On Thu, Feb 13, 2014 at 06:34:39PM +0900, Mike Hommey wrote: > 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.
Specifically, I thought you were talking about git checkout. Mike -- To unsubscribe from this list: send the line "unsubscribe git" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
