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new port: java/lightweight-java-profiler

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A port of the lightweight-java-profiler (ljp). ljp acts as a bare-bones agentlib to produce profiling stacks that can be digested, e.g., by Brendan Gregg's flamegraph scripts.

Reviewed by:	mat, swills (mentor)
Approved by:	swills (mentor)
Differential Revision:	https://reviews.freebsd.org/D10194
This commit is contained in:
Johannes M Dieterich
2017-04-01 17:58:59 +00:00
parent bc79e16f30
commit a77376a1fe
9 changed files with 158 additions and 0 deletions
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java/lightweight-java-profiler/pkg-message
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To use the lightweight-java-profiler, you can invoke Java as follows:
java -agentpath:path/to/liblagent.so[:file=fname] It will spit out stack traces into traces.txt (or into the optional fname passed to the agent). The current implementation samples every 1/100th of a second. It stores the first 3000 stack traces it encounters; additional stack traces will be ignored, but duplicate stack traces will continue to be counted indefinitely (or until the counter overflows, which will take a while).