Question about Komirand seeds

[scottchiefbaker]

In your Komirand examples in the README you set both seeds to the same number in all the examples:

komirand Seed1/Seed2 = 0x0000000000000000:
komirand Seed1/Seed2 = 0x0123456789abcdef:
komirand Seed1/Seed2 = 0x0000000000000100:

and in the code you mention: "Seed2, a supporting variable. Best initialized to the same value as Seed1". I'm curious why you recommend setting both seeds to the same number (effectively one seed). From my testing it appears that having two different seeds shortens the amount of warmup needed?

I've had pretty good luck using komihash as a source for seeds:

int main(int argc, char *argv[]) {
    const char *buf = "Some string";
    uint64_t seed1  = komihash(buf, sizeof(buf), 0);
    uint64_t seed2  = komihash(buf, sizeof(buf), seed1);

    for (int i = 0; i < 5; i++) {
        uint64_t rand64 = komirand(&seed1, &seed2);
        printf("Komirand: %llu\n", rand64);
    }
}

Is there something intrinsic to komirand that makes using the same value for both seeds preferable?

[avaneev]

This isn't a necessity, just easier to initialize, yes warm-up should be shorter as independent seed1,2 values are already uniformly random. Warm-up is needed to "randomize" the state appropriately.