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Re: [PATCH v2] Custom compression levels for objects and packs

From
DHDana How <danahow@gmail.com>
Date
May 9, 2007, 00:29 UTC
Message-ID
<56b7f5510705081729t34a585c6y9ca9e2f9963d24a2@mail.gmail.com>
In-Reply-To
<alpine.LFD.0.99.0705082010230.24220@xanadu.home>
On 5/8/07, Nicolas Pitre <nico@cam.org> wrote:
Show 10 quoted lines
> On Tue, 8 May 2007, Junio C Hamano wrote:
> > Dana How <danahow@gmail.com> writes:
> > > +   /* differing core & pack compression when loose object -> must recompress */
> > > +   if (!entry->in_pack && pack_compression_level != zlib_compression_level)
> > > +           to_reuse = 0;
> > > +   else
> > I am not sure if that is worth it, as you do not know if the
> > loose object you are looking at were compressed with the current
> > settings.
> I was about to make the same comment.

I was bitten by *not* doing this. Please see the more verbose reply to Junio's comment.

Show 9 quoted lines
> > Could we somehow remove _seen?  Perhaps by initializing the
> > _level to -1?
>
> -1 is a valid value for compression.  Actually it is equivalent to
> Z_DEFAULT_COMPRESSION.
>
> If we want the fallback logic to work, at some point we must remember if
> the current value is the default or if it is the result of an explicit
> config option.

I can leave as-is, or use a magic value like -99 and depend on it not colliding with values in zlib.h.

Thanks,
-- 
Dana L. How  danahow@gmail.com  +1 650 804 5991 cell
Previous: Nicolas PitreNext: Nicolas Pitre
Message 4 of 23 in “Custom compression levels for objects and packs”
  1. Custom compression levels for objects and packsDana How, May 8, 2007
  2. Junio C HamanoMay 8, 2007
  3. Nicolas PitreMay 9, 2007
  4. Dana HowMay 9, 2007
  5. Nicolas PitreMay 9, 2007
  6. Dana HowMay 9, 2007
  7. Junio C HamanoMay 9, 2007
  8. Dana HowMay 9, 2007
  9. Nicolas PitreMay 9, 2007
  10. Dana HowMay 9, 2007
  11. Nicolas PitreMay 9, 2007
  12. Junio C HamanoMay 9, 2007
  13. Dana HowMay 9, 2007
  14. make "repack -f" imply "pack-objects --no-reuse-object"Nicolas Pitre, May 9, 2007
  15. deprecate the new loose object header formatNicolas Pitre, May 9, 2007
  16. Dana HowMay 9, 2007
  17. Nicolas PitreMay 9, 2007
  18. Dana HowMay 9, 2007
  19. Junio C HamanoMay 9, 2007
  20. Dana HowMay 9, 2007
  21. Petr BaudisMay 9, 2007
  22. Theodore TsoMay 9, 2007
  23. Dana HowMay 9, 2007

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