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Apache functions as a way to communicate over networks from client to server using the TCP/IP protocol. Apache can be used for a wide variety of protocols, but the most common is HTTP/S. HTTP/S or Hyper Text Transfer Protocol (S stands for Secure) is one of the main protocols on the web, and the one protocol Apache is most known for.

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Simply put, Apache HTTP server is a web server designed to serve static web pages. Whereas, Apache Tomcat is an application server built to serve java applications. Web pages can still be served through Apache Tomcat, but it will be less efficient than using an Apache HTTP server.

Jovan is a Cloud Security Engineer at Blackboard Insurance by day and freelance technical writer and consultant by night. Beginning his career at Apple as a Genius, he eventually found his way to NYC where he's spent the last 5 years wearing many hats from systems administrator to consultant. Jovan is passionate about automation, operations efficiency, user security, and streamlined workflows. Outside of work, Jovan enjoys photography, cooking, and film analysis.

I created a virtual environment with Python 3.5.2 and copied the traci_tls folder into it. From the terminal I can run sumo as well as sumo-gui with the file cross.sumocfg and that works.However when I try to run the runner.py file I get the following error message:

The SUMO_HOME environment variable points to /Users/Isabelle/sumo-0.28.0, which is where I installed SUMO. I have only this version of SUMO. I build the installation myself and it is configured with TRACI. If I type sumo in terminal from within the virtual environment it shows this information:

I have used TraCI and SUMO outside of the virtual environment before. That resulted in the same error but if I started the sumo-gui via the terminal before I ran runner.py it did work. However this fix does not work for me now that I am working within the virtual environment.

TraCI is the short term for "Traffic Control Interface".Giving access to a running road traffic simulation, it allows toretrieve values of simulated objects and to manipulate their behavior"on-line". If performance is an issue you should consider usinglibsumo instead. You can also start with TraCI and switchto libsumo later, since the function signatures are the same.

TraCI uses a TCP based client/server architecture to provide access tosumo. Thereby, sumo acts as serverthat is started with additional command-line options: --remote-port where is theport sumo will listen on for incoming connections.

When started with the --remote-port option, sumo only prepares thesimulation and waits for all external applications to connect and takeover the control. Please note, that the --end option is ignored whensumo runs as a TraCI server, sumoruns until the client demands a simulation end.

The number of clients which can connect can be given as an additionaloption --num-clients , where 1 is the default. Please note that in multi clientscenarios you must explicitly specify the execution order of the clientsusing theSetOrder-command.

The clients are automatically synchronized after every simulation step. This means, the simulation does not advance to the next step until all clients have called the 'simulationStep'' command. Also, the simulationStep command only returns control to the client after the simulation has advanced.

When using TraCI, the --end option of sumo is ignored.Instead the simulation is closed by issuing the closecommand.To detect whether all route files have been exhausted and all vehicleshave left the simulation, one can check whether the commandgetMinExpectedNumberreturns 0. The simulation will end as soon as all clients have sent theclose command.

Normally, TraCI is used to couple multiple processes: A SUMO serverprocess and one or more TraCI client processes. Alternatively,Libsumo can be used to embed SUMO as a libraryinto the client process. This allows using the same method signatures asin the client libraries but avoids the overhead of socket communication.Libsumo supports generating client libraries usingSWIG and can therefore be usedwith a large number of programming languages. C++, Java and Pythonbindings are included when downloading a sumo-build.

Please always consider using libsumo if performance is important.While it is much faster in general, not all optimizations mentioned below are applicable to libsumo as well.Especially subscriptions might even turn out to be slower.

Historically TraCI used a different (single byte) command ID for everydomain (induction loops, vehicle etc.) where the more significant halfof the byte denotes the command (get, set, subscribe, ...) and thelesser significant the domain itself. To allow more than the 16 domainsresulting from this split, the most significant bit (which was unuseduntil version 1.7.0 because there were only 7 commands) is now used for the domainas well (and only three for the command). This allows for 28 domainsbecause four general commands (like SIMSTEP) block some available combinations.Currently there are only four possible domains left.

Furthermore after the invention of libsumosome parts of the TraCI interface are so generic that it may be not sohard to invent a wrapper with Apache Kafka or Google protocol bufferswhich could in the long run replace the need for all the byte fiddlingand the different hand crafted clients.

This problem occurs if the client tries to access the output whilethe simulation is still closing down. This can be solved by lettingthe client wait for the simulation to shut down. The bug report was #524

There used to be two "generations" of TraCIcommands. The first one mainly uses an internal mapping between thestring-typed IDs used in sumo and an externalrepresentation of these which is int-based. The mapping was doneinternally (within TraCI).The second "generation", the current one uses string-IDs equal tothose sumo reads. If you are bound to the firstgeneration API (for instance if you want to use TraNS) you can onlyuse sumo up to version 0.12.3. SeeFAQ about obtaining an old version.

For sumo fans outside of Japan, there has been a sea change in the way we enjoy sumo. Many of us watched the lower divisions via a streaming TV service called Abema.tv, which we connected to via VPN that gave us a Japanese IP address. But it seems that Abema has decided to block VPN addresses from its service, and suddenly the normal ritual of tuning in during the late afternoon to catch the action in the lower divisions, up through Makushita was gone. I completely understand why they did it, and they own the rights to that content. They are fully justified to block foreign folks if that is what makes sense for their business. But for team Tachiai, we are sad to lose access to the lower divisions.

Coupled with Kintamayama going on holiday for a time, the number of ways a fan can get more than the basic NHK highlight reel are limited. For myself, I long ago subscribed to the NHK world wide feed, and I am privileged to have access to the full 2 hour Makuuchi broadcast each day (actually the middle of the night). I am incredibly thankful someone lets me buy this content, but as readers may have noticed, I have become a big fan of the Makushita top echelon, and there is simply no way to take that in now, short of going to Japan.

Like many sumo fans around the world, I suddenly found my evening free during Honbasho, and was unsure what to do. Of course the first 2 hours was spent madly trying to find a way to get the stream working, followed by expanded time with my family enjoying myself. I am sure at some point in the future, the hard-core sumo fans like myself will be granted some way to take in the full day of the basho. But until then, we are likely going to have to make do with whatever videos someone can sneak out onto platforms like YouTube and Vimeo.

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