Java Perf Events

Java wrapper for Linux perf tool/api

Usage

Single event

    PerfEvent cycles = new PerfEvent("cycles");
    cycles.start();
    try {
        // some code we want to measure
        System.out.printf("%s: %,d\n", cycles.getEventName, cycles.read());
    } finally {
        cycles.shutdown();
    }

Multiple events

    PerfEvent events = new PerfGroupEvent("cycles,instructions,cache-misses");
    events.start();
    try {
        // some code we want to measure
        events.read((name, value) -> System.out.printf("%s: %,d\n", name, value));
    } finally {
        events.shutdown();
    }

Events

Java Perf Events supports Generic event (Hardware, Hardware Cache & Software), architecture specific PMU events and Linux tracepoints

Perf Java Wrapper

Java Perf Events provides JPerf class as a perf wrapper that reimplements roughly perf list & perf stat commands. This is use as a sample of API usage