A few more tests with a slightly improved version of the program
(attached): We (i.e FreeBSD) do noticeably better with bigger block sizes.
Cheers
Mark
Gentoo - 2.6.18-gentoo-r3:
-----------------------
$ ./readtest /data0/dump/file 8192 0
random reads: 100000 of: 8192 bytes elapsed: 1.2698s io rate: 645155193
bytes/s
$ ./readtest /data0/dump/file 8192 1
sequential reads: 100000 of: 8192 bytes elapsed: 1.1329s io rate:
723129371 bytes/s
$ ./readtest /data0/dump/file 32768 0
random reads: 25000 of: 32768 bytes elapsed: 1.1583s io rate: 707244595
bytes/s
$ ./readtest /data0/dump/file 32768 1
sequential reads: 25000 of: 32768 bytes elapsed: 1.1178s io rate:
732838631 bytes/s
$ ./readtest /data0/dump/file 65536 0
random reads: 12500 of: 65536 bytes elapsed: 1.1478s io rate: 713742417
bytes/s
$ ./readtest /data0/dump/file 65536 1
sequential reads: 12500 of: 65536 bytes elapsed: 1.1012s io rate:
743921133 bytes/s
FreeBSD - 6.2-PRERELEASE #7: Mon Nov 27 19:32:33 NZDT 2006 :
------------------------------------------------------------
$ ./readtest /data0/dump/file 8192 0
random reads: 100000 of: 8192 bytes elapsed: 4.4477s io rate: 184186327
bytes/s
$ ./readtest /data0/dump/file 8192 1
sequential reads: 100000 of: 8192 bytes elapsed: 1.9797s io rate:
413804878 bytes/s
$ ./readtest /data0/dump/file 32768 1
sequential reads: 25000 of: 32768 bytes elapsed: 1.7068s io rate:
479965034 bytes/s
$ ./readtest /data0/dump/file 32768 0
random reads: 25000 of: 32768 bytes elapsed: 2.0076s io rate: 408040469
bytes/s
$ ./readtest /data0/dump/file 65536 0
random reads: 12500 of: 65536 bytes elapsed: 1.7856s io rate: 458778279
bytes/s
$ ./readtest /data0/dump/file 65536 1
sequential reads: 12500 of: 65536 bytes elapsed: 1.6611s io rate:
493158866 bytes/s
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