Shared Kokkos lifecycle: lazy init + device barrier. More...

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namespace	pops

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void	pops::device_fence ()
	Device barrier: waits for in-flight kernels to finish before a HOST access to unified memory.

Detailed Description

Shared Kokkos lifecycle: lazy init + device barrier.

Required since the unified allocator (kokkos_malloc<SharedSpace>) is called AS SOON AS a Fab is built, BEFORE any for_each. Init can therefore no longer be left to the first kernel alone: this same guard applies to allocation AND to kernels, so that the Kokkos build (Serial/OpenMP/Cuda) works without an explicit Kokkos::initialize in each main.

SEQUENCING INVARIANT: detail::ensure_kokkos_initialized() is called by ManagedArena before any kokkos_malloc; device_fence() is called by the host before any access to unified memory after a kernel. These two entry points are the ONLY places where the Kokkos lifecycle is driven; do not call Kokkos::initialize/finalize anywhere else.

include/pops/core/foundation/kokkos_env.hpp File Reference¶

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Detailed Description