Template Class mrg31k3p_engine

Class Documentation

template<unsigned long long DefaultSeed = ROCRAND_MRG31K3P_DEFAULT_SEED>
class mrg31k3p_engine

Pseudorandom number engine based MRG31k3p CMRG.

mrg31k3p_engine is an implementation of MRG31k3p pseudorandom number generator, which is a Combined Multiple Recursive Generator (CMRG) created by Pierre L’Ecuyer. It produces random 32-bit unsigned int values on the interval [0; 2^32 - 1].

Public Types

typedef unsigned int result_type

Type of values generated by the random number engine.

typedef rocrand_ordering order_type

Pseudo-random number engine ordering type. Represents the ordering of the results of a random number engine.

See also: order()

typedef unsigned long long offset_type

Pseudo-random number engine offset type. Offset represents a number of the random number engine’s states that should be skipped before first value is generated.

See also: offset()

typedef unsigned long long seed_type

Pseudo-random number engine seed type definition.

See also: seed()

Public Functions

inline mrg31k3p_engine(seed_type seed_value = DefaultSeed, offset_type offset_value = 0, order_type order_value = ROCRAND_ORDERING_PSEUDO_DEFAULT)

Constructs the pseudo-random number engine.

See also: rocrand_create_generator()

Parameters:
  • seed_value – - seed value to use in the initialization of the internal state, see also seed()

  • offset_value – - number of internal states that should be skipped, see also offset()

  • order_value – - ordering of the sequences generated by the engine, see also order()

inline mrg31k3p_engine(rocrand_generator &generator)

Constructs the pseudo-random number engine.

The pseudo-random number engine will be created using generator. The constructed engine take ownership over generator, and sets passed reference to NULL. The lifetime of generator is now bound to the lifetime of the engine.

Parameters:

generator – - rocRAND generator

inline ~mrg31k3p_engine() noexcept(false)

Destructs the engine.

See also: rocrand_destroy_generator()

inline void stream(hipStream_t value)

Sets the random number engine’s hipStream for kernel launches.

Parameters:

value – - new hipStream to use

inline void order(order_type value)

Sets the order of a random number engine.

The order refers to the ordering of the sequences generated by the engine.

  • This operation resets the engine’s internal state.

  • This operation does not change the engine’s seed.

See also: rocrand_set_ordering()

Parameters:

value – - New ordering

inline void offset(offset_type value)

Sets the offset of a random number engine.

Offset represents a number of the random number engine’s states that should be skipped before first value is generated.

  • This operation resets the engine’s internal state.

  • This operation does not change the engine’s seed or the number of dimensions.

See also: rocrand_set_offset()

Parameters:

value – - New absolute offset

inline void seed(seed_type value)

Sets the seed of the pseudo-random number engine.

The seed is used to construct the initial state of an engine.

  • This operation resets the engine’s internal state.

  • This operation does not change the engine’s offset.

See also: rocrand_set_seed()

Parameters:

value – - New seed value

template<class Generator>
inline void operator()(result_type *output, size_t size)

Fills output with uniformly distributed random integer values.

Generates size random integer values uniformly distributed on the interval [0, 2^32 - 1], and stores them into the device memory referenced by output pointer.

The device memory pointed by output must have been previously allocated and be large enough to store at least size values of IntType type.

See also: rocrand_generate()

Parameters:
  • output – - Pointer to device memory to store results

  • size – - Number of values to generate

inline result_type min() const

Returns the smallest possible value that can be generated by the engine.

inline result_type max() const

Returns the largest possible value that can be generated by the engine.

Public Static Functions

static inline constexpr rocrand_rng_type type()

Returns type of the rocRAND pseudo-random number generator associated with the engine.

Public Static Attributes

static constexpr seed_type default_seed = DefaultSeed

The default seed equal to DefaultSeed.