I know that to use Xoshiro256++ is better to randomize the seed with a fast rng as splitmix. This enables us to generate the 4 states of xoshiro256++. Is this done by default?

Yes: JuliaLang/julia/blob/02699bb6cd83d16b1e51e2fb127241e18df7c56b/src/task.c#L854 s3 = (s3 << 45) | (s3 >> 19); rngState[0] = s0; rngState[1] = s1; rngState[2] = s2; rngState[3] = s3; …

If you’re asking about the initial seeding rather than the task splitting, then we do way better and use SHA256 to go from user-provided seeds to create the actual RNG state.

Have you thought about putting that comment on arxiv?

Yeah, I’ve thought about writing it up. But making something into a paper is always so much extra work…

JuliaLang/julia/blob/02699bb6cd83d16b1e51e2fb127241e18df7c56b/src/task.c#L903-L910 we instead limit pedigree coordinates to being binary, guaranteeing invertibility regardless of modulus. When a task spawns a child, the parent and child share the …

It does, right?! But task forks are inherently binary—each task only forks one child at a time—so it really felt like there had to be some way to make the task coordinates binary. The tricky bit is that you have a choice of somewhat unintuitive ways of thinking about binary “pedigree” coordinates: …

Random seed initialization with splitmix

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Random seed initialization with splitmix

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