panthema / 2018
First slide of the talk

Dissertation Defense Presentation "Scalable String and Suffix Sorting: Algorithms, Techniques, and Tools"

Posted on 2018-07-03 18:00 by Timo Bingmann at Permlink with 1 Comments. Tags: talk university dissertation

The road to a Dr. title (PhD in the Anglo-Saxon world) is often long, rough, and twisted. First you have to do original research, produce novel results, publish articles, and then write and ultimately publish a dissertation. Defending your research in the dissertation in front of a panel of professors is one of the final milestones on that journey.

Today, I successfully defended my dissertation at the Karlsruhe Institute of Technology and it will be published soon as a book.

The slides of my presentation during the defense are available for download below:
dissertation-defense-slides.pdf dissertation-defense-slides.pdf.

The presentation was only part of the whole defense. My actual slide set also had almost 200 more backup slides, which however were collected from all the other talks already available on this homepage.

Download dissertation-defense-slides.pdf

TLX Logo

Note about the new tlx library of Advanced C++ Data Structures and Algorithms

Posted on 2018-05-28 18:20 by Timo Bingmann at Permlink with 0 Comments. Tags: c++

Last year on February 19th, I started a new github repository called tlx with the goal of de-duplicating code from three projects: Thrill, STXXL, and a private project. The idea came up after a STXXL code workshop in Frankfurt (fashionably called hackathons nowadays).

Link to library: http://github.com/tlx/tlx and Doxygen Documentation

The first main common pieces of code were:

  1. the fast loser tree implementations from MCSTL by Johannes Singler necessary for efficient multiway merging,
  2. my die() macros for testing and run-time assertions,
  3. a common intrusive reference counter called counting_ptr, and
  4. simple but vital std::string manipulation functions missing from the STL.

The initial reason for tlx to come about was to consolidate all the bug fixes to the loser tree implementations that I had scattered across the three projects. Efficient multiway merging is such a fundamental task and there was no universally available C++ library that implements the tournament tree well.

A long search for an appropriate vacant user account with three letters on github lead to "tlx". This is definitely a good C++ namespace name, but to this day, it is unclear what the letters stand for. Template Libraries for CXX? The missing Library for CXX? Template Library and more eXtensions. Have your pick, someday someone will find a good official expansion.

Since its inception, tlx has grown a lot. Its goal is to consolidate algorithms and data structures from multiple projects. In a sense tlx maybe aims to be the Boost for advanced algorithms. The goals and constraints of tlx are:

Currently, tlx contains

And much more, which one can find on the front page of the Doxygen Documentation

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