[Disksim-users] HELP!! "RETURNING NULL!!"[AS scheduling policy = 8(SPTF_OPT)]

[daijiao0403]

 I'm using disksim-3.0.
 
Run disksim as follows,it's OK!
/disksim ascii.parv ascii.outv ascii ascii.trace 0
 
//ascii.parv & ascii.trace are the files provided by the disksim itself( in  ../valid/)
 
Then I edit ascii.parv, change the scheduling policy into 8 (3 original)which represents SPTF_OPT.
Run it again,the result shows as follows:
/disksim ascii.parv ascii.outv ascii ascii.trace 0
RETURNING NULL!!
RETURNING NULL!!
RETURNING NULL!!
RETURNING NULL!!
RETURNING NULL!!
RETURNING NULL!!
RETURNING NULL!!
.....
 
Why? SPTF_OPT is widely used in real system ,disksim must have implemented it,but how does this happen...Looking forwards to your answers!!Thank you!!
 Best wishes!!
 
D.J.
03/26/2008 
 
 
 
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