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Parsimoni has been selected for Techstars' autumn 2025 space accelerator programme!

Over the summer, Lucas Ma has been investigating ideas surrounding using effects in the OCaml compiler itself. He’s blogged some of his discoveries and adventures. The technical core of this work leads towards being able to use the OCaml compiler as a library on-demand to create a longer-lived “compiler service”. Of itself, that’s not at all revolutionary, but it is quite hard to do that with a 30 year old codebase that really was designed for single-shot separate compilation.

Building a comprehensive database testing suite for Chaufr: integration tests, transaction verification, migration rollback testing, connection pool stress tests, and performance benchmarks using Alcotest, Lwt, and Caqti

If you haven’t discovered the Apache Parquet file format, allow me to introduce it along with ClickHouse.

Yesterday I wrote about the amazing performance of Apache Parquet files; today I reflect on how that translates into an actual application reading Parquet files using the OCaml wrapper of Apache’s C++ library.

FreeBSD Jails provide isolated system containers that are perfect for CI testing. Miod ported OBuilder to FreeBSD back in 2023. I have been looking at some different approaches using unionfs.

I’ve been largely steering clear of the AI bandwagon up to now, mainly because the last thing I needed while working on Relocatable OCaml was to be trying to learn a new tool at the same time as finishing something which felt desperately late and which, at times, I myself didn’t fully understand! However, as the buzz of the announcement dies down, I had a first go at pointing Claude Code to the OCaml compiler codebase, and thought I’d add to the general noise of AI memoirs…