Peter Lawrey discusses Unsafe in Java 8, Project Panama in Java 17 and Java 19, including pactical uses with code examples, demo using Panama, Event Sourcing using shared memory with Chronicle Queue.

The Java Memory Map (JMAP) utility has a method that prints a histogram of the Java heap. One side effect of the jmap command is that when it's called, it forces a garbage collection routine.

And it's not without reason; inspecting a Ruby application's memory profile, much less diagnosing problems, has traditionally been very difficult. At least, difficult if you don't use JRuby.