[ndnSIM] How to get cache hit/miss ratio in a variable?

Tue Feb 17 00:41:02 PST 2015

Hi
Thank you. I will experiment further with exclusions. Btw is there any
function to remove certain entries from the content store manually?I can
use iterators to search the content store and I want a particular element
to be removed from the CS. There was one function remove entry but it was
commented out by default and was not implemented in the
content-store-impl.cc
Thank you

On Tue, Feb 17, 2015 at 12:47 PM, Spyridon (Spyros) Mastorakis <
spiros.mastorakis at gmail.com> wrote:

> Hello,
>
> more or less, this is how exclusion works. However, in the case that the
> consumer sends again an interest with prefix “/node8” and exclusion
> “/user”, the producer must not respond back with data for the name prefix
> “/node8/user”.
>
> As described in the NDN packet specification that I have already mentioned
> in a previous email and can be found here:
>
> http://named-data.net/doc/ndn-tlv/interest.html#exclude
>
> "The Exclude selectors allows requester to specify list and/or ranges of
> names components that MUST NOT appear as a continuation of the Name prefix
> in the responding Data packet to the Interest. For example, if Interest is
> expressed for /ndn/edu and Exclude specifies one name component ucla, then
> neither data producer nor conforming NDN routers are allowed to return any
> Data packet that has prefix /ndn/edu/ucla.”
>
> --
> Spyridon (Spyros) Mastorakis
> Personal Website: http://cs.ucla.edu/~mastorakis/
> Internet Research Laboratory
> PhD Computer Science
> UCLA
>
>
>
>
> > On Feb 16, 2015, at 11:00 PM, adithya srinivasan <adith.ad at gmail.com>
> wrote:
> >
> > Hi
> > Yes I'm creating my own custom producer application. But I'm not able to
> figure out how exclusion works. Can you atleast give a simple description
> like example? Assume that a consumer requests "/node8" , puts it in an
> interest and sends it. A producer replies back with "/node8/user". Now upon
> receiving this data , the consumer wants to exclude the "user" postfix and
> search for another "/node8". So he adds "/user" as an exclude filter and
> requests again? Is this how exclusion works?
> >
> > On Tue, Feb 17, 2015 at 7:44 AM, Spyridon (Spyros) Mastorakis <
> spiros.mastorakis at gmail.com> wrote:
> > Hello,
> >
> > based on my understanding of the scenario that you want to create, you
> do not need to worry about the minsuffixcomponent and maxsuffixcomponent
> selectors. However, you will need to create your own custom producer
> application (or modify the existing one) to handle the exclude selectors
> appropriately.
> >
> > --
> > Spyridon (Spyros) Mastorakis
> > Personal Website: http://cs.ucla.edu/~mastorakis/
> > Internet Research Laboratory
> > PhD Computer Science
> > UCLA
> >
> >
> >
> >
> > > On Feb 16, 2015, at 7:17 AM, adithya srinivasan <adith.ad at gmail.com>
> wrote:
> > >
> > > Hello
> > > Thank you for your reply. However i wasn't able to find a way to
> specify the minsuffixcomponents and maxsuffixcomponents. And also , can you
> provide me with an example of an application that uses exclude filters
> where the packets are excluded while the program is running.A very simple
> example will suffice. What I tried so far is , create a prefix , say ,
> "/node8" and add origins to that prefix to a node8 in the network. And then
> i added "user" as an exclude filter using the excludeOne() function. The
> onInterest() of node8 appends "user" to the dataname of the packet.So the
> name of the packet from producer becomes "/node8/user". Now as far as my
> understanding goes , this packet must be ignored since there is a match for
> the exclude filter. But the packet is being forwarded to the consumer.Can
> you point out where I am going wrong?
> > >
> > > P.S I also tried changing the source prefix as "/node8/user" and the
> consumer's interest prefix as "/node8" without any exclude filters. However
> there was no packet being transmitted. By longest prefix match , there
> should be a transmission of data packet from node 8 , shouldn't it be?
> > > Thank you
> > > Adithya
> > >
> > > On Sun, Feb 15, 2015 at 11:53 PM, Spyridon (Spyros) Mastorakis <
> spiros.mastorakis at gmail.com> wrote:
> > > Hello,
> > >
> > > please use the “reply to all” option, so that your emails are visible
> to all the users of ndnSIM.
> > >
> > > Exclude is a selector and refers only to a name prefix. You can take a
> look here for further information:
> > >
> > > http://named-data.net/doc/ndn-tlv/interest.html#selectors
> > >
> > > However, the FreshnessPeriod field of a data packet may be useful to
> you:
> > >
> > > http://named-data.net/doc/ndn-tlv/data.html#freshnessperiod
> > >
> > > Remember that if you want to use this field, the consumer has to
> request fresh data explicitly. This can be done with the MustBeFresh
> selector:
> > >
> > > http://named-data.net/doc/ndn-tlv/interest.html#mustbefresh
> > >
> > > --
> > > Spyridon (Spyros) Mastorakis
> > > Personal Website: http://cs.ucla.edu/~mastorakis/
> > > Internet Research Laboratory
> > > PhD Computer Science
> > > UCLA
> > >
> > >
> > >
> > >
> > > > On Feb 15, 2015, at 4:44 AM, adithya srinivasan <adith.ad at gmail.com>
> wrote:
> > > >
> > > > Hi
> > > > Thank you for your reply. Actually i thought initially that we can
> exclude a packet directly by specifying just the name of the packet. But i
> looked into the ndn-exclude files and found that exclusions can be made for
> the prefixes alone.Isn't that so? What I needed was the number of
> exclusions made by various users for a data packet in the Content Store of
> a router so that I can determine whether that packet is an important one or
> not.Suppose a user adds "/node0" as an exclusion in the interest , I want
> the number of exlcusions for "/node0" in the router's CS to be incremented
> by 1. I still don't know how to achieve this. Sorry I'm kind of a noob in
> this. Is there a way to get this?
> > > >
> > > > Thank you
> > > > Adithya
> > > >
> > > > On Sun, Feb 15, 2015 at 11:49 AM, Spyridon (Spyros) Mastorakis <
> spiros.mastorakis at gmail.com> wrote:
> > > > Hello,
> > > >
> > > > in order to get the cache hit/miss ratio in the desired format, you
> will need either to modify the implementation of the CS directly or the
> implementation of the cs tracer in order to return the desired parameter.
> > > >
> > > > For the other thing about the exclusions, Alex asked you to define
> more precisely the term “number of exclusions”. I would like to ask the
> same thing in order to really understand your question and be able to
> answer it.
> > > >
> > > > --
> > > > Spyridon (Spyros) Mastorakis
> > > > Personal Website: http://cs.ucla.edu/~mastorakis/
> > > > Internet Research Laboratory
> > > > PhD Computer Science
> > > > UCLA
> > > >
> > > >
> > > >
> > > >
> > > > > On Feb 13, 2015, at 11:08 PM, adithya srinivasan <
> adith.ad at gmail.com> wrote:
> > > > >
> > > > > Hello
> > > > > My project involves a basic level security algorithm against cache
> poisoning and pollution in NDN. For that I'm in need of the cache hit/miss
> ratio and also the exclusions made for a packet in the Content Store of a
> node. I've seen programs where the cache hit/miss ratio can be traced using
> tracers. But is there any way to obtain the cache hit/miss ratio of a node
> at any point of time inside a variable. I can use custom apps to create an
> instance for a node and is it possible to get the cache hit/miss ratio in
> that app?
> > > > >
> > > > > Thank you
> > > > > Adithya
> > > > > _______________________________________________
> > > > > ndnSIM mailing list
> > > > > ndnSIM at lists.cs.ucla.edu
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> > > >
> > > >
> > >
> > >
> >
> >
>
>
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