@AuxCounters-like solution for events with stack traces?

[Chris]

More or less the latter, I think;
it's com.google.monitoring.runtime.instrumentation.AllocationRecorder from
the Maven artifact
com.google.code.java-allocation-instrumenter:java-allocation-instrumenter:3.0.1.

On Fri, Sep 8, 2017 at 3:09 PM Dmitry Chuyko <dmitry.chuyko at bell-sw.com>
wrote:

> Hi Chris,
>
> What you describe sounds more like a custom JMH profiler, not a counter.
> You are able to create and use one looking to existing built-in profilers
> like StackProfiler. Or you can dump and study JFR recordings for your JMH
> runs if you use Oracle JDK.
>
> Just curious, is AllocationRecorder you use an instrumenting Java agent or
> maybe exactly the one from google/allocation-instrumenter?
>
> -Dmitry
>
> > 8 сент. 2017 г., в 22:22, Chris <seahen123 at gmail.com> написал(а):
> >
> > Hi all,
> >
> > I have a benchmark where way too many objects are being created, but I
> have
> > no idea where or what class. Would it be possible, using @AuxCounters or
> > something similar, to emit something like a HashMultiset<StackTrace> or
> > Map<StackTrace, Integer> for reporting? StackTrace is a simple wrapper
> I've
> > built around StackTraceElement[] that does a truncation in the
> constructor
> > and implements equals, hashCode and toString.
> >
> > Failing that, is it possible that JMH is swallowing the output of these
> > methods? Because either that, or
> > com.google.monitoring.runtime.instrumentation.AllocationRecorder isn't
> > working. If the output *is* being swallowed, how do I re-enable it?
> >
> > // FIXME: Why isn't this outputting anything?
> > @Setup(Level.Trial)
> > public void setUp() {
> >  AllocationRecorder.addSampler((arrayLength, desc, newObj, size) -> {
> >    if (!desc.contains("StackTrace")) {
> >      LOG.info("Created %s (a %s of %d bytes)\n", newObj, desc, size);
> >      stackTraces.add(new
> > StackTrace(Thread.currentThread().getStackTrace()));
> >    }
> >  });
> > }
> >
> > // FIXME: Why isn't this outputting anything either?
> > @TearDown(Level.Trial)
> > public void tearDown() {
> >  System.gc();
> >  for (StackTrace stackTrace : stackTraces) {
> >    LOG.info("%d objects created from:\n%s\n",
> > stackTraces.count(stackTrace), stackTrace);
> >  }
> >  stackTraces.clear();
> > }
>
>