On Wed, Sep 24, 2008 at 9:18 PM, Diego Liziero diegoliz@gmail.com wrote:
I've read somewhere that one of gfs2 goals was to improve performance for directory access with many files.
I've tested it doing a simple ls in a directory with many test empty files in gfs and it was _really_ slow, doing the ls on a gfs2 with the same amount of emtpy files is actually faster.
But when I tested gfs2 with bonnie++ I got fewer sequential I/O speed than in gfs (consider that I tested a beta version of gfs2 some months ago, maybe things are better now).
This seems true only for sequential write speed.
So my conclusion of the tests was that gfs is best with mbox, gfs2 beta with maildir.
But, again, I haven't tested gfs2 improvements recently.
Regards, Diego.
I lauched bonnie++ on the same lvm2 partition formatted with different filesystems to test their speed. Consider that I launced the test just one time per filesystem, so the numbers should not be considered sharp, but with a certain percentage of error.
With clustered filesystems (gfs and gfs2) the test has been launched on the same box, but with the fillesystem mounted on two nodes. Option used to format gfs and gfs2: "-r 2048 -p lock_dlm -j 4"
The test box has two dual-core Opteron processors, 8 Gb of ram, two 4Gb fiber channel HBA, gigabit ethernet (for the distributed lock manager connection) and Centos 5.2 x86_64 installed.
With this configuration it seems that: gfs is faster than gfs2 when writing sequential blocks, much faster in creating and deleting files; gfs2 seems to have a faster read speed.
Regards, Diego.
bonnie++ -s 16g Version 1.03c ------Sequential Output------ --Sequential Input- --Random- -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks-- Filesystem Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP ext2 16G 69230 95 149430 47 54849 25 71681 90 215568 54 473.3 1 xfs 16G 62828 94 135482 54 64010 28 71841 92 238351 51 632.3 2 ext3 16G 56485 93 115398 68 56051 32 73536 92 211219 48 552.0 2 gfs 16G 47079 98 124123 82 42651 53 65692 91 189533 65 431.5 3 gfs2 16G 40203 77 74620 53 52596 39 73187 93 226909 58 496.2 2
------Sequential Create------ --------Random Create--------
-Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CPext2 16 3810 99 +++++ +++ +++++ +++ 2395 99 +++++ +++ 10099 99 xfs 16 2446 51 +++++ +++ 1073 24 2019 59 +++++ +++ 796 21 ext3 16 5597 77 +++++ +++ 16764 99 19450 99 +++++ +++ +++++ +++ gfs 16 882 40 +++++ +++ 4408 82 1001 56 +++++ +++ 2734 69 gfs2 16 457 0 +++++ +++ 994 0 477 0 +++++ +++ 995 29