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From: "plasmahh at gmx dot net" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/54075] [4.7.1] unordered_map 3x slower than 4.6.2
Date: Thu, 26 Jul 2012 12:30:00 -0000	[thread overview]
Message-ID: <bug-54075-4-QiBtO36JXQ@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-54075-4@http.gcc.gnu.org/bugzilla/>

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54075

--- Comment #12 from Dennis Lubert <plasmahh at gmx dot net> 2012-07-26 12:30:00 UTC ---
I can confirm that now the reserve works as I would expect it (causing no
further rehashes). However the amount of rehashes done in the testcase is still
155 (needing 4.5s), while gcc 4.6 only needs 21 (needing 1.5s).

Monitoring the bucket counts on resizes it seems that gcc 4.8 is now much more
fine grained than gcc 4.6. I am unsure if this is expected, deliberate and/or a
good idea.


  parent reply	other threads:[~2012-07-26 12:30 UTC|newest]

Thread overview: 49+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-07-23 23:07 [Bug libstdc++/54075] New: " likan_999.student at sina dot com
2012-07-23 23:08 ` [Bug libstdc++/54075] " likan_999.student at sina dot com
2012-07-23 23:09 ` likan_999.student at sina dot com
2012-07-23 23:12 ` paolo.carlini at oracle dot com
2012-07-23 23:23 ` paolo.carlini at oracle dot com
2012-07-24  0:17 ` likan_999.student at sina dot com
2012-07-24  0:29 ` paolo.carlini at oracle dot com
2012-07-24  0:43 ` likan_999.student at sina dot com
2012-07-24 10:42 ` plasmahh at gmx dot net
2012-07-24 20:15 ` fdumont at gcc dot gnu.org
2012-07-24 20:19 ` fdumont at gcc dot gnu.org
2012-07-25  9:56 ` paolo.carlini at oracle dot com
2012-07-25 19:33 ` fdumont at gcc dot gnu.org
2012-07-26 12:30 ` plasmahh at gmx dot net [this message]
2012-07-26 12:32 ` fdumont at gcc dot gnu.org
2012-07-26 17:36 ` paolo.carlini at oracle dot com
2012-07-26 22:10 ` likan_999.student at sina dot com
2012-07-26 22:50 ` chip at pobox dot com
2012-07-26 22:55 ` paolo.carlini at oracle dot com
2012-07-26 23:39 ` [Bug libstdc++/54075] [4.7.1] unordered_map insert " chip at pobox dot com
2012-07-27  0:33 ` redi at gcc dot gnu.org
2012-07-27  1:00 ` chip at pobox dot com
2012-07-27  7:58 ` fdumont at gcc dot gnu.org
2012-07-27 19:21 ` plasmahh at gmx dot net
2012-07-29 16:44 ` fdumont at gcc dot gnu.org
2012-07-29 17:06 ` fdumont at gcc dot gnu.org
2012-09-26 23:11 ` paolo.carlini at oracle dot com
2012-10-22 20:50 ` cracauer at cons dot org
2012-10-22 21:05 ` paolo.carlini at oracle dot com
2012-10-22 22:04 ` cracauer at cons dot org
2012-10-22 22:47 ` paolo.carlini at oracle dot com
2012-10-24 19:28 ` fdumont at gcc dot gnu.org
2012-10-25 17:48 ` cracauer at cons dot org
2012-10-26 14:35 ` paolo.carlini at oracle dot com
2012-11-03 15:28 ` fdumont at gcc dot gnu.org
2012-11-04  4:55 ` foom at fuhm dot net
2012-11-05 12:55 ` [Bug libstdc++/54075] [4.7.1] unordered_map insert still " paolo.carlini at oracle dot com
2012-11-05 22:12 ` tlawrence85 at gmail dot com
2012-11-06  0:59 ` paolo.carlini at oracle dot com
2012-11-06 21:23 ` fdumont at gcc dot gnu.org
2012-11-06 21:34 ` paolo.carlini at oracle dot com
2012-11-07 22:03 ` frs.dumont at gmail dot com
2012-11-08  0:59 ` jwakely.gcc at gmail dot com
2012-11-08  1:56 ` paolo.carlini at oracle dot com
2012-11-08  2:26 ` paolo.carlini at oracle dot com
2012-11-08 20:06 ` fdumont at gcc dot gnu.org
2012-11-08 20:16 ` fdumont at gcc dot gnu.org
2012-11-08 20:21 ` frs.dumont at gmail dot com
2012-11-08 21:19 ` frs.dumont at gmail dot com

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