We use the waf build system. I'm trying to improve throughput/build time, especially when no changes were made. I have found the image generated by the parallel_debug plugin helpful (https://gitlab.com/search?search=parallel_debug&nav_source=navbar&project_id=7131569&search_code=true&repository_ref=master)
However! I see "blank areas" in my pdebug.svg image:
This is the profile from a "no changes" build. It took about 30s, 6 of which were a mystery. I'm interested in the blank area in the top row - what was waf doing during this time? Or does anyone have advice for what I could do to figure out what waf was doing?