shamalgs::collective::InvariantParallelGenerator< Engine > Class Template Reference

A parallel generator that will spit the same sequence regardless of the number of ranks. More...

#include <shamalgs/include/shamalgs/collective/InvariantParallelGenerator.hpp>

Public Member Functions
	InvariantParallelGenerator (Engine eng, u64 nval_max=u64_max)
	InvariantParallelGenerator (u64 seed, u64 nval_max=u64_max)
std::vector< u64 >	next_n (u64 val_count, bool sequential=false)
	Generate the next val_count values.
bool	is_done ()
	quite explicit isn't it ?
bool	all_ranks_are_in_sync ()
	check if all ranks have the same generator state

Detailed Description

template<class Engine = std::mt19937_64>
class shamalgs::collective::InvariantParallelGenerator< Engine >

A parallel generator that will spit the same sequence regardless of the number of ranks.

Definition at line 28 of file InvariantParallelGenerator.hpp.

Constructor & Destructor Documentation

InvariantParallelGenerator() [1/2]

template<class Engine = std::mt19937_64>

shamalgs::collective::InvariantParallelGenerator< Engine >::InvariantParallelGenerator ( Engine eng, u64 nval_max = u64_max )

inline

Definition at line 94 of file InvariantParallelGenerator.hpp.

InvariantParallelGenerator() [2/2]

template<class Engine = std::mt19937_64>

shamalgs::collective::InvariantParallelGenerator< Engine >::InvariantParallelGenerator ( u64 seed, u64 nval_max = u64_max )

inline

Definition at line 101 of file InvariantParallelGenerator.hpp.

Member Function Documentation

all_ranks_are_in_sync()

template<class Engine = std::mt19937_64>

bool shamalgs::collective::InvariantParallelGenerator< Engine >::all_ranks_are_in_sync ( )

inline

check if all ranks have the same generator state

Definition at line 132 of file InvariantParallelGenerator.hpp.

is_done()

template<class Engine = std::mt19937_64>

bool shamalgs::collective::InvariantParallelGenerator< Engine >::is_done ( )

inline

quite explicit isn't it ?

Definition at line 129 of file InvariantParallelGenerator.hpp.

next_n()

template<class Engine = std::mt19937_64>

std::vector< u64 > shamalgs::collective::InvariantParallelGenerator< Engine >::next_n ( u64 val_count, bool sequential = false )

inline

Generate the next val_count values.

Parameters

val_count	the number of values to generate
sequential	if true, the values are generated sequentially on all ranks, otherwise in parallel on all ranks

Returns

std::vector<u64> the generated values (max size is val_count) actual size depends on the number of remaining values

If sequential is true, the values are generated sequentially on all ranks. If sequential is false, the values are generated in parallel on all ranks.

Note

allgatherv(next_n(n, false)) == next_n(n,true)

The values are generated in a way that is invariant to the number of ranks.

Definition at line 119 of file InvariantParallelGenerator.hpp.

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The documentation for this class was generated from the following file:

• shamalgs/include/shamalgs/collective/InvariantParallelGenerator.hpp