[Mini-NDN] Cannot add FIB entry /localhost/nfd (10060 request timed out)

[Saurab Dulal (sdulal)]

Hi Jaicheng,

Mini-NDN is an emulator toot, not a simulator. It runs real instances of NDN packages i.e. nfd, nlsr, sync and so on. So, it won't run faster than the real instances, give and take a few milliseconds. There is a limit on how faster you can add prefix to the current nfd (see the Redmine issues referenced below). If you want to simulate your experiments, you can use ndnSIM (https://ndnsim.net/current/).

Mini-NDN uses nfdc wrapper to add prefixes https://github.com/named-data/mini-ndn/blob/master/minindn/helpers/nfdc.py.

You can increase the sleep time here: https://github.com/named-data/mini-ndn/blob/master/minindn/helpers/nfdc.py#L27. But this will slow down your experiment by the multiple of sleep time and prefix count.

Saurab,
________________________________
From: JIACHENG HOU <houdemi at outlook.com>
Sent: Wednesday, January 13, 2021 4:22 PM
To: Saurab Dulal (sdulal) <sdulal at memphis.edu>
Subject: Re: Cannot add FIB entry /localhost/nfd (10060 request timed out)


Hi Sdulal,



Thanks for your reply.



I'm still confused, I'm speeding up the simulation time based on intercepting the system's calls to the current date and time. According to my understanding, all programs in Mini-NDN run faster than real-time. However, I always get the error message "Cannot add FIB entry/localhost/nfd(10060 request timed out)". Is it possible that nfd is not running faster?



Furthermore, which function is used to register prefixes in Mini-NDN? Should I add a delay time in the following Face::registerPrefix function in ndn-cxx/face.cpp?



RegisteredPrefixHandle

Face::registerPrefix(const Name& prefix,

                     const RegisterPrefixSuccessCallback& onSuccess,

                     const RegisterPrefixFailureCallback& onFailure,

                     const security::SigningInfo& signingInfo,

                     uint64_t flags)

{

  std::this_thread::sleep_for (std::chrono::seconds(2)); // add delay time

  nfd::CommandOptions options;

  options.setSigningInfo(signingInfo);



  auto id = m_impl->registerPrefix(prefix, onSuccess, onFailure, flags, options, nullopt, nullptr);

  return RegisteredPrefixHandle(m_impl, id);

}



Sorry to ask such a silly question. Thank you very much for your help!



Best wishes,

Jiacheng





From: "Saurab Dulal (sdulal)" <sdulal at memphis.edu>
Date: Tuesday, January 12, 2021 at 9:41 PM
To: "mini-ndn at lists.cs.ucla.edu" <mini-ndn at lists.cs.ucla.edu>, JIACHENG HOU <houdemi at outlook.com>
Subject: Re: Cannot add FIB entry /localhost/nfd (10060 request timed out)



You need to some delay in-between adding the prefixes to the NFD otherwise you get a request timeout. Please have a look at the issue: https://redmine.named-data.net/issues/2174. Since you are adding the prefix 100 times faster, the limit is exceeded and thus you are getting the timeout.



With Regards,

Saurab Dulal

________________________________

From: Mini-NDN <mini-ndn-bounces at lists.cs.ucla.edu> on behalf of JIACHENG HOU via Mini-NDN <mini-ndn at lists.cs.ucla.edu>
Sent: Tuesday, January 12, 2021 3:10 PM
To: mini-ndn at lists.cs.ucla.edu <mini-ndn at lists.cs.ucla.edu>
Subject: [Mini-NDN] Cannot add FIB entry /localhost/nfd (10060 request timed out)



CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and trust the content is safe.



Hi Mini-NDN teams,



I am Jiacheng. I try to use libfaketime to speed up the mini-ndn simulation to faster than real-time.



I try a simple topology which contains 7 nodes in Mini-NDN. When I speed up 10 times faster than real time, mini-ndn works well. However, when I speed up 100 times faster, it always shows this error message:



1610485895.599211 FATAL: [nfd.Main] ../daemon/mgmt/rib-manager.cpp(212): Throw in function operator()

Dynamic exception type: boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<nfd::ManagerBase::Error> >

std::exception::what: Cannot add FIB entry /localhost/nfd (10060 request timed out)



What’s the reason for this? Any idea would be appreciated.



Best wishes,

Jiacheng
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.lists.cs.ucla.edu/pipermail/mini-ndn/attachments/20210118/de1b1964/attachment.html>