Leandro Lucarella wrote:
Andrei Alexandrescu, el 3 de agosto a las 19:48 me escribiste:
Leandro Lucarella wrote:
Walter Bright, el 3 de agosto a las 15:08 me escribiste:
bearophile wrote:
At 14.42: You compare the performance of a D compiler with the performance of
a C++ compiler. But Delphi compiler was/is very fast (and probably the
FreePascal compile too), I have never "waited" for my Delphi (ObjectPascal)
code to compile. I think on average it takes only two thousand clock ticks to
compile one line of ObjectPascal code. It sounds a lot, but it means that
with a modern single-core CPU you can produce your binary file from a one
million ObjectPascal lines long program in less than two seconds.
ObjectPascal type system looks a bit simpler than D one (despite it has OOP,
generics, modules, inline asm, dynamic strings, records, all basic D types,
etc), so this isn't a fully apple-to-apple comparison.
Some context is in order. The talk was given at Google and aimed at
what would be interesting to Googlers. Google uses C++ extensively,
and Rob Pike (of Go) listed as a motivator for Go the compile speed
problems with C++. Rob made a point of how fast Go compiled code,
and Go's compile speed has been praised a lot on Reddit as well.
Andrei put together a benchmark that shows that D compiles 4 times faster than
Go.
I was surprised by that, can you publish what the benchmark was, and
what compilers were used? I tried Go when it came out and it felt faster
than D to compile (which is reasonable because is a much simpler
language).
I tested on two laptops (Ubuntu and Mac OSX). I compiled the two
languages' standard libraries by using the provided makefiles, after
touching all .go and all .d files involved. Then I divided the
compilation times by the line counts of *.go/*.d files as wc has
them and compared the results.
On OSX dmd was 4.3 times faster. On Ubuntu, the ratio was 4.45.
Seems like a very fair benchmark, I'm really surprised. Which Go
compiler did you tried, gccgo or gc (6g/8g)? IIRC gccgo is much slower
than gc.
6g.
Andrei
