SCCS Colloquium

The SCCS Colloquium is a forum giving students, guests, and members of the chair the opportunity to present their research insights, results, and challenges. Do you need ideas for your thesis topic? Do you want to meet your potential supervisor? Do you want to discuss your research with a diverse group of researchers, rehearse your conference talk, or simply cheer for your colleagues? Then this is the right place for you (and you are also welcome to bring your friends along).

Upcoming talks

Anish Acharya: A high performance expression evaluation engine for an analog circuit simulator

SCCS Colloquium |


In modern analog circuit simulation, the topology and behavior of circuits are usually described in the form of netlists, where the parameters of the simulated devices can be specified as fixed numbers as well as dynamic expressions. Especially in modern technology nodes, these expressions are used exhaustively to model even the smallest physical effects, i.e., the expressions define the characteristics of the circuit elements. These characteristics can depend on the circuit variables, which are the unknowns of the simulation. These expressions are interpreted in each simulation loop during the circuit simulation to determine the correct parameter values. Unfortunately, this interpretation of expressions is a performance bottleneck.

This thesis investigates various approaches to expression evaluation in the context of a circuit simulator. It introduces a Just-in-Time (JIT) compilation approach for compiling expressions to machine code for evaluations. As a first step, an expression evaluation engine has been developed as an independent library. The engine provides infrastructure for parsing using the C++ library PEGTL, semantic analysis, type inference, LLVM-IR code generation, JIT compilation using LLVM Orc JIT, and JIT-compiled function calls using libffi. Afterwards, the expression evaluation engine is integrated into a SPICE-based analog circuit simulator. Finally, for a set of test circuits, the runtime performance of the circuit simulator with the expression evaluation engine is compared. The benchmark results show that for setup with profuse use of dynamic expressions, there is up to 45% speedup in the total simulator runtime.

Master's thesis presentation. Anish is advised by Dr. Christoph Kowitz and Prof. Michael Bader.


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Contribute a talk

To register and schedule a talk, you should fill the form Colloquium Registration at least two weeks before the earliest preferred date. Keep in mind that we only have limited slots, so please plan your presentation early. In special cases, contact colloquium@mailsccs.in.tum.de.

You can try the platform beforehand using Try BigBlueButton, or by starting your own room at the RBG BBB. For troubleshooting, you could also try the WebRTC Troubleshooter.

Note: Starting from October, Colloquium sessions will be on-campus. We have booked room MI 00.13.054. You can either bring your own laptop (please bring your own adapters) or send us the slides as a PDF ahead of time.

We invite students doing their Bachelor's or Master's thesis, as well as IDP, Guided Research, or similar projects at SCCS to give one 20min presentation to discuss their results and potential future work. The time for this is typically after submitting your final text. Check also with your study program regarding any requirements for a final presentation of your project work.

New: In regular times, we will now have slots for presenting early stage projects (talk time 2-10min). This is an optional opportunity for getting additional feedback early and there is no strict timeline.

Apart from students, we also welcome doctoral candidates and guests to present their projects.

During the colloquium, things usually go as follows:

  • 10min before the colloquium starts, the speakers setup their equipment with the help of the moderator. The moderator currently is Irene López. Make sure to be using an easily identifiable name in the online session's waiting room.
  • The colloquium starts with an introduction to the agenda and the moderator asks the speaker's advisor/host to put the talk into context.
  • Your talk starts. The scheduled time for your talk is normally 20min with additional 5-10min for discussion.
  • The moderator keeps track of the time and will signal 2min before the end of time (e.g. by turning on their video).
  • During the discussion session, the audience can ask questions, which are meant for clarification or for putting the talk into context. The audience can also ask questions in the chat.
  • Congratulations! Your talk is over and it's now time to celebrate! Have you already tried the parabolic slides that bring you from the third floor to the Magistrale?

Do you remember a talk that made you feel very happy for attending? Do you also remember a talk that confused you? What made these two experiences different?

Here are a few things to check if you want to improve your presentation:

  • What is the main idea that you want people to remember after your presentation? Do you make it crystal-clear? How quickly are you arriving to it?
  • Which aspects of your work can you cover in the given time frame, with a reasonable pace and good depth?
  • What can you leave out (but maybe have as back-up slides) to not confuse or overwhelm the audience?
  • How are you investing the crucial first two minutes of your presentation?
  • How much content do you have on your slides? Is all of it important? Will the audience know which part of a slide to look at? Will somebody from the last row be able to read the content? Will somebody with limited experience in your field have time to understand what is going on?
  • Are the figures clear? Are you explaining the axes or any other features clearly?

In any case, make sure to start preparing your talk early enough so that you can potentially discuss it, rehearse it, and improve it.

Here are a few good videos to find out more:

Did you know that the TUM English Writing Center can also help you with writing good slides?

Work with us!

Do your thesis/student project in Informatics / Mathematics / Physics: Student Projects at the SCCS.