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Re: [PATCH] Avoid accessing a slow working copy during diffcore operations.

From
Johannes Schindelin <johannes.schindelin@gmx.de>
Date
Dec 14, 2006, 14:12 UTC
Message-ID
<Pine.LNX.4.63.0612141511110.3635@wbgn013.biozentrum.uni-wuerzburg.de>
In-Reply-To
<81b0412b0612140557u225ca00du5b15823d05fda4b9@mail.gmail.com>
Hi,
On Thu, 14 Dec 2006, Alex Riesen wrote:
Show 7 quoted lines
> On 12/14/06, Shawn O. Pearce <spearce@spearce.org> wrote:
> > If Git is compiled with NO_FAST_WORKING_DIRECTORY set then we will
> > avoid looking at the working directory when the blob in question
> > is available within a packfile and the caller doesn't need the data
> > unpacked into a temporary file.
> 
> Why can't it be useful in generic code? What are the downsides?

It is usually cheaper to just read the file, especially if it is still cached, because the alternative means unpacking the loose object, or worse, unpacking the packed object _along_ with the objects in its delta chain.

Not every OS sucks cache-wise, and you should not make others suffer for Redmond's shortcomings.

Ciao, Dscho

Previous: Alex RiesenNext: Alex Riesen
Message 3 of 10 in “Avoid accessing a slow working copy during diffcore operations.”
  1. Avoid accessing a slow working copy during diffcore operations.Shawn O. Pearce, Dec 14, 2006
  2. Alex RiesenDec 14, 2006
  3. Johannes SchindelinDec 14, 2006
  4. Alex RiesenDec 14, 2006
  5. Johannes SchindelinDec 14, 2006
  6. Jakub NarebskiDec 15, 2006
  7. Shawn PearceDec 15, 2006
  8. Junio C HamanoDec 16, 2006
  9. Johannes SchindelinDec 16, 2006
  10. Junio C HamanoDec 16, 2006

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