Skip to main content

class collective_group

Declaration

class collective_group { /* full declaration omitted */ };

Description

Each collective host task is executed within a collective group. If multiple host tasks are scheduled within the same collective group, they are guaranteed to execute in the same order on every node and within a single thread per node. Each group has its own MPI communicator spanning all participating nodes, so MPI operations the user invokes from different collective groups do not race.

Declared at: include/handler.h:116

Member Variables

detail::collective_group_id m_cgid
static detail::collective_group_id s_next_cgid = detail::root_collective_group_id + 1

Member Function Overview

Member Functions

collective_group() noexcept

Description

Creates a new collective group with a globally unique id. This must only be called from the application thread.

Declared at: include/handler.h:119