libjpeg8c vs libjpeg-turbo with libjpeg8 compat on
riku.voipio at linaro.org
Fri Oct 28 09:05:38 UTC 2011
On 27 October 2011 12:38, Matthias Klose <doko at ubuntu.com> wrote:
> I doubt that Ubuntu will reconsider this for Precise, but I see that you did
> schedule a session for UDS/Connect . It would be good, if you could provide
> relevant information for the session:
> - performance data from your wiki in a precise/12.04 environment,
> not just for arm, but for all supported Ubuntu architectures.
> Performance data from a natty environment doesn't really help.
> How does this compare to a libjpeg8 targeted to newer CPUs?
> Such a library could be used via hwcap.
Fedora switched to libjpeg-turbo and reports in their release notes:
"The libjpeg library has been replaced by libjpeg-turbo library which
has same API/ABI but is at least twice faster on all primary
architectures and about 25% faster on secondary architectures."
> - A test rebuild for packages build-depending on libjpeg*-dev.
> Not sure if this will catch all issues, but it's a start.
> That should give an estimate for sourceful and sourceless
> changes needed, and for which packages you'll have to
> maintain a delta compared to Debian.
Since libjpeg-turbo is API/ABI compatible, it would not even require a
rebuild. This makes the transition actually smoother than the
transition to libjpeg8 fork of the original libjpeg.
More information about the ubuntu-devel