From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bob Peterson Date: Wed, 11 Sep 2013 13:43:55 -0500 Subject: [Cluster-devel] [GFS2 PATCH 0/5] GFS2: Bitmap search optimizations Message-ID: <1378925045-23318-1-git-send-email-rpeterso@redhat.com> List-Id: To: cluster-devel.redhat.com MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit This set of 5 patches increases the speed of GFS2's bitmap search algorithms. To test the performance, I added instrumentation to function gfs2_inplace_reserve to report the amount of time spent there. With the "stock" gfs2, I got 64586490 microseconds while running postmark with 100000 transactions and 100000 files. With the patched gfs2, I got 49441435, which is nearly 24% faster. Without the 5 GFS2 patches, postmark gave this result: 852.13 megabytes written (970.61 kilobytes per second) With the 5 patches GFS2, I got: 852.13 megabytes written (979.32 kilobytes per second) So overall, postmark performance was only 1% faster. Using straight dd copying 1MB files, I got 10% faster. Obviously mileage will vary: my hardware isn't the fastest. The patches are as follows: [PATCH 1/5] GFS2: optimize rbm_from_block wrt bi_start [PATCH 2/5] GFS2: introduce bi_blocks for optimization [PATCH 3/5] GFS2: Introduce rbm field bii [PATCH 4/5] GFS2: new function gfs2_rbm_incr [PATCH 5/5] GFS2: Do not reset flags on active reservations Regards, Bob Peterson Red Hat File Systems