In the early 2000’s I whipped up a tool to convert log statements into visual swim lanes like the Chrome profiler does. That thing was a godsend for reasoning about complex parallelism.
- Log4j + MDC's so we could get a timestamp and thread ID easily
- some python scripting
I can't remember if it was PDF or SVG, but I do remember having to choose something that would allow for huge graphs and lots of scrolling!
These days there's better options on github, but nice to see I was on a decent path.