Predictability Summary:

non-threads

# Processes

- CORE
CORE::srand(N);
CORE::rand();

- PDL
CORE::srand(N);  # This also, for MCE predictable results
PDL::srand(N);   # PDL v1.062 ~ v1.089
PDL::srandom(N); # PDL v1.089_01
PDL->random;     # MCE v1.895

- Math::Prime::Util
CORE::srand(N);  # This also, for MCE predictable results
Math::Prime::Util::srand(N);
Math::Prime::Util::drand();
Math::Prime::Util::irand64();

- Math::Random
CORE::srand(N);  # This also, for MCE predictable results
Math::Random::random_set_seed(N, N);
Math::Random::random_normal();
Math::Random::random_uniform();

- Math::Random::MT::Auto
CORE::srand(N);  # This also, for MCE predictable results
Math::Random::MT::Auto::set_seed(N);
Math::Random::MT::Auto::rand();
[download]

threads

# Threads (matching non-threads output), requires MCE v1.894

- CORE
CORE::srand(N);
CORE::rand();

- Math::Prime::Util
CORE::srand(N);  # This also, for MCE predictable results
Math::Prime::Util::srand(N);
Math::Prime::Util::drand();
Math::Prime::Util::irand64();

- Math::Random::MT::Auto
CORE::srand(N);  # This also, for MCE predictable results
Math::Random::MT::Auto::set_seed(N);
Math::Random::MT::Auto::rand();

- Not possible
PDL or Math::Random
[download]

Running threads, I'm unable to generate predictable results using PDL or Math::Random (random_normal/random_uniform), regardless seeding the generator per each thread.

See the complete demonstration here. Run Perl with -Mthreads to spin threads.

---

In reply to Re^12: PDL and srand puzzle - predictability summary by marioroy
in thread PDL and srand puzzle by syphilis

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