POC: Replace Speedtracer with Opentracing.io

[Jens]

I stumbled upon opentracing.io some time ago and while it is primarily designed to trace distributed services you can also use it to trace a single process obviously. 

GWT compiler can produce speedtracer logs but you can not easily visualize them because the Chrome plugin does not work anymore. So I thought I give it a try and as a POC I have changed the implementation of the current speedtracer event API inside GWT compiler to record timings using opentracing.io API (just wanted to avoid updating lots of call sites). As a result I can now start SuperDevMode using some JVM system parameters like

-Dgwt.opentracing.tracerImpl=com.example.tracing.zipkin.ZipkinOpenTracingTracer (without it a NoopTracer will be used)

-Dzipkin.url=http://localhost:9411/api/v1/spans

-Dzipkin.serviceName=SuperDevMode

and launch a Zipkin server

docker run -d -p 9411:9411 openzipkin/zipkin

(or any other opentracing.io compatible server that stores and visualizes the timing information. You would need to implement a different Tracer then)

Now every time SDM compiles, all speedtracer events are converted into opentracing.io spans and you get some visualization like:

There are some rough edges to be solved, like a single recompile results in multiple traces not yet connected to each other, but I though I'll just share this quick POC with you.

Given the future of GWT 2.x I am not sure if it is worth investing more time in it but at least it shows that a relatively easy migration would be possible to some newer (standard) tools to visualize compiler timings again. So if we want to make speedtracer logs useable again this might be an option.

-- J.

[Goktug Gokdogan]

Nice!

But just FYI, I'm not sure how up to date the loggings in the compiler are so the results might be misleading.

--
You received this message because you are subscribed to the Google Groups "GWT Contributors" group.
To unsubscribe from this group and stop receiving emails from it, send an email to google-web-toolkit-contributors+unsubscribe@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/google-web-toolkit-contributors/f60836a4-4fa9-4d4a-b2db-182f8c1e3e38%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.