Tracelogger is one of the tools JIT devs (especially me) use to look into performance issues and to improve the JS engine of Firefox performance-wise. It traces which functions are executing together with extra information like which engine is running. How long compilation took. How many times we are GC’ing and if we are calling VM functions …
I made the GUI a bit more powerful. First of all I moved the computation of the overview to a web worker. This should help the usability of the tool. Next to that I made it possible to toggle the categories on and off. That might make it easier to understand the graphs. I also introduced a settings popup. In the settings popup you can now choice to see absolute (cpu ticks) or relative (%) timings.
There are still a lot of improvements that are possible. Eventually it should be possible to zoom on graphs, toggle scripts on/off, see full times of scripts (instead of self time only) and maybe make it possible to show another graph (like a flame chart). Hopefully one day.
This is off course open source and available at:
https://github.com/h4writer/tracelogger/tree/master/website