[GridSim-users] some questions

[Andrey N. <ne...@ma...>]

Hello, Anthony!
I have some questions about GridSim.

I've tried to make some test about files transfer  in GridSim. I've 
created two resources, 3 routers between (one direct link and one link 
through third router ), and one user on one of resource. Files were on 
one resource. User try to replicate files from Res_1 to res_2.
Config:

3
Router1
Router2
Router3
Router1 Router2 0.10 10.0 1500
Router1 Router3 1.2 10.0 1500
Router2 Router3 1.2 10.0 1500

Res1 25000 0.1 Router1 regionalRC1 File_name_0 File_name_1 File_name_2 
File_name_3 File_name_4 File_name_5 File_name_6 File_name_7 File_name_8 
File_name_9 Res2 20000 0.1 Router2 regionalRC1

user__Res1 Router1 regionalRC1
regionalRC1 0.10 Router1



Questions:
1. Is the any algorithm in GridSim to chose the "best" network way? 
because in my case simulator use only direct link Router1-Router2 
(100Mb/s) and not Router1-Router3-Router2 (1.2Gb/s).
2. Is the any relations between resources characteristic and file 
transfer time? Or file transfer time just depend on size of file and 
bandwidth?
3.  When I've tried to send 100Mb files through network with a different 
bandwidth (10Mb/s, 100Mb/s, 1000Mb/s) I always received the same time - 
something about 669. Why it is?
But when  I've tried to use the same bandwidth (100Mb/s) for different 
files (10Mb, 100Mb, 1000Mb),
i received the next time: 69.8; 669.8; 6669.8. And for transfer one file 
1000Mb I have to wait half an hour, it's to long can it be faster?!
As you said we couldn't have any correlation of this simulation time 
with the real, for example, we've got 6669.8 and it does not mean that 
real file would be transfered in 10 minutes. But what this time mean? 
just that something happened in this time?


Thanks in advance,  I hope you have time to answering me

Best regards, Andrey