[Bioclusters] Tool to benchmark disk IO?

[Joe Landman]

 Hi Dan:

  What size memory do you have on the test machine?

  I usually use 2-4 GB for my tests on machines with 1 GB or less 
memory.  Some of the numbers look a little off.  The SCSI rewrite speed 
is 4x the IDE rewrite speed, and the IDE seems to be doing 133MB/s on 
sequential writes (cool, but I don't believe it unless you have a 
multiway RAID0, or an IDE raid card with a big honking cache ...,  I 
have hit a sustained 110 MB/s on 2 way IDE RAID0's properly tuned).

Joe

Dan Bolser wrote:

>FYI:
>
>Here is my local SCSI and IDE disk for comparison (size 104857600 again)
>
>
>
>           -------Sequential Output-------- ---Sequential Input-- --Random--
>           -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
>Machine MB K/sec %CPU K/sec %CPU  K/sec %CPU K/sec %CPU  K/sec %CPU    /sec %CPU
>scsi   100 10537 76.3 44958 32.5 108986 44.7 12314 74.6 418500 98.1 22027.8 88.1
>
>
>
>           -------Sequential Output-------- ---Sequential Input-- --Random--
>           -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
>Machine MB K/sec %CPU  K/sec %CPU K/sec %CPU K/sec %CPU  K/sec %CPU    /sec %CPU
>ide    100 13921 89.5 133969 81.1 27470 11.8 14553 87.6 430990 96.8 21952.2 93.3
>
>
>
>           -------Sequential Output-------- ---Sequential Input-- --Random--
>           -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
>Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU   K/sec %CPU   /sec %CPU
>nfs    100  4240 25.9  5437  2.1  4780  2.4 19595 100.1 566942 99.7 2023.0 10.1
>
>
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>  
>

-- 
Joseph Landman, Ph.D
Scalable Informatics LLC,
email: landman@scalableinformatics.com
web  : http://scalableinformatics.com
phone: +1 734 612 4615