Possibly not. Those benchmarks (mandelbrot and n-body, pi-digits) are very low memory footprint benchmarks. So it might be a difference of going from 20K to 30meg constant memory usage.
Whereas the other benchmarks seem to have single digit multiples of memory usage. SO seemingly real world apps will use more memory, but not 100x in practice.
Also note that for Fixnum dependent benchmarks, JRuby has to allocate memory due to boxed integers, whereas on the de facto interpreter it's able to use tagged pointers which allow Fixnums to be treated as simple numeric values.
This may be going away in JDK9 as they claim they're eliminating primitive types in favor of an everything-is-an-object model.
Comments
Possibly not. Those benchmarks (mandelbrot and n-body, pi-digits) are very low memory footprint benchmarks. So it might be a difference of going from 20K to 30meg constant memory usage.
Whereas the other benchmarks seem to have single digit multiples of memory usage. SO seemingly real world apps will use more memory, but not 100x in practice.
Also note that for Fixnum dependent benchmarks, JRuby has to allocate memory due to boxed integers, whereas on the de facto interpreter it's able to use tagged pointers which allow Fixnums to be treated as simple numeric values.
This may be going away in JDK9 as they claim they're eliminating primitive types in favor of an everything-is-an-object model.