CodeTools proposal: "fjptrace"

[Aleksey Shipilev]

Tool Name:
Java Fork/Join Trace (fjptrace)

Tool Purpose:
Java Fork/Join Trace (fjptrace) is an instrumented ForkJoinPool
implementation that produces the event trace, plus a set of trace
visualizers.

Proposed By:
Aleksey Shipilev, Oracle, Java SE Performance team

Rationale:
Java Fork/Join Trace is a tool to understand the end-to-end behavior of
java.util.concurrent.ForkJoinPool (FJP). It was a foundational tracing
tool that exposed problems and outlined the solutions in FJP during the
early Project Lambda work.

Since FJP became implicitly exposed to users as the executor for
Parallel Streams in JDK 8, some users started to have problems following
up on performance problems.

With fjptrace as part of the OpenJDK CodeTools Project, we can provide
the tooling to let users introspect the FJP behavior, as well as produce
the high-quality performance bug reports with the data backed up by
fjptrace data.

Thanks,
-Aleksey