Re: Q: xz multi-threaded compression support and dpkg-dev

[Guillem Jover <guillem@debian.org>]

Hi!

On Thu, 2015-11-12 at 22:32:07 +0900, Hideki Yamane wrote:
>  Just a question, newer xz-utils has multi-threaded compression support(*).
> 
> >>     * liblzma:
> >> 
> >>         - Added support for multi-threaded compression. 
> 
>  If debian would introduce that version, can we get any benefit from this
>  for dpkg-dev?
> 
>  *) http://git.tukaani.org/?p=xz.git;a=blob;f=NEWS;hb=HEAD

AFAICS if the threading is enabled in the xz-utils build, then the xz
tool should opportunistically make use of the threaded encoder. That
would cover dpkg-source transparently.

For the dpkg-deb code, switching to use the multithreaded encoder is
rather easy, but given that the libdpkg/dpkg-deb code is not thread-safe
at all, overall it would be way more tricky.

But, yes we'd first need the library to be available in testing at
least.

Thanks,
Guillem