ns-3

How to set up the position allocator when using Ramdomwaypoint model in NS-3

由 馋奶兔 提交于 2019-12-13 18:03:01
问题 I tried to alter the example code(third.cc) by replacing the mobility model name(RandomWalk2dMobilityModel) with RandomWaypointMobilityModel. After running the code, it turned out to be an output like assert failed. cond="m_position", msg="No position allocator added before using this model" So basically this is the most relevant code with the error msg MobilityHelper mobility; mobility.SetPositionAllocator ("ns3::GridPositionAllocator", "MinX", DoubleValue (0.0), "MinY", DoubleValue (0.0),

Kill the previous command in a pipeline

由 会有一股神秘感。 提交于 2019-12-12 08:56:03
问题 I am running a simulation like this ./waf --run scratch/myfile | awk -f filter.awk How can I kill the waf command as soon as filter.awk detects that something happened (e.g. after a specific line is read)? I cannot change waf or myfile . I can only change filter.awk , and the above command (obviously). Update after comments: waf does not terminated after receiving SIGPIPE (as it should?) It spawns child processes, that need cleaning up. This is my own answer (and challenge) . After working on

Network simulation tool supporting Bluetooth

由 …衆ロ難τιáo~ 提交于 2019-12-12 05:20:55
问题 We'd like to perform a Bluetooth network simulation. As far as we have researched, Bluetooth module has not been implemented in ns-3 and ns-2 modules recommended in this question have not been updated for years. We have not found any other simulation tool supporting this protocol apart from this mention to Qualnet, which I have not been able to verify on their website. Is there any current network simulation tool that includes a Bluetooth module or should we still use ns-2? 回答1: All the

Why are number of instructions non-deterministic in Linux performance counters

由 你说的曾经没有我的故事 提交于 2019-12-10 17:27:09
问题 To be able to profile application runtimes whose binaries will actually be run under a simulator (NS-3/DCE). I wanted to use the linux performance counters, I expected the instruction count for an application which has no source of non-determinism to be deterministic. I couldn't be more wrong according to the linux performance counters, let's take a simple example: $ (perf stat -c -- sleep 1 2>&1 && perf stat -c -- sleep 1 2>&1) |grep instructions 669218 instructions # 0,61 insns per cycle

Converting a string to uint8_t array in C++

由 余生长醉 提交于 2019-12-10 03:05:52
问题 I want an std::string object (such as a name) to a uint8_t array in C++. The function reinterpret_cast<const uint8_t*> rejects my string. And since I'm coding using NS-3, some warnings are being interpreted as errors. 回答1: If you want a pointer to the string 's data: reinterpret_cast<const uint8_t*>(&myString[0]) If you want a copy of the string 's data: std::vector<uint8_t> myVector(myString.begin(), myString.end()); uint8_t *p = &myVector[0]; 回答2: String objects have a .c_str() member

How do I implement multicast dynamic join/prune using ns3

由 自作多情 提交于 2019-12-08 10:38:20
问题 Is there a way to implement the dynamic prune/graft of nodes in a multicast network using ns3. The resources I could find all implements only static routing for multicast networks. 回答1: Referencing this: http://www.nsnam.org/docs/release/3.16/doxygen/classns3_1_1_ipv4_static_routing_helper.html#ae69a07ded3139dfd4e21bb7c10eba416 In ns-3 we set a default multicast route for the node's routing table executing SetDefaultMulticastRoute(dev,nd) , which as the documentation states is equivalent to

ns-3 wlan grid TCP not working while UDP is

由 帅比萌擦擦* 提交于 2019-12-07 20:06:44
问题 I am trying to set up a Multihop AdHoc 802.11g Network in ns-3. To get started I used the example 'wifi-simple-adhoc-grid.cc'. The example uses UDP, but I want to use TCP. Therefore I switched TypeId tid = ns3::UdpSocketFactory::GetTypeId(); Ptr<Socket> recvSink = Socket::CreateSocket (c.Get (sinkNode), tid); InetSocketAddress local = InetSocketAddress (Ipv4Address::GetAny (), 80); recvSink->Bind (local); recvSink->SetRecvCallback (MakeCallback (&ReceivePacket)); to TypeId tid = ns3:

Converting a string to uint8_t array in C++

由 与世无争的帅哥 提交于 2019-12-05 03:04:53
I want an std::string object (such as a name) to a uint8_t array in C++. The function reinterpret_cast<const uint8_t*> rejects my string. And since I'm coding using NS-3, some warnings are being interpreted as errors. If you want a pointer to the string 's data: reinterpret_cast<const uint8_t*>(&myString[0]) If you want a copy of the string 's data: std::vector<uint8_t> myVector(myString.begin(), myString.end()); uint8_t *p = &myVector[0]; String objects have a .c_str() member function that returns a const char* . This pointer can be cast to a const uint8_t* : std::string name("sth"); const

what if notify() is called before wait()?

由 别说谁变了你拦得住时间么 提交于 2019-12-04 17:32:58
问题 I have a situation where a notify() 'can' be called before a wait(). I am trying to make a simulator to schedule its next event when I 'notify' him by sending him messages. So I have devised a wait->notify->scedule chain void Broker::pause() { boost::unique_lock<boost::mutex> lock(m_pause_mutex); { std::cout << "pausing the simulation" << std::endl; m_cond_cnn.wait(lock); std::cout << "Simulation UNpaused" << std::endl; // the following line causes the current function to be called at // a

Kill the previous command in a pipeline

由 坚强是说给别人听的谎言 提交于 2019-12-04 12:35:35
I am running a simulation like this ./waf --run scratch/myfile | awk -f filter.awk How can I kill the waf command as soon as filter.awk detects that something happened (e.g. after a specific line is read)? I cannot change waf or myfile . I can only change filter.awk , and the above command (obviously). Update after comments: waf does not terminated after receiving SIGPIPE (as it should?) It spawns child processes, that need cleaning up. This is my own answer (and challenge) . After working on @thatotherguy's ans @Chris's answers, I simplified a bit and got this: tmp=$(mktemp) { ./waf --run
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