Re: Terrible bad performance for it blame --date=iso -C

From: SZEDER Gábor <szeder.dev@gmail.com>
Date: Apr 3, 2017, 10:56 UTC
Message-ID: <20170403105641.16912-1-szeder.dev@gmail.com>
In-Reply-To: <58E1F239020000A100025732@gwsmtp1.uni-regensburg.de>

Show 5 quoted lines

> In the other case (for the user bored of waiting seeking for some
> entertainment ;-)) a "-v (verbose) option could be useful.  Or at the
> very least: If git is expecting that some operation will take (or
> already did take) a lot of time, give some message explaining why it
> is taking a lot of time, and maybe how to avoid that.

It already does so by default since v2.8.0, see aba37f495 (blame: add support for --[no-]progress option, 2015-12-12).

  $ time git blame sha1_file.c |wc -l
  4026
  
  real    0m1.744s
  user    0m1.672s
  sys     0m0.068s
  $ time git blame -C -C sha1_file.c |wc -l
  Blaming lines: 100% (4026/4026), done.
  4026
  
  real    0m3.832s
  user    0m3.716s
  sys     0m0.112s

However, after a short peek at that commit, it only displays progress by default when stderr is a terminal, which might not be the case when invoked from emacs.