The evidence is very disputable. For example, I don't know who was writing
your paper, but they were NOT expert C++ programmers.
As an example:
> for (MaoCFG::NodeMap::iterator bb_iter = CFG_->GetBasicBlocks()->begin();
> bb_iter != CFG_->GetBasicBlocks()->end(); ++bb_iter) {
> number[(*bb_iter).second] = kUnvisited;
> }
>
>
This block is bad. The compiler will not be able to optimize it and will do
an expensive indirect lookup on each iteration. It needs to be rewritten as:
for (MaoCFG::NodeMap::iterator bb_iter = CFG_->GetBasicBlocks()->begin(),
bbend = CFG_->GetBasicBlocks()->end();
bb_iter != bb_end; ++bb_iter) {
number[(*bb_iter).second] = kUnvisited;
}
The same kind of rookie mistakes (made by fresh-from college developers?)
is all over the place. Honestly, I think that they pessimized the C++ code
until they reached the desired outcome.
If you want a somewhat more realistic range of benchmarks, look at Debian's
Benchmark game:
https://benchmarksgame-team.pages.debian.net/benchmarksgame/fastest/java.html
On Wednesday, February 12, 2020 at 9:59:43 PM UTC-8, robert engels wrote:
>
> Here is some pretty indisputable evidence on the advancements of GC/JVM vs
> C++.
>
> See this paper/project https://github.com/hundt98847/multi-language-bench
> that
> was done by Google in 2011. If you read the paper, the C++ code was tuned
> by expert C++ programmers at Google. The java_pro author version refused to
> optimize further - which he felt would create “esoteric non-idomatic” Java.
>
> The paper reports that the C++ code outperformed java_pro by 4x - 12x, and
> go_pro by 5.5x
>
> I re-ran the tests using the latest C++ compiler,Go, and Java 13. The
> code is unchanged since it was posted. Nothing has been modified (Go needed
> the directory structure changed to compile). Different hardware. Different
> OS. Different compilers. Different Java runtime. (same JVM settings - so
> using a different default GC). All tests run on the same OS/hardware.
>
> C++ (-O2) = 16.5 secs
> C++ (-O3) = 16.5 secs
> go_pro = 19 secs
> java_pro = 8.4 secs
>
> Or Java is almost 2x faster than C++, and Go is nearly the same
> performance as C++.
>
> Run the tests yourself… (easy to do, Makefiles included)
>
> JVM/GC has improved DRAMATICALLY in the past 9 years - static
> compilation/optimization not so much… Stressing again - ZERO CODE CHANGES !
>
> Enjoy !
>
>
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