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Some will even put C++ at a disadvantage.
Out of curiosity any such examples ?
I was curious how a non-functional version would fare, so I wrote one in Nimrod and it's a lot faster than the functional C++: https://gist.github.com/def-/8187448ea7a5c8da8265 Goats Wolves Lions C++11 Nimrod 17 55 6 0.00 0.00 117 155 106 0.17 0.01 217 255 206 0.75 0.01 317 355 306 2.16 0.01 417 455 406 5.28 0.01 517 555 506 10.75 0.01 617 655 606 19.15 0.02 717 755 706 31.58 0.02 817 855 806 46.52 0.02 917 955 906 6…
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Also profile-guided optimization is ever more widespread with C/C++ compilers, which certainly wins some of the gains you'd normally only expect from the JITing VM.
C++ PGO can do less than JVM JIT does. E.g. JVM JIT takes into account actual configuration options chosen by the user and actual, not predicted workload. This can help e.g. with inlining, because JIT can see only one particular implementation of something was loaded by the user, and optimize for just that case. C++ PGO profiles for a single workload and config chosen by the program creator, which may or may not matc…
Also, the JVM JIT needs a steady-state workload to make good guesses about it's optimizations - if it JITs a bunch of methods and then the load changes such that the optimizations no longer apply (loops iterate differently, inlined methods don't get called as much), the JVM's runtime optimization can be foiled. JITting a very heterogenous program can trick the JVM into finding a local-minimum in native performance (which I guess is still a lot better than actually interpreting java byte code).
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Out of curiosity any such examples ?
Of course there are, and it only takes a few seconds with Google to find them. Here's one: the frannkuch-redux benchmark at http://benchmarksgame.alioth.debian.org/u64q/java.php gives Java a >20% CPU efficiency advantage over C++.
See http://benchmarksgame.alioth.debian.org/u64q/performance.php...
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I have never seen Sun or Oracle make that claim. You seem to simply be ranting on about a strawman argument, with a rather strange java-hate obsession. I mean, Fortran did worse than Java. Where is your writeup for that?
Cliff Click, a smart man in whom I see many admirable qualities, than whom there are few more complete experts on the JVM, gave a tech talk at Facebook about how Java is faster than C++ just a few months ago. Tons of perfectly smart engineers sat and took it seriously. Much of the content was a rehash of this older discussion: http://www.azulsystems.com/blog/cliff/2009-09-06-java-vs-c-p... There are plenty of serious…