Cluster Class

[ryanmrichard]

The Cluster class generalizes the concept of an MPI group.

class Cluster { public: // Returns some identifying name of the cluster std::string name(); // The number of nodes (MPI ranks) in the cluster size_type size(); // Is the current node in the cluster? bool has_me(); // Get the current node Node me(); /// Get the number of network storage places this cluster has (these are things like network filesystems /// not node-local storage places) size_type n_storage(); /// Gets the i-th memory space Storage memory_space(size_type i); // Returns node i Node operator[](size_type i); // Collectives originating from all members going to one point template<template <typename> typename Container, typename OperationType> auto reduce(Container&& data, OperationType&& op, Node destination); template<template <typename> typename Container> auto gather(Container&& data, Node destination); // Collectives originating from all members going to all members template<template <typename> typename Container, typename OperationType> auto reduce(Container&& data, OperationType&& op, Cluster destination); template<template <typename> typename Container> auto gather(Container&& data, Cluster destination); // Standard output stream (lets all nodes in this cluster print) std::ostream stdout; // Standard error stream std::ostream stderr; };

Notes:

• The actual implementation should probably create Node instances on the fly, rather than storing them.
• Stream classes will need to properly account for MPI rank