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I have previously written about using a topological sort of a directed acyclic graph (DAG) of package dependencies to create an ordered list of installation operations. I now want to create a transitive reduction, giving a graph with the same vertices and the fewest number of edges possible.

Stepping into something different today for a Build Meetup hosted by Tweak, EngFlow and Jane Street at Jane Street’s London offices. I was quite involved with Jbuilder development and early work around Dune 1.0 and some early 2.x work, although it’s not a codebase I get to work on much these days. What was interesting for me, spending a lot of time in GNU make for the compiler, was to get some first-hand “big picture” experience from the talks and also a chance to catch-up with various OCaml people who can be remarkably hard to pin down.

Previously, I discussed the installation order for a simple directed acyclic graph without any cycles. However, opam packages include post dependencies. Rather than package A depending upon B where B would be installed first, post dependencies require X to be installed after Y. The post dependencies only occur in a small number of core OCaml packages. They are quite often empty and exist to direct the solver. Up until now, I had been using a base layer with an opam switch containing the base compiler and, therefore, did not need to deal with any post dependencies.

Buck2, Meta’s open source large-scale build system, is now publicly available via the Buck2 website and the Buck2 GitHub repository.

Memory issues can be hard to track down. A function that onlyallocates a few small objects can cause a space leak if it’s calledoften enough and those object...

Spacetime is a new memory profiling facility for OCaml to help find space leaksand unwanted allocations. Whilst still a little rough around the edges, we’vef...

I can't help but want to share my joy at coming across this pearl of a program from the "Pascal User Manual and Report" - Jensen and Wirth ...

A little bit about everything, but mostly about fixing annoying tech problems, interesting posts I stumbled on.

Here is a short report on some of our activities in April 2014, and a short analysis of OCaml evolution since its first release. OPAM Improvements We're still working on release 1.2. It was decided to include quite a few new features in this release, which delayed it a little bit since we want to be...