On Saturday, 3 August 2019 at 16:35:34 UTC, Giovanni Di Maria
wrote:
For me the "goodness of random" is NOT important.
If that's the case, you could roll your own RNG:
//DMD64 D Compiler 2.072.2
import std.stdio;
import std.datetime;
import std.array, std.random;
void main(){
ubyte x;
auto r = benchmark!(f1,f2)(10_000);
writeln(r[0]);
writeln(r[1]);
}
int f1(){
static s = 10; // Seed
s = (214013*s+2531011); // [1]
s = (s>>16)&0x7FFF;
auto y=(s&7)+1;
//writeln(y);
return y;
}
int f2(){
byte c;
c=uniform!ubyte() % 8 +1;
//writeln(c);
return c;
}
/*
[1]
https://software.intel.com/en-us/articles/fast-random-number-generator-on-the-intel-pentiumr-4-processor/
*/
/*
OUTPUT:
TickDuration(65263) <-f1
TickDuration(635167) <-f2
*/
Matheus.
