Hi,
I did a trial run (small data set size of 400KB) with iolog enable so
to capture the offset. From what i can see, the offset is indeed
randomly selected.
occurrence | offset
10 16384
1 45056
13 77824
4 110592
2 139264
47 172032
5 204800
1 233472
1 266240
11 299008
2 331776
3 393216
Do correct me if i am wrong.
Cw
On Tue, May 30, 2017 at 2:46 PM, qingwei wei <tchengwee@xxxxxxxxx> wrote:
> Hi,
>
> I would like to validate my understanding on fio zipfian
> random_distribution. Form my understanding, a zipfian 1.2 means ~95%
> of IO access will be concentrated on 5% offset location (Do correct me
> if i am wrong). So if i have a file with 100 offsets, i cold have
> offset 1, offset 5, offset 20, offset 86, offset 99 get repeatedly
> access. So my question is, is this offset being chosen randomly? Or is
> it possible to specify based on spatial locality, where nearby offset
> tend to be accessed together? Thanks.
>
> Cw
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