On Friday, 15 August 2014 at 08:35:41 UTC, Philippe Sigaud via
Digitalmars-d-learn wrote:
I wonder if using plain `Array` instead may be result in
better performance
where immutability is not needed.
Hmm, no:
...
It is very different with better compiler though :
$ ldmd2 -release -O a.d
$ ./appendertest
Appender.put :378 ms, 794 μs, and 9 hnsecs
Appender ~= :378 ms, 416 μs, and 3 hnsecs
Std array :2 secs, 222 ms, 256 μs, and 2 hnsecs
Std array.reserve :2 secs, 199 ms, 64 μs, and 5 hnsecs
Array :349 ms and 250 μs
Array.reserve :347 ms, 694 μs, and 1 hnsec
new T[]() :37 ms, 989 μs, and 8 hnsecs
uninitializedArray :39 ms, 333 μs, and 3 hnsecs
(size 10_000)
I am still somewhat disappointed though because I'd expect static
Array to get close in performance to pre-allocated array of exact
size over many iterations - which doesn't happen. Need to
investigate.
