Subject: Massive performance regression makes diff unusable
From: Andreas Schwab <[email-masked]>
To: [email-masked]
Date: Mon, 17 Oct 2016 15:03:05 +0200
List-Id: <debbugs-submit.debbugs.gnu.org>

$ wc tmp.*
  6712297  27215448 135217073 tmp.1
  6712247  27215244 135216202 tmp.2
 13424544  54430692 270433275 total

$ diff --version | head -1
diff (GNU diffutils) 3.3
$ time diff -u tmp.* > xx
17.023user 8.246system 0m25.335selapsed 99.74%CPU

$ diff --version | head -1
diff (GNU diffutils) 3.5
$ time diff -u tmp.* > yy
5020.640user 3.176system 83m50.461selapsed 99.86%CPU

Andreas.

-- 
Andreas Schwab, SUSE Labs, [email-masked]
GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE  1748 E4D4 88E3 0EEA B9D7
"And now for something completely different."