
Live Streams into a single stream for encoding and streaming. Any hints and
suggestions are very very welcome.

Thanks for the help so far. It is much appreciated and the solution has
been included and are going to be communicated to users of Snowmix on the
net today.

Best regards
Peter Maersk-Moller



On Thu, Aug 28, 2014 at 10:16 AM, Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
wrote:

> As expected, it is just that the reconstruction filter for
> CAIRO_FILTER_BEST in pixman has been substantially improved  (image
> quality wise). To maintain existing filter behaviour,  you need to
> explicitly choose CAIRO_FILTER_BILINEAR, or CAIRO_FILTER_FAST. Also is
> there any reason why you are using the CPU for this operation?
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> 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:
>   New
>
> 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)
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu/+source/cairo/+bug/1360606/+subscriptions
>

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to cairo in Ubuntu.
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:
  New

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)

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/cairo/+bug/1360606/+subscriptions