bearophile wrote:
Yes, for such tiny benchmarks I have seen several times 10-12 higher allocation
performance in Java compared to D1-DMD. But real programs don't use all their
time allocating and freeing memory...
Bye,
bearophile
For the compiler I'm working on now (in D), I wanted to check the
affects of allocation on performance. Using a placement new, the time
for lex/parse/semantic/type-infer/codegen (on a really huge in-memory
file) went from ~6 seconds to ~4 seconds (don't have the exact timings,
and can't repro right now since I'm redoing inference). So I'd say that
even in real-world applications, these things have an effect.
Of course, this only applies to programs which allocate and throw away a
lot of small objects. This is a style encouraged by Java and C#'s
programming models, much less so by, say, C++'s.
