Pure Interpreter Speed

[Stefan Marr]

Hi:

I was measuring the pure interpreter speed of TruffleSOM and would just like to hear whether the following is plausible.

I ran my benchmarks on top of a plain Hotspot as well as one with Graal.
For the one with Graal, I also passed in the following flag to ensure I see the interpreter speed only:
 -G:TruffleCompileOnly=__something_that_really_doesnt_exist__so_that_nothing_is_compiled__

As a result, I see the pure interpreter on top of Graal being somewhere between 20% and 80% slower than on plain Java.
Does that sound about right? I assume this overhead is the additional book keeping done to facilitate compilation?

Thanks
Stefan


-- 
Stefan Marr
INRIA Lille - Nord Europe
http://stefan-marr.de/research/