[stefs]

in my opinion, this assertion suffers from the "sufficiently smart compiler" fallacy somewhat.

https://wiki.c2.com/?SufficientlySmartCompiler

[pron]

No, Java's existing compiler is very good, and it generates as good code as you'd want. There is definitely still a cost due to objects not being inlined in arrays yet (this will change soon) that impacts some programs, but in practice Java performs more-or-less the same as C++.

In this case, however, it appears that the Java program may have been configured in a suboptimal way. I don't know how much of an impact it has here, but it can be very big.

[galangalalgol]

Even benchmarks that allow for jit warmup consistently show java roughly half the speed of c/c++/rust. Is there something they are doing wrong? I've seen people write some really unusual java to eliminate all runtime allocations, but that was about latency, not throughput.

[sswatson]

The linked article makes a specific carveout for Java, on the grounds that its SufficientlySmartCompiler is real, not hypothetical.

[remexre]

c++ certainly also has and needs a similarly sufficiently smart compiler to be compiled at all…