On Thu, Feb 13, 2014 at 07:04:02AM +0100, David Kastrup wrote:
> Mike Hommey <m...@glandium.org> writes:
> > On Wed, Feb 12, 2014 at 08:15:24PM +0100, David Kastrup wrote:
> >> Stefan Zager <sza...@chromium.org> writes:
> >> > On Wed, Feb 12, 2014 at 10:50 AM, David Kastrup <d...@gnu.org> wrote:
> >> >
> >> >> Really, give the above patch a try. I am taking longer to finish it
> >> >> than anticipated (with a lot due to procrastination but that is,
> >> >> unfortunately, a large part of my workflow), and it's cutting into my
> >> >> "paychecks" (voluntary donations which to a good degree depend on timely
> >> >> and nontrivial progress reports for my freely available work on GNU
> >> >> LilyPond).
> >> >
> >> > I will give that a try. How much of a performance improvement have
> >> > you clocked?
> >> Depends on file type and size. With large files with lots of small
> >> changes, performance improvements get more impressive.
> >> Some ugly real-world examples are the Emacs repository, src/xdisp.c
> >> (performance improvement about a factor of 3), a large file in the style
> >> of /usr/share/dict/words clocking in at a factor of about 5.
> >> Again, that's with an SSD and ext4 filesystem on GNU/Linux, and there
> >> are no improvements in system time (I/O) except for patch 4 of the
> >> series which helps perhaps 20% or so.
> >> So the benefits of the patch will come into play mostly for big, bad
> >> files on Windows: other than that, the I/O time is likely to be the
> >> dominant player anyway.
> > How much fragmentation does that add to the files, though?
> Uh, git-blame is a read-only operation. It does not add fragmentation
> to any file. The patch will add a diff of probably a few dozen hunks to
> builtin/blame.c. Do you call that "fragmentation"? It is small enough
> that I expect even
> git blame builtin/blame.c
> to be faster than before. But that interpretation of your question
> probably tries to make too much sense out of what is just nonsense in
> the given context.
Sorry, I thought you were talking about write operations, not reads.
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