Performance of non-static method handles

[John Rose]

Vladimir Ivanov did some work a few years ago on MH customization for hot MH instances. It’s in the system. That should get better results than what you show. I wonder why it isn’t kicking in. You are using invokeExact right?

> On Feb 2, 2018, at 1:26 PM, Charles Oliver Nutter <headius at headius.com> wrote:
> 
> Hey folks!
> 
> I'm running some simple benchmarks for my FOSDEM handles talk and wanted to reopen discussion about the performance of non-static-final method handles.
> 
> In my test, I just try to call a method that adds given argument to a static long. The numbers for reflection and static final handle are what I'd expect, with the latter basically being equivalent to a direct call:
> 
> Direct: 0.05ns/call
> Reflected: 3ns/call
> static final Handle: 0.05ns/call
> 
> If the handle is coming from an instance field or local variable, however, performance is only slightly faster than reflection. I assume the only real improvement in this case is that it doesn't box the long value I pass in.
> 
> local var Handle: 2.7ns/call
> 
> What can we do to improve the performance of non-static method handle invocation?
> 
> - Charlie
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