It would be great if some one can run this test on other platforms and post the results to the list.
Heres what I got by running the test on my T40 laptop (Intel Pentium (M)1.6Ghz,4200 rpm IDE disk (write cache disabled), 1Gb RAM, Windows 2k, ibm142 )
$java allignWritePerfTest2 temp.dat 1024
ordered by speed gain: max gain seen in case of 64k. buff(K) gain % Alligned write NonAlligned ms ms
64 73.88% 18.75683594 32.61523438
128 44.38% 35.23632813 50.87402344
256 22.58% 70.88378906 86.89257813
512 10.35% 142.5976563 157.3544922
4 7.44% 16.02929688 17.22265625
32 5.14% 16.72363281 17.58398438
8 3.52% 15.82421875 16.38085938
16 0.25% 15.86230469 15.90136719
2 0.06% 15.68652344 15.69628906
6 -0.41% 16.47851563 16.41015625
12 -1.72% 16.41992188 16.13671875
1 -6.42% 15.82324219 14.80664063
10 -6.48% 17.95605469 16.79199219
-- we get slowdown for buffers < 4k -- best gain on 64k ( 73 %)
Sunitha.
