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From Suresh Thalamati <tsur...@Source-Zone.org>
Subject Re: alligned Vs Non Alligned log writes ..
Date Thu, 09 Dec 2004 01:07:45 GMT
Daniel John Debrunner wrote:

>
> >>It would be great if  some one can run this test on other platforms and
> >>post the results to the list.
>
>
> On Suse Linux, with an old Dell machine (2cpu 733Mhz Pentium) I see no
> real difference between aligned and non-aligned writes.
> I used Sun's 1.4.2 & 1.5.0 and IBM's 1.4.2 vms
>
> Dan.


I  also ran on linux,  there does not seem to be any major difference
between aligned vs non-aligned. 

FYI:
OS: suse linux ( 2.4.21-202-smp4G)
cpu :  2 731 MHZ pentium III processors
memory: 256 MB
disk: SCSI  10600 rpm (Tagged Queuing enabled)
file system: reiserfs (rw)
JVM:Classic VM (build 1.4.2, J2RE 1.4.2 IBM build cxia32142-20040926
(JIT enable
d: jitc))
write cache enabled: NO

(Buffer-Size(K) | Alligned Write(msec) |NonAlligned Write(msec)) | gain %

512 |  47.3818359375  |  49.673828125  |  4.837280240730436%
256 |  35.9814453125  |  37.6083984375  |  4.521644727914236%
128 |  28.541015625  |  35.5166015625  |  24.44056661876411%
64 |  27.0712890625  |  26.033203125  |  -3.8346380000721467%
32 |  25.2734375  |  25.2626953125  |  -0.042503863987633395%
16 |  24.853515625  |  24.9521484375  |  0.3968565815324183%
12 |  24.6181640625  |  24.7978515625  |  0.7298980522829197%
10 |  24.9287109375  |  25.6162109375  |  2.757864222196106%
8 |  24.677734375  |  24.6181640625  |  -0.2413929560743965%
6 |  24.591796875  |  24.7333984375  |  0.5758081169089032%
4 |  24.51171875  |  24.654296875  |  0.5816733067729084%
2 |  24.4208984375  |  24.548828125  |  0.5238533210701004%
1 |  24.466796875  |  24.490234375  |  0.09579308693222639%


Thanks
-suresht


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