[Disksim-users] some questions about using disksim4.0

[Anjo Vahldiek]

Hi,

I can only help you with the first issue. Please have a look at the 
.parv file you are using.

disksim_global Global {
   Init Seed = 42,
   Real Seed = 42,
   Stat definition file = statdefs
   Detailed execution trace = exectrace
}

The last option generates the information you want to know about how 
long every request took on a per request basis. It writes it into the 
file you provide as an argument.

It does not include whether or not an access was cached, but you can 
tell from the time it took to process the request. If a request has 0 
response time it is very likely that it was cached.

Anjo

On 03/04/2012 02:31 PM, 代成俊 wrote:
>
>
>
> Thanks for your reply and wonderful explanation.
>
>>> 1,What should I do to get the response time and hitting situation of per request?
>> I obtained the response time by modifying the source code. When a
>> request is serviced, disk_acctimestats() is called. I got the response
>> time by subtracting the current timestamp (i.e. disksim->simtime) by
>> the arrival time of the request. You may need to modify Disksim to
>> carry the arrival time from the I/O driver down to the disk
>>
>> "hitting situation"? Do you mean the cache hit/miss?
> I have tried it as your said steps, but failed. disk_acctimestats() is only
> called 88733 times(100000 Requests total), and it only have access time,
> where could I get the current timestamp? what does the meaning of "You
> may need to modify Disksim to carry the arrival time from the I/O
> driver down to the disk"? The arrival time should be the time arrival disk?
>
> Overall I/O System Total Requests handled:    99997
> Overall I/O System Requests per second:       65.231783
> Overall I/O System Completely idle time:      534035.035583       0.348371
> Overall I/O System Response time average:     33.897219
> Overall I/O System Response time std.dev.:    34.852530
> Overall I/O System Response time maximum:    335.193345
>
> This is part of output result of my experiment,In my opinion, the
> "Response time" here shoud be a time range from request arriving
> subsystem to Service completion, is is right? How can I get this
> response time for per request?
>
> Could you sent me a copy of the disksim version(or source files)
> which had been modified exactly to output the respnse time
> for per request? Thank you very much.
>
> Yes, I mean cache hit/miss.
>
>
>>> 3,The ascii.trace in the valid folder has 100000 requests, but when I run disksim ascii.parv stdout ascii ascii.trace 0,
>>> there was only 99993 requests were handled(I have modified the system topology and iomap),Why lost seven request?
>> as I remember from Disksim 3.0, when the trace runs out,
>> disksim->stop_sim is set to TRUE to stop the simulation, which is
>> before all requests are serviced. I believe that's the reason.
> I see, but what was the reason for the trace runs out? How can I avoid
> this?
>
> Best wishs.
>
> ChengJun Dai.
> 2012-3-4
>
>
>> On Sat, Mar 3, 2012 at 7:43 PM, 代成俊<dcjy at mail.ustc.edu.cn>  wrote:
>>> Dear Sir(Miss):
>>>      I am using disksim(V4.0). My work is to use disksim to simulate one disk(SEAGATE_ST32171W) subsystem.
>>> The system topology is just like this:
>>>
>>> # system topology
>>> topology disksim_iodriver driver0 [
>>>    disksim_bus bus0 [
>>>       disksim_ctlr ctlr0 [
>>>          disksim_bus bus1 [
>>>             disksim_disk disk0 []
>>>          ] # end of bus1
>>>       ] # end of ctlr0
>>>    ] # end of bus0
>>> ] # end of system topology
>>>
>>> My input is a a series of requests(Request arrival time,Device number,Block number,Request size,Request flags)
>>> in a ascii file. The output I want to get is the response time per request and the situation of per request
>>> hit cache, but the disksim only output the statistic information of all requests. so I want to consult some questions
>>>
>>> 1,What should I do to get the response time and hitting situation of per request?
>>>
>>> 2,The default input format is a simple ASCII stream (or file),which is the unit of "Request arrival time" and
>>> "Request size",Seconds milliseconds or microseconds? KB or block?
>>>
>>> 3,The ascii.trace in the valid folder has 100000 requests, but when I run disksim ascii.parv stdout ascii ascii.trace 0,
>>> there was only 99993 requests were handled(I have modified the system topology and iomap),Why lost seven request?
>>>
>>> Sorry for the my poor english,thank you.
>>>
>>> Best wishs.
>>>
>>> ChengJun Dai.
>>> 2012-3-4
>>> _______________________________________________
>>> Disksim-users mailing list
>>> Disksim-users at ece.cmu.edu
>>> https://sos.ece.cmu.edu/mailman/listinfo/disksim-users
>>>
>>
>>
>> -- 
>> ********************************************
>> Yipkei Kwok
>> Ph.D. Student
>> Research Assistant
>> HiPerSys Lab
>> Department of Computer Science
>> The University of Texas at El Paso
>> Phone: 915 747 6433 (O)
>> E-mail: ykwok2 at miners dot utep dot edu
>> ********************************************
>>
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