Recent content on Paweł Dziepak
I have designed and built a distortion effect with input and output impedances as well as expected signal levels working well with synthesizers. It is very simple and minimalistic, but then again it doesn’t take much to distort a signal. Most of the design was done plugging simple models into SymPy and then using ngspice to verify the results. Assembled at home with an oven and some bad hand…
An RF signal at fixed frequency has amplitude and phase, so it can be represented or it can represent a complex number. Furthermore, microwave networks can be thought of as linear operations applied to those signals. When those networks are designed so that some of their parameters can be dynamically configured we can end up with a unitary matrix-complex vector multiplication. In this post I…
Not long ago, I put together a small library that provides an interface similar to the range-v3 library and uses CUDA to execute all operations on GPUs. I’ve implemented the basics: map, filter, reduce operations, just enough to serve as a proof of concept. In essence, it is quite similar to Thrust ; just the interface is different, based on ranges instead of iterators. As one would expect,…
Modern processors are quite complex, with many parts having the potential to become a bottleneck. It is relatively easy to reason about the performance of short pieces of code, especially if memory effects are kept to a minimum. Both static analysis tools like LLVM MCA and microbenchmarks can provide a lot of information in such cases. However, the behaviour of the whole program is not just the…
I’ve been writing a small library of intrusive data structures recently. Singly-linked and doubly-linked lists, being the simplest were also the first ones I implemented. Once I considered the potential for container-specific optimisations by specialising generic algorithms like for_each , transform , and accumulate I’ve realised that there is more to it than just the fact that…