[Bioclusters] Tool to benchmark disk IO?

[Dan Bolser]

On Fri, 24 Sep 2004, Joe Landman wrote:

> Hi Dan:
>
>  What size memory do you have on the test machine?

1548036k

Here is the new result for scsi/ide/nfs

     -------Sequential Output-------- ---Sequential Input-- --Random--
     -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
Machi MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU  /sec %CPU
scs 2047 15781 91.0 33870 20.5 14318  6.1 12880 66.7 33974  8.3 234.0  1.3


Seeker 1...Seeker 2...Seeker 3...start 'em...done...done...done...
         -------Sequential Output-------- ---Sequential Input-- --Random--
         -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
Machi MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU  /sec %CPU
ide 2047 17293 96.4 42104 28.2 18361  8.5 16149 83.9 60721 15.6 141.6  0.7


         -------Sequential Output-------- ---Sequential Input-- --Random--
         -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
Machi MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU  /sec %CPU
nfs 2047  4863 69.2 10959  8.0 11380  8.2  7000 100.0 1520816 100.1 2901.2 17.4




>  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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>>  
>>
>
>