Simon Willison’s Weblog


Wednesday, 24th July 2019

Repository driven development (via) I’m already a big fan of keeping documentation and code in the same repo so you can update them both from within the same code review, but this takes it even further: in repository driven development every aspect of the code and configuration needed to define, document, test and ship a service live in the service repository—all the way down to the configurations for reporting dashboards. This sounds like heaven. # 8:41 am

Using memory-profiler to debug excessive memory usage in healthkit-to-sqlite. This morning I figured out how to use the memory-profiler module (and mprof command line tool) to debug memory usage of Python processes. I added the details, including screenshots, to this GitHub issue. It helped me knock down RAM usage for my healthkit-to-sqlite from 2.5GB to just 80MB by making smarter usage of the ElementTree pull parser. # 8:25 am

Targeted diagnostic logging in production (via) Will Sargent defines diagnostic logging as “debug logging statements with an audience”, and proposes controlling this style if logging via a feature flat system to allow detailed logging to be turned on in production against a selected subset if users in order to help debug difficult problems. Lots of great background material in the topic of observability here too. # 5:44 am

2019 » July