alt Hacker NewsWhy are you surprised? Java always suffers from abstraction penalty for running on a VM. You should be surprised (and skeptical) if Java ever beats C++ on any benchmark.
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pron • today at 3:43 AM
The only "abstraction penalty" of "running on a VM" (by which I think you mean using a JIT compiler), is the warmup time of waiting for the JIT.
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For the most naive code, if you're calling "new" multiple times per row, maybe Java benefits from out of band GC while C++ calls destructors and free() inline as things go out of scope?
Of course, if you're optimizing, you'll reuse buffers and objects in either language.