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Re: Abolishing ChangeLog files

From: Eli Zaretskii
Subject: Re: Abolishing ChangeLog files
Date: Thu, 28 Mar 2013 23:29:53 +0200

> Date: Fri, 29 Mar 2013 01:04:35 +0400
> From: Dmitry Gutov <address@hidden>
> Cc: address@hidden, address@hidden
> To answer your question, then, yes, 4.5 times faster indeed is "much 
> more quickly". The difference here is not critical, but nice to have.

Get real!  This started from the example of someone looking at the log
entry; human needs much more than a few hundreds of milliseconds to
read it, so a difference of 700 msec (for 5000 revisions!) is entirely
irrelevant.  Do you really know someone who can read 5000 entries in
under one second?

> >> In my experience, Bzr is especially slow when showing log for a subtree
> >> or a specific file.
> >
> > I could ask you to show numbers (because I have no such experience),
> > but I won't.  No one in this thread wants any serious discussion,
> > anyway.
> I would send you the numbers if you pointed me at the mingw port of 
> 'time' you're apparently using.

I wrote that program myself.  Unix 'time' cannot be ported, because it
uses too many Posix APIs.

> But here's an example command:
>    git log lisp\progmodes\ruby-mode.el | less
> It takes about 300ms on the first run and is instantaneous after that.

Not here:

  $ time git log lisp/progmodes/ruby-mode.el > /dev/null

  real    0m5.140s
  user    0m0.015s
  sys     0m0.000s

  D:\gnu\bzr\emacs\msys-build>timep bzr log lisp\progmodes\ruby-mode.el > nul

  real    00h00m04.281s
  user    00h00m04.078s
  sys     00h00m00.218s

Entirely comparable.  And re-running the commands doesn't change the
times, so I don't think any caching is involved.

> Anyway, the most important speedup I expect to see is the time it takes 
> to do "git pull" vs "bzr update". I haven't done any real testing there 
> yet, but the latter command takes entirely too long.

Depends on how large is your pull.  E.g., the initial "git clone" took
me almost 3 hours; bzr did the same in under 50 min.

But we have been all through this, time and again.  The real numbers
don't convince anyone.  It's a religious argument since day one.

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