boxing + unboxing a VT is not a no-op ?
tobias.hartmann at oracle.com
Tue Jul 17 14:58:41 UTC 2018
okay, thanks for the details. Could you maybe upload the jmh benchmark .jar? I have problems to
build the entire benchmark suite from scratch and I cannot reproduce the performance difference when
extracting the benchmark methods and running them manually.
On 17.07.2018 16:14, forax at univ-mlv.fr wrote:
> when i run the benchmark,
> Benchmark Mode Cnt Score Error Units
> ReifiedListBenchMark.arraylist_integer_get avgt 9 0.055 ± 0.001 ms/op
> ReifiedListBenchMark.reifiedlist_intbox_get avgt 9 506.190 ± 7.978 ms/op
> ReifiedListBenchMark.valuelist_intbox_get avgt 9 0.027 ± 0.001 ms/op
> ReifiedListBenchMark.valuelist_intbox_inlined_reduce avgt 9 0.027 ± 0.001 ms/op
> ReifiedListBenchMark.valuelist_intbox_innervalue_inlined_reduce avgt 9 0.304 ± 0.004 ms/op
> if you compare valuelist_intbox_get and valuelist_intbox_inlined_reduce you see that a value type that contains an int as as fast as an int, that's great but i'm more interested by the last two benchmarks.
> valuelist_intbox_innervalue_inlined_reduce should be as fast as valuelist_intbox_inlined_reduce, because the only difference is value type to object boxing.
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