Speed of Random Numbers

[Giovanni Di Maria]

On Saturday, 3 August 2019 at 17:44:44 UTC, lithium iodate wrote:
> On Saturday, 3 August 2019 at 16:35:34 UTC, Giovanni Di Maria 
> wrote:
>> [...]
>
> First off you could try to use a faster RNG engine than the 
> default. The easiest way is to define a variable containing it 
> and passing it to the functions each time.
>
> auto rng = Xorshift(1234);
> randomNumber = uniform!uint(rng);
>
> This basic change approximately halved the 5 seconds your 
> original example needs on my computer.
> Another simple approach that I have tried is simply hashing the 
> iterator using a fast hash function.
> With xxHash32 I got the time down to 0.25 seconds. I also tried 
> xxHash64 and FNV1a but they were not faster in my quick test.



Thank you very much Lithium Iodate
Now i will try it.
I let know you.
Thank you
Giovanni