p2psp team mailing list archive

[Ilshat Shakirov <im.shakirov@xxxxxxxxx>]

Hello!,

Sorry for the delay in the response.
I have just improved the Peersim impl of P2PSP:
- malicious peer connects to the team after some delay (magic constant :))
- *CHUNK *message have 4 times more delay than other messages (hello,
goodbye, etc.)
- trusted and malicious peers are chosen randomly at the begin of simulation

I have performed new experiments with these improvements, it can be
accessed at the same doc -
https://docs.google.com/spreadsheets/d/1pc6yb87xJy8gNkWSWvvCvjAjR6WBFdOzCbPvO-zEooU/edit#gid=0
- it has 2 new tabs - raw2 and result2.
*raw2 *tab have 2 sets of data - the first one was performed without
different latencies, and the second one was performed with different
latencies.
Could you please evaluate results? What the next steps you want to see with
peersim impl of p2psp? =) I want to perform experiments with different
numbers of trusted peers and attackers, in order to confirm theroretical
analysis given in paper.

Also, I want to store all the logs from each experiment in the same place.
I want to use dropbox for this (shared dir). What do you think? =)

Currently, Im preparing scripts (bash and bat) to run simulation, so there
will be possible to perform experiments without setting up IDE.

ps Could you please include me to sim project on github? Or we will work
with pull requests? =)

Thanks in advance!


2015-03-20 18:48 GMT+06:00 Vicente Gonzalez <vicente.gonzalez.ruiz@xxxxxxxxx
>:

>
>
> 2015-03-20 9:59 GMT+01:00 Ilshat Shakirov <im.shakirov@xxxxxxxxx>:
>
> I don't know the procedure you are using to add peers to a team (how the
>>> peers contact the splitter, receives the list of peers of the splitter and
>>> send the [hello] message to the peers that are in the list), but I suppose
>>> that this procedure is similar to one used in a real team.
>>
>> Yes, the peers are added to team as it described in DBS of rules (new
>> peer sends HELLO to splitter, splitter sends list of peers, peer sends
>> HELLO to rest of team).
>>
>
> OK.
>
>
>> I have new hypothesis - how much time is spent for sending chunks? and
>> for sending simple messages, like HELLO/GOODBYE. In peersim implementation
>> there is no difference in times between these two types of message. If it's
>> able to send 2 or more simple messages while one chunk is sending, then
>> simulation results will match with expected results.
>>
>
> When a peer is introducing himself to the rest of the team only sends
> [hello]s. To interlace [hello]s and chunks, the splitter should send first
> to it a chunk, and this is done after receiving the list of peers from the
> splitter. This does not happen.
>
> In my opinion, a better result (not only for this experiment) could be
> obtained if you assign a latency to each message that depends on the
> message's length.
>
>
>> This means that if the peer 34 were the trusted peer, the attacker would
>>> send only one poisoned chunk before it is reported. For this reason, I
>>> think that the order of the peers in the lists should have some influence
>>> in the average number of poisoned chunks.
>>
>> There is such results already. I.e. cell D43 in google sheet
>> <https://docs.google.com/spreadsheets/d/1pc6yb87xJy8gNkWSWvvCvjAjR6WBFdOzCbPvO-zEooU/edit#gid=0>.
>>
>>
>
> I see :-)
>
>
>>
>> Also, I can remove the latency for simple messages (like hello and
>> goodbye), and (I suppose) results will match with expected results.
>>
>
> No. Please, consider first my idea (longer messages will take more time
> traveling that shorter ones).  And, randomize, if possible, the order (or
> time) in which peers join the team.
>
>
>>
>> An accurate P2PSP simulator is very interesting for researching the
>>> performance of the P2PSP. Any kind of advance/facility in this direction is
>>> really appreciated :-)
>>
>>
>
>> Ok, I will begin to write readme file about performing experiments =)
>>
>
> Again, thanks. Your work will be very helpful!!
>
> Best,
> Vi.
>
> --
> Vicente González Ruiz
> Depto de Informática
> Escuela Técnica Superior de Ingeniería
> Universidad de Almería
>
> Carretera Sacramento S/N
> 04120, La Cañada de San Urbano
> Almería, España
>
> e-mail: vruiz@xxxxxx
> http://www.ual.es/~vruiz
> tel: +34 950 015711
> fax: +34 950 015486
>