[ndnSIM] leaky bucket start time

[Yaogong Wang]

Sounds like a good compromise. Thanks, Alex.

Yaogong

On Wed, Feb 13, 2013 at 2:30 PM, Alex Afanasyev <
alexander.afanasyev at ucla.edu> wrote:

> I see. Yeah, 1 second randomization could be a bad choice (any small
> randomization would be sufficient), but I wouldn't rely too much on users
> to take care of that.
>
> I can actually put a configurable option to enable/disable this
> randomization, as well as to configure randomization interval, keeping it
> ON by default with 1 ms randomization interval.
>
> ---
> Alex
>
> On Feb 13, 2013, at 11:23 AM, Yaogong Wang <ywang15 at ncsu.edu> wrote:
>
> I see your point. Such kind of synchronization could lead to some
> simulation artifacts. But I believe this should be taken care of by the
> users. They should be aware of this (such synchronization problems could
> happen in any simulator) and incur some randomness in their simulation
> setup.
>
> My concern with the current implementation is that the leak start time is
> randomly picked between 0s and 1s. It is fairly possible that lots of
> packets have already been sent before the leak start time. These packets
> may get stuck in the network because the bucket didn't start leaking when
> it should have. This might not be a big issue most of the time but did
> cause me some headache in some particular setup.
>
> Thanks,
> Yaogong
>
> On Wed, Feb 13, 2013 at 1:57 PM, Alex Afanasyev <
> alexander.afanasyev at ucla.edu> wrote:
>
>> True. But if two guys receive a packet at the same time (can happen in
>> some simple topologies), they would start leaking at the same time,
>> resulting in synchronized decision, which may lead to unexpected results (I
>> had them with simplistic topologies).
>>
>> ---
>> Alex
>>
>> On Feb 13, 2013, at 10:39 AM, Yaogong Wang <ywang15 at ncsu.edu> wrote:
>>
>> It doesn't seem to make much sense. The bucket anyway starts out as
>> empty. Leaking won't really happen until someone calls BorrowLimit().
>>
>> Yaogong
>>
>> On Wed, Feb 13, 2013 at 1:17 PM, Alex Afanasyev <
>> alexander.afanasyev at ucla.edu> wrote:
>>
>>> Hi!
>>>
>>> I've put it there to ensure that nodes don't make a synchronized leaks
>>> of buckets, which impossible in real life, but could happen in some cases
>>> in the simulations.
>>>
>>> ---
>>> Alex
>>>
>>>
>>> On Feb 13, 2013, at 9:45 AM, Yaogong Wang <ywang15 at ncsu.edu> wrote:
>>>
>>> > Hi,
>>> >
>>> > I'm curious why do we randomize the leak start time in
>>> LimitsRate::NotifyNewAggregate() under untils/ndn-limits-rate.cc. Why can't
>>> we just start leaking at 0.0?
>>> >
>>> > Thanks,
>>> > Yaogong
>>>
>>
>>
>>
>> --
>> ============================
>> Yaogong Wang, PhD Candidate
>> Department of Computer Science
>> North Carolina State University
>> http://www4.ncsu.edu/~ywang15/
>> ============================
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>>
>>
>>
>
>
> --
> ============================
> Yaogong Wang, PhD Candidate
> Department of Computer Science
> North Carolina State University
> http://www4.ncsu.edu/~ywang15/
> ============================
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>
>


-- 
============================
Yaogong Wang, PhD Candidate
Department of Computer Science
North Carolina State University
http://www4.ncsu.edu/~ywang15/
============================
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