[Disksim-users] The question about Request Size in DiskSim/FlashSim

[Wei Wang]

average request size is calculated by the statistics of original trace. it
has nothing to do with the simulator.

Wei

On Sat, Jan 5, 2013 at 6:12 PM, 沈 <shzb89 at yahoo.cn> wrote:

> Hi,all.
> Recently,I use FlashSim to do some simulations. Now, I want to know the
> average request size of Financial1 trace. From the paper such as "WAFTL:
> A Workload Adaptive Flash Translation Layer with Data Partition","DFTL",they
> give the average request size, I don't know how they get the value.I have
> two ways to get the value, but I don't know if it is right.
> 1.From the output file of Flashsim, there are "Request size stats","Read
> Request size stats", "Write Request size stats",I can get the average value
> of average request size, I think the unit size is the same as the ascii
> trace, i.e.,512bytes(in the statdefs file, the Request size entry, the
> Scale is 1).
> 2.I get the value through caculate the average of the "bcount" in the
> trace.
> I don't know which is right.
>
> In addition, I found that the request size is just not the same as the
> bcount in the trace. For example,
> Overall I/O System Request size distribution
>    =  1    =  2    =  3    =  4    <  7    <  9    < 13    < 17    < 21
>   21+
>       0       0       0      24       0       0       0  158986  474238
>  422200
> but in Financial1 trace，after I convert it into the ascii format, the
> value of bcount can be 1,2,3,4 and so on. So the request size in
> DiskSim/FlashSim is not the same as the one in ascii trace, is that right?
> Can anyone help me? Thank you in advance.
>
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