Dear XFS developers,
While a single bonnie++ benchmarks shows excellent[1] performance
on my test machine, two parallel bonnie++s still excel in write
performance, but crawl[2] in read performance. What is the effect
I'm seeing here?
Peter
[1]
Version 1.01b ------Sequential Output------ --Sequential Input- --Random-
-Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
xfs_1 3G 11236 99 63619 51 17625 18 10133 88 58129 28 94.9 0
------Sequential Create------ --------Random Create--------
-Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files:max:min /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16:15000:12/512 785 18 25534 101 1378 29 1582 37 24665 99 1575 29
[2]
Version 1.01b ------Sequential Output------ --Sequential Input- --Random-
-Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
xfs_2_1 2G 10851 98 42060 38 5277 5 4261 37 4040 1 47.8 0
------Sequential Create------ --------Random Create--------
-Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files:max:min /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16:15000:12/512 313 10 22666 98 763 24 403 15 23511 99 182 7
Version 1.01b ------Sequential Output------ --Sequential Input- --Random-
-Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
xfs_2_2 2G 10620 96 42498 39 5618 5 4296 37 3987 1 47.9 0
------Sequential Create------ --------Random Create--------
-Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files:max:min /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16:15000:12/512 307 9 20354 99 804 22 428 14 23531 100 176 6
--
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Kelemen Péter / \ / \ / fuji@xxxxxxx
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