RC

Roland

@Rconybea

New York City

Website

Joined August 2014

2 Followers

6 Following

AI Insights & Achievements

46/ 100

Consistency

42 day streak.

Veteran

Coding for 12 years.

Workhorse

1256 contributions this year.

Profile README

Hello, Roland here 👋

I'm Roland Conybeare, a software developer engaged in continuous learning.
Several decades of experience in the financial industry, working mostly in c++
Trying to solve problems so that they "stay solved" -- easier said than done!

Links

• website • linkedin •

Areas of Interest

Developer productivity. Member of the church of emacs. Trying to write better documentation.
Numerical programming. Kalman filters, PDE solvers, stochastic processes etc.
Performance oriented programming. For example low-latency schedulers, some lockfree algos.
Integration with REPL tools. Author of various scheme-based DSLs, more recently working with pybind11.

Projects

XO: a set of cooperating c++ libraries, with python bindings, for simuation and complex event processing.

| library | pybind | hdr-only | description | outside deps | |---------------------------------------------------------------------------|-------------------------------------------------------------------------------|----------|------------------------|---------------------| | xo-jit | xo-pyjit | | LLVM jit | llvm | | xo-expression | xo-pyexpression | | AST impl | | | xo-websock | xo-pywebsock | | websocket server | websockets, jsoncpp | | xo-kalmanfilter | xo-pykalmanfilter | | linear kalman filter | eigen | | xo-process | xo-pyprocess | | stochastic processes | | | xo-simulator | xo-pysimulator | | event-based simulation | | | xo-reactor | xo-pyreactor | | queueing system | | | xo-reflect | xo-pyreflect | | c++ reflection | | | xo-unit | xo-pyunit | Y | constexpr units | | | xo-ratio | | Y | constexpr exact ratios | | | xo-randomgen | | Y | xoshiro256** rng | | | xo-indentlog | | Y | structured logging | | | xo-flatstring | | Y | constexpr strings | |
nix-from-scratch: build+install nix+deps from source, without write access to /usr or /nix
cmake-examples: progressive series of cmake examples, starting from hello world.
docker-cpp-builder: example nix-built docker container for generic c++ builds
docker-nix-builder: example nix-built docker container (with nix made available at build time)
cleanmbox: automatically tidy email
.emacs setup: terse .emacs walkthrough; includes c++ lsp setup and org-mode publishing

Currently learning about

2024
- getting familiar with c++20/c++23 features; in particular constexpr, non-type template parameters, concepts.
- getting started with SIMD vector instructions, in particular AVX2
- getting started with llvm, via Kaleidoscope tutorial.
- documentation using doxygen + sphinx + breathe.
2023
- in-memory B-tree
- learning how to put nix to work, in particular for projects not present in nixpkgs.
- continuous integration using github actions.
- custom docker containers for github CI, automagically prepared via nix.
- diving into cmake, focusing on multi-repo builds
2022
- xoshiro256**; fast RNG.
- kalman filter using Eigen for matrix algorithms.
- websockets
- pybind11
once upon a time
- garbage collection algorithms.