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Re: RFC: Flat directory for notes, or fan-out? Both!

From
Johannes Schindelin <johannes.schindelin@gmx.de>
Date
Feb 10, 2009, 17:31 UTC
Message-ID
<alpine.DEB.1.00.0902101810410.10279@pacific.mpi-cbg.de>
In-Reply-To
<20090210165610.GP30949@spearce.org>
Hi,
On Tue, 10 Feb 2009, Shawn O. Pearce wrote:
Show 15 quoted lines
> Johannes Schindelin <Johannes.Schindelin@gmx.de> wrote:
> > On Tue, 10 Feb 2009, Junio C Hamano wrote:
> > > 
> > > I could do a revert on 'master' if it is really needed, but I found that
> > > the above reasoning is a bit troublesome.  The thing is, if a tree to hold
> > > the notes would be huge to be unmanageable, then it would still be huge to
> > > be unmanageable if you split it into 256 pieces.
> > 
> > The thing is, a tree object of 17 megabyte is unmanagably large if you 
> > have to read it whenever you access even a single node.  Having 256 trees 
> > instead, each of which is about 68 kilobyte is much nicer.
> 
> See my other email on this thread; we'd probably need to unpack
> all 256 subtrees *anyway* due to the distribution of SHA-1 names
> for commits.

No, that is not true. It is only true if you show more than 94180 commit, actually, as only then the probability that you hit all 256 buckets is larger than 50 percent.

In general, you will look at only a few commits, though.

Ciao, Dscho

Previous: Shawn O. PearceNext: Junio C Hamano
Message 18 of 33 in “RFC: Flat directory for notes, or fan-out? Both!”
  1. Johannes SchindelinFeb 9, 2009
  2. Boyd Stephen Smith Jr.Feb 10, 2009
  3. Jeff KingFeb 10, 2009
  4. Boyd Stephen Smith Jr.Feb 11, 2009
  5. Linus TorvaldsFeb 11, 2009
  6. Sam VilainFeb 11, 2009
  7. Linus TorvaldsFeb 11, 2009
  8. Sam VilainFeb 11, 2009
  9. Johannes SchindelinFeb 11, 2009
  10. Jeff KingFeb 10, 2009
  11. Johannes SchindelinFeb 10, 2009
  12. Jeff KingFeb 10, 2009
  13. Johannes SchindelinFeb 10, 2009
  14. Junio C HamanoFeb 10, 2009
  15. Shawn O. PearceFeb 10, 2009
  16. Johannes SchindelinFeb 10, 2009
  17. Shawn O. PearceFeb 10, 2009
  18. Johannes SchindelinFeb 10, 2009
  19. Junio C HamanoFeb 10, 2009
  20. Shawn O. PearceFeb 10, 2009
  21. Johannes SchindelinFeb 10, 2009
  22. Thomas RastFeb 10, 2009
  23. Thomas RastFeb 10, 2009
  24. Junio C HamanoFeb 10, 2009
  25. Jeff KingFeb 11, 2009
  26. Johannes SchindelinFeb 11, 2009
  27. Junio C HamanoFeb 11, 2009
  28. Johannes SchindelinFeb 11, 2009
  29. Shawn O. PearceFeb 10, 2009
  30. Johannes SchindelinFeb 10, 2009
  31. Shawn O. PearceFeb 10, 2009
  32. Sam VilainFeb 11, 2009
  33. Sam VilainFeb 11, 2009

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