On Apr 27, 2007 15:41 +0200, Valerie Clement wrote: > As asked by Alex, I included in the test results the file fragmentation > level and the number of I/Os done during the file deletion. > > Here are the results obtained with a not very fragmented 100-GB file: > > | ext3 ext4 + extents xfs > ------------------------------------------------------------ > nb of fragments | 796 798 15 > elapsed time | 2m0.306s 0m11.127s 0m0.553s > | > blks read | 206600 6416 352 > blks written | 13592 13064 104 > ------------------------------------------------------------ > > > And with a more fragmented 100-GB file: > > | ext3 ext4 + extents xfs > ------------------------------------------------------------ > nb of fragments | 20297 19841 234 > elapsed time | 2m18.914s 0m27.429s 0m0.892s > | > blks read | 225624 25432 592 > blks written | 52120 50664 872 > ------------------------------------------------------------ > > > More details on our web site: > http://www.bullopensource.org/ext4/20070404/FileDeletion.html Ah, one thing that is only mentioned in the URL is that the "IO count" is in units of 512-byte sectors. In the case of XFS doing logical journaling this avoids a huge amount of double writes to the journal and then to the filesystem. I still think ext4 could do better than it currently does. Cheers, Andreas -- Andreas Dilger Principal Software Engineer Cluster File Systems, Inc. - To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
