Some Unix benchmarks for those who are interesed

[Ivan Voras]

Artem Kuchin wrote:

> Now i am lost. i get 81MB/sec on dd but still you get
> 
> File Copy 1024 bufsize 2000 maxblocks         3960.0   159513.0      402.8
> 
> and i get
> 
> File Copy 1024 bufsize 2000 maxblocks         3960.0   109313.0      276.0
> 
> The drives i use are Seagate 7200.10 (320Gb, SATA II, 16MB cache
> with perpendicular heads)
> 
> How is it possible that you get 2x file copy perfomance ? What's the
> matter?!

I don't know - what are your seek times?

# diskinfo -t /dev/mirror/data
/dev/mirror/data
        512             # sectorsize
        249999999488    # mediasize in bytes (233G)
        488281249       # mediasize in sectors

Seek times:
        Full stroke:      250 iter in   1.591444 sec =    6.366 msec
        Half stroke:      250 iter in   1.468315 sec =    5.873 msec
        Quarter stroke:   500 iter in   2.828050 sec =    5.656 msec
        Short forward:    400 iter in   2.958083 sec =    7.395 msec
        Short backward:   400 iter in   2.465687 sec =    6.164 msec
        Seq outer:       2048 iter in   0.337428 sec =    0.165 msec
        Seq inner:       2048 iter in   0.384791 sec =    0.188 msec
Transfer rates:
        outside:       102400 kbytes in   1.737217 sec =    58945 kbytes/sec
        middle:        102400 kbytes in   1.811793 sec =    56519 kbytes/sec
        inside:        102400 kbytes in   2.938688 sec =    34845 kbytes/sec

drives:
ad4: 238418MB <WDC WD2500JS-75NCB3 10.02E04> at ata2-master SATA150
ad6: 238418MB <WDC WD2500JS-75NCB3 10.02E04> at ata3-master SATA150


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