gs_caf.F90 File Reference

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Data Types
type	gs_caf::gs_caf_t
	Gather-scatter communication using Coarray Fortran (F2008). Each image puts directly into the (module-level) receive coarray on the destination image. The signaling mode (NEKO_GS_CAF_SIGNALING) selects how segment ordering is established: sync uses sync images over the union of send and recv peers, atomic uses per-peer atomic_define/atomic_ref on data_ready/buf_ready counters, and event uses coarray events. More...

Modules
module	gs_caf
	Defines Coarray Fortran gather-scatter communication.

Functions/Subroutines
subroutine	gs_caf::gs_caf_init (this, send_pe, recv_pe)
	Initialise Coarray Fortran based communication method.
subroutine	gs_caf::gs_caf_free (this)
	Deallocate Coarray Fortran based communication method. The shared module-level recv coarray is intentionally retained so it can be reused by subsequent gs_caf_t instances.
subroutine	gs_caf::gs_nbsend_caf (this, u, n, tag, deps, strm)
	Pack u into per-peer slabs and put each slab into the remote image's recv_buf. Double buffering means each round writes to a different half of the recv coarray, so no back-pressure synchronisation is needed in sync mode – the visibility synchronisation in nbwait suffices. Atomic and event modes still use their per-pair signalling.
subroutine	gs_caf::gs_nbrecv_caf (this, tag)
	No-op for coarrays: senders push into the receiver's buffer, so the receive side does not need to post anything.
subroutine	gs_caf::gs_nbwait_caf (this, u, n, op, strm)
	Wait for all incoming puts and reduce them into u. In sync mode a sync_images bracket pairs with the senders' nbsend; in atomic mode each sender is awaited via its data_ready counter and credited via buf_ready after unpack.
subroutine	gs_caf::gs_nbsend_vec_caf (this, u, n, nc, tag, deps, strm)
	Fused nc-component put. Each peer slab is nc consecutive component blocks; the remote placement offset and slab length scale by nc, the per-peer signalling (sync/atomic/event) is unchanged.
subroutine	gs_caf::gs_nbrecv_vec_caf (this, tag, nc)
	No-op: senders push into the receiver's buffer.
subroutine	gs_caf::gs_nbwait_vec_caf (this, u, n, nc, op, strm)
	Fused nc-component wait/reduce for the coarray backend.

Variables
integer, parameter, public	gs_caf::gs_caf_signal_sync = 1
integer, parameter, public	gs_caf::gs_caf_signal_atomic = 2
integer, parameter, public	gs_caf::gs_caf_signal_event = 3