Re: [ns] How to set InterPage interval depending on Page downloadtime!

[Xuan Chen <xuanc@ISI.EDU>]

At least for myself, I always open at least 2 browsers at the same
time...:)

Also, I think the exponetial distribution is a pretty reasonable model
for people's behavior in many cases, which actually determined by both
the thinking/reading time and page's download time. 

If you want to get the page's download time explicitly, you may need to
dig the Web traffic related code a little bit deeper.

Hope it helps,
-chen xuan

On Fri, 8 Jun 2001, Huan Pham wrote:

> 
> Hi,
> 
> In NS Web traffic library, the time between page requests is simulated
> as a random variable, independent of the page download time . It would
> be nicer if we somehow can take the download time into consideration.
> 
> In fact, usually each user usually have only one web browser at a time,
> and
> 
> InterPage interval = Page Download time + User's thinking time.
> 
> Where the User's Thingking time is a random variable.
> Page download time is not! It depends on the traffic load.
> 
> Does anyone have a way to get arround this problem, for example if we
> can get the Average Page Download time while in simulation, then we can
> set the average interPage time = Random variable + Average Page Download
> , rather than a fixed number.
> 
> 
> 
> set interPage [new RandomVariable/Exponential]
> # instead of using the following code
> # $interPage set avg_ 3
>                    ^^^^
> # we can use something like
> $interPage set avg_ [expr 3 + $average_delay]
>                                ^^^^^^^^^^^^^
> set pageSize [new RandomVariable/Constant]
> $pageSize set val_ 1
> set interObj [new RandomVariable/Exponential]
> $interObj set avg_ 0.01
> set objSize [new RandomVariable/ParetoII]
> $objSize set avg_ 10
> $objSize set shape_ 1.2
> $pool create-session 1 $numPage 0.2 $interPage $pageSize $interObj
> $objSize
> 
> 
> I would appreciate very much for your help.
> 

-- 
Xuan Chen
USC/ISI