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@kimwalisch

Kim Walisch

kimwalisch

Hi, I'm Kim.

In the late '90s when I was a teenager, I bought the book C++ for Kids because I wanted to program a 3D video game 👾🕹️. However unexpectedly, I ended up having much more fun with a simple program for generating prime numbers from that book. Ever since that time I have been writing programs and libraries for quickly 🚀 generating prime numbers in my sparse time.

My two main projects are primesieve and primecount. The development of primesieve started in 2010 and the development of primecount in 2013. Both primesieve and primecount have advanced the state of the art in their respective domains e.g. primecount contains many new improvements to the combinatorial prime counting algorithms. As of 2021 both of these projects are feature complete and now need to be maintained over time.

If you had fun using my programs and libraries, then you can say thank you by donating or sponsoring my maintenance work 🙏❤️

Just for fun

In 2020 I bought a dual-socket HPC server for computing prime counting function records. It has two AMD EPYC 7642 CPUs with a total of 96 CPU cores (192 threads) and 1 terabyte of ECC RAM! Initially I had bought a Supermicro server tower, but unfortunately the cooling of both the CPU and RAM was insufficient. So I transferred all components into a much larger gaming PC case which allowed me to install larger CPU heatsinks and more fans.

Current sponsors 1

@sethtroisi

Past sponsors 2

@entersoftone
Private Sponsor

Featured work

  1. kimwalisch/primesieve

    🚀 Fast prime number generator

    C++ 911
  2. kimwalisch/libpopcnt

    🚀 Fast C/C++ bit population count library

  3. kimwalisch/primecount

    🚀 Fast prime counting function implementations

    C++ 304
  4. kimwalisch/primesum

    🚀 Sum of the primes below x

    C++ 36
  5. ridiculousfish/libdivide

    Official git repository for libdivide: optimized integer division

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Your support will inflate my motivation and add some fun to the otherwise boring maintenance work. Thank you ❤️

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Your donation will be used to purchase one of the latest CPUs and tune primesieve & primecount for it and/or to rent cloud servers for testing.

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