Bug#808579: Not fixed?

[Eugen Dedu <eugen.dedu@univ-fcomte.fr>]

On 26/12/15 15:14, Niels Thykier wrote:
> Eugen Dedu:
> > Hi,
> >
> > I have had the same problem since apt 1.1 version.  Now I have 1.1.6,
> > but this bug is still not fixed: apt-get update takes much time during
> > rred phase.
>
> Hi,
>
> For reference, the following commit was done today, which might be of
> interest:
>
> https://anonscm.debian.org/cgit/apt/apt.git/commit/?id=0b29c72
> """
> Use a hardcoded buffer size of 4096 to fix performance
>
> The code uses memmove() to move parts of the buffer to the
> front when the buffer is only partially read. By simply
> reading one page at a time, the maximum size of bytes that
> must be moved has a hard limit, and performance improves:
>
> In one test case, consisting of a 430 MB Contents file,
> and a 75K PDiff, applying the PDiff previously took about
> 48 seconds and now completes in 2 seconds.

Indeed, it is extremely fast now, thank you!

> Further speed up can be achieved by buffering writes, they
> account for about 60% of the run-time now.
> """
>
> It will probably be a part of the next APT release.

--
Eugen