Optimizations and performance

[default0 via Digitalmars-d]

On Thursday, 9 June 2016 at 06:51:53 UTC, poliklosio wrote:
> On Thursday, 9 June 2016 at 01:46:45 UTC, Dave wrote:
>> On Wednesday, 8 June 2016 at 22:32:49 UTC, Ola Fosheim Grøstad
>>> I wouldn't put too much emphasis on that benchmark as the 
>>> implementations appear different? Note that Felix compiles to 
>>> C++, yet beats C++ in the same test? Yes, Felix claims to do 
>>> some high level optimizations, but doesn't that just tell us 
>>> that the C++ code tested wasn't optimal?
>>
>> Languages should be fast by default. I always find it missing 
>> the point when people go crazy during these benchmarking tests 
>> trying to make the code as fast as possible by tweaking both 
>> the code and the compiler flags. Go through that effort with a 
>> 2 million line app. Tell me how long that takes.
>
> YES +1000

I agree with the sentiment, but you often do want to spend time 
finding hot paths in your app and optimizing those. In a 2 
million line app, there will not be 2 million lines of code in 
the hot path. So figuring out how many tricks you can do to get 
something going fast does have quite a bit of value, even for 
large apps.