Andrei's Google Talk

[Andrei Alexandrescu]

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