dmd -run speed trends

[Witold Baryluk]

On Thursday, 7 December 2023 at 21:48:29 UTC, Siarhei Siamashka 
wrote:
> On Thursday, 7 December 2023 at 20:39:03 UTC, Witold Baryluk 
> wrote:
>> Also for completeness, golang:
>> [...]
>
> For completeness, could you please also try Ruby interpreter 
> and Crystal compiler? The same source file is valid for both.


Thanks for the interest.

Nice.

Results from same system the initial numbers were gathered on:


|x|min time [ms]|Notes|
|---|---:|---|
|ruby 3.1.2p20                  |   69.5 |
|crystal 1.9.2 (LLVM 14.0.6)    | 1471.0 |
| D (ldc2 1.35.0 (DMD v2.105.2, LLVM 16.0.6))              |  
821.0 |

Ruby has slightly longer startup than Python, but not too bad.  I 
expect other purely interpreted languages like Perl, PHP, to have 
similar times.

I included ldc2 compiler, to make it easier to compare to crystal.

ldc2 looks similar to dmd. Faster than gdc (this is mostly to be 
expected tho), but otherwise similar.

In crystal, it looks like final codegen and linking are 
responsible for about 2/3 of the time spent.  Maybe switching to 
something like gold or mold linker could be help a little. This 
should help with dmd too a little.

I also tried to use D `-release` switch, hoping there will be 
less to codegen. There is a difference (about 1.5%), but nothing 
spectacular.