I was writing up a bunch of arguments in favor of DOT (now deleted after reviewing the existing "analyze" output and how DOT would not be good for achieving it). But, I'd really prefer moving the output to something more semantic like callgrind [1] or HAR [2]. DOT is certainly more semantic than SVG, but it's nowhere near callgrind and HAR.
There are excellent utilities for rendering and browsing both callgrind and HAR formats. For callgrind, the utilities are so good that tools like XDebug for PHP use it for profiling output just so developers can use tools like KCacheGrind to browse the data. Seeing inclusive and exclusive times is great for understanding the effect of dependencies. An online tutorial [3] show some examples of browsing. HAR files also have multiple viewers. Our system startup profiling for achieving targets isn't really different from stages of rendering a web page (which are things like HTML downloaded, initial rendering, and completion of everything). Some online viewers [4] show examples. [1] http://valgrind.org/docs/manual/cl-format.html [2] http://www.softwareishard.com/blog/har-12-spec/ [3] http://freecadamusements.blogspot.com/2012/08/finding-bottleneck-using-kcachegrind.html [4] http://www.softwareishard.com/blog/har-viewer/ -- David Strauss | da...@davidstrauss.net | +1 512 577 5827 [mobile] _______________________________________________ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel
