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lib kokkos: Enable deterministic use of Random_XorShift*_Pool.

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Add support for lock-free and deterministic use of Random_XorShift*_Pool
by giving state_idx selection and lock responsibility up to the
application.  Done by an overload of get_state() to take sate_idx as
an argument that the appplication guarantees is concurrently unique
and within the range of num_states that the application passed to init().
In other words, this allows the RNG state to be associated with some
application specific index, rather than a runtime arbitrary thread ID,
and thus the application can control which work is performed using
which RNG in a deterministic manner, regardless of which thread
performs the work.
This commit is contained in:
Tim Mattox
2017-03-01 11:52:33 -05:00
parent 6e26358ec3
commit 641bf72f20
1 changed files with 12 additions and 0 deletions
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12
lib/kokkos/algorithms/src/Kokkos_Random.hpp
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@ -752,6 +752,12 @@ namespace Kokkos {
return Random_XorShift64<DeviceType>(state_(i),i); return Random_XorShift64<DeviceType>(state_(i),i);
} }
// NOTE: state_idx MUST be unique and less than num_states
KOKKOS_INLINE_FUNCTION
Random_XorShift64<DeviceType> get_state(const int state_idx) const {
return Random_XorShift64<DeviceType>(state_(state_idx),state_idx);
}
KOKKOS_INLINE_FUNCTION KOKKOS_INLINE_FUNCTION
void free_state(const Random_XorShift64<DeviceType>& state) const { void free_state(const Random_XorShift64<DeviceType>& state) const {
state_(state.state_idx_) = state.state_; state_(state.state_idx_) = state.state_;
@ -1006,6 +1012,12 @@ namespace Kokkos {
return Random_XorShift1024<DeviceType>(state_,p_(i),i); return Random_XorShift1024<DeviceType>(state_,p_(i),i);
}; };
// NOTE: state_idx MUST be unique and less than num_states
KOKKOS_INLINE_FUNCTION
Random_XorShift1024<DeviceType> get_state(const int state_idx) const {
return Random_XorShift1024<DeviceType>(state_,p_(state_idx),state_idx);
}
KOKKOS_INLINE_FUNCTION KOKKOS_INLINE_FUNCTION
void free_state(const Random_XorShift1024<DeviceType>& state) const { void free_state(const Random_XorShift1024<DeviceType>& state) const {
for(int i = 0; i<16; i++) for(int i = 0; i<16; i++)