[Disksim-users] Hello, some questions about disksim buffer. Thanks .

[Evan Jiang]

I tried the disksim v4.0. The content of my ascii trace file is as the
following:
13.191135  0   7777    5   1
 14.191135  0   7777    5   1
 15.191135  0   7777    5   1
 16.191135  0   7777    5   1
 17.191135  0   7777    5   1

All the requests is to read the blocks of the same position on disk. So the
number of buffer read hits should be 4, except the first one. However the
number of buffer accesses is 1 and hit ration is 0. The result is confusing.
Can anyone explain ? Thanks, I am looking forward to your reply. The DISK
STATISTICS is as the following.

Disk Number of buffer accesses:    1
Disk Buffer hit ratio:             0 0.000000
Disk Buffer miss ratio:                 1 1.000000
Disk Buffer read hit ratio:             0 0.000000 0.000000
Disk Buffer prepend hit ratio:            0 0.000000
Disk Buffer append hit ratio:            0 0.000000
Disk Write combinations:                0 0.000000
Disk Ongoing read-ahead hit ratio:      0 0.000000 0.000000
Disk Average read-ahead hit size:  0.000000
Disk Average remaining read-ahead: 0.000000
Disk Partial read hit ratio:      0 0.000000 0.000000
Disk Average partial hit size:     0.000000
Disk Average remaining partial:    0.000000
Disk Total disk bus wait time: 0.000000
Disk Number of disk bus waits: 0
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