Ginkgo Generated from develop branch based on develop. Ginkgo version 1.10.0
A numerical linear algebra library targeting many-core architectures
 
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neighborhood_communicator.hpp
1// SPDX-FileCopyrightText: 2017 - 2025 The Ginkgo authors
2//
3// SPDX-License-Identifier: BSD-3-Clause
4
5#ifndef GKO_PUBLIC_CORE_DISTRIBUTED_NEIGHBORHOOD_COMMUNICATOR_HPP_
6#define GKO_PUBLIC_CORE_DISTRIBUTED_NEIGHBORHOOD_COMMUNICATOR_HPP_
7
8
9#include <ginkgo/config.hpp>
10
11
12#if GINKGO_BUILD_MPI
13
14
15#include <ginkgo/core/base/mpi.hpp>
16#include <ginkgo/core/distributed/collective_communicator.hpp>
17#include <ginkgo/core/distributed/index_map.hpp>
18
19
20namespace gko {
21namespace experimental {
22namespace mpi {
23
24
33class NeighborhoodCommunicator final : public CollectiveCommunicator {
34public:
36
37 NeighborhoodCommunicator(const NeighborhoodCommunicator& other) = default;
38
39 NeighborhoodCommunicator(NeighborhoodCommunicator&& other);
40
41 NeighborhoodCommunicator& operator=(const NeighborhoodCommunicator& other) =
42 default;
43
44 NeighborhoodCommunicator& operator=(NeighborhoodCommunicator&& other);
45
52
66 template <typename LocalIndexType, typename GlobalIndexType>
68 communicator base,
70
71 std::unique_ptr<CollectiveCommunicator> create_with_same_type(
72 communicator base,
73 const distributed::index_map_variant& imap) const override;
74
81 [[nodiscard]] std::unique_ptr<CollectiveCommunicator> create_inverse()
82 const override;
83
84 [[nodiscard]] comm_index_type get_recv_size() const override;
85
86 [[nodiscard]] comm_index_type get_send_size() const override;
87
97 friend bool operator==(const NeighborhoodCommunicator& a,
98 const NeighborhoodCommunicator& b);
99
105 friend bool operator!=(const NeighborhoodCommunicator& a,
106 const NeighborhoodCommunicator& b);
107
108protected:
115 request i_all_to_all_v_impl(std::shared_ptr<const Executor> exec,
116 const void* send_buffer, MPI_Datatype send_type,
117 void* recv_buffer,
118 MPI_Datatype recv_type) const override;
119
120private:
121 communicator comm_;
122
123 std::vector<comm_index_type> send_sizes_;
124 std::vector<comm_index_type> send_offsets_;
125 std::vector<comm_index_type> recv_sizes_;
126 std::vector<comm_index_type> recv_offsets_;
127};
128
129
130} // namespace mpi
131} // namespace experimental
132} // namespace gko
133
134
135#endif
136#endif // GKO_PUBLIC_CORE_DISTRIBUTED_NEIGHBORHOOD_COMMUNICATOR_HPP_
This class defines mappings between global and local indices.
Definition index_map.hpp:68
request i_all_to_all_v(std::shared_ptr< const Executor > exec, const SendType *send_buffer, RecvType *recv_buffer) const
Non-blocking all-to-all communication.
Definition collective_communicator.hpp:118
std::unique_ptr< CollectiveCommunicator > create_inverse() const override
Creates the inverse NeighborhoodCommunicator by switching sources and destinations.
friend bool operator!=(const NeighborhoodCommunicator &a, const NeighborhoodCommunicator &b)
Compares two communicators for inequality.
friend bool operator==(const NeighborhoodCommunicator &a, const NeighborhoodCommunicator &b)
Compares two communicators for equality locally.
comm_index_type get_recv_size() const override
Get the total number of received elements this communication patterns expects.
std::unique_ptr< CollectiveCommunicator > create_with_same_type(communicator base, const distributed::index_map_variant &imap) const override
Creates a new CollectiveCommunicator with the same dynamic type.
NeighborhoodCommunicator(communicator base)
Default constructor with empty communication pattern.
comm_index_type get_send_size() const override
Get the total number of sent elements this communication patterns expects.
NeighborhoodCommunicator(communicator base, const distributed::index_map< LocalIndexType, GlobalIndexType > &imap)
Create a NeighborhoodCommunicator from an index map.
A thin wrapper of MPI_Comm that supports most MPI calls.
Definition mpi.hpp:416
The request class is a light, move-only wrapper around the MPI_Request handle.
Definition mpi.hpp:327
The mpi namespace, contains wrapper for many MPI functions.
Definition mpi.hpp:36
int comm_index_type
Index type for enumerating processes in a distributed application.
Definition types.hpp:967
The Ginkgo namespace.
Definition abstract_factory.hpp:20