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| Original file line number | Diff line number | Diff line change |
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| # examples/03-reduce.jl | ||
| # This example shows how to use custom datatypes and reduction operators | ||
| # It computes the variance in parallel in a numerically stable way | ||
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| using MPI, Statistics | ||
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| MPI.Init() | ||
| const comm = MPI.COMM_WORLD | ||
| const root = 0 | ||
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| rank = MPI.Comm_rank(comm) | ||
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| X = fill(rank, 7) | ||
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| # Perform a sum reduction | ||
| X = MPI.Allreduce(X, MPI.SUM, comm) | ||
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| if MPI.Comm_rank(comm) == root | ||
| println("The sum of the arrays is: ", X) | ||
| end |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,70 @@ | ||
| # examples/03-reduce.jl | ||
| # This example shows how to use custom datatypes and reduction operators | ||
| # It computes the variance in parallel in a numerically stable way | ||
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| using MPI, Statistics | ||
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| RBuffer = MPI.RBuffer | ||
| Op = MPI.Op | ||
| API = MPI.API | ||
| MPI_Op = MPI.MPI_Op | ||
| IN_PLACE = MPI.IN_PLACE | ||
| Comm = MPI.Comm | ||
| AbstractRequest = MPI.AbstractRequest | ||
| Request = MPI.Request | ||
| _doc_external = x -> "For more information, see the [MPI documentation]($x)." | ||
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| ## Iallreduce | ||
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| # mutating | ||
| """ | ||
| Iallreduce!(sendbuf, recvbuf, op, comm::Comm, req::AbstractRequest=Request()) | ||
| Iallreduce!(sendrecvbuf, op, comm::Comm, req::AbstractRequest=Request()) | ||
| Performs elementwise reduction using the operator `op` on the buffer `sendbuf`, storing | ||
| the result in the `recvbuf` of all processes in the group. | ||
| If only one `sendrecvbuf` buffer is provided, then the operation is performed in-place. | ||
| # See also | ||
| - [`Iallreduce`](@ref), to handle allocation of the output buffer. | ||
| - [`Op`](@ref) for details on reduction operators. | ||
| # External links | ||
| $(_doc_external("MPI_Iallreduce")) | ||
| """ | ||
| function Iallreduce!(rbuf::RBuffer, op::Union{Op,MPI_Op}, comm::Comm, req::AbstractRequest=Request()) | ||
| # int MPI_Iallreduce(const void *sendbuf, void *recvbuf, int count, | ||
| # MPI_Datatype datatype, MPI_Op op, MPI_Comm comm, | ||
| # MPI_Request *request) | ||
| API.MPI_Iallreduce(rbuf.senddata, rbuf.recvdata, rbuf.count, rbuf.datatype, op, comm, req) | ||
| return req | ||
| end | ||
| Iallreduce!(rbuf::RBuffer, op, comm::Comm, req::AbstractRequest=Request()) = | ||
| Iallreduce!(rbuf, Op(op, eltype(rbuf)), comm, req) | ||
| Iallreduce!(sendbuf, recvbuf, op, comm::Comm, req::AbstractRequest=Request()) = | ||
| Iallreduce!(RBuffer(sendbuf, recvbuf), op, comm, req) | ||
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| # inplace | ||
| Iallreduce!(buf, op, comm::Comm, req::AbstractRequest=Request()) = Iallreduce!(IN_PLACE, buf, op, comm, req) | ||
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| MPI.Init() | ||
| const comm = MPI.COMM_WORLD | ||
| const root = 0 | ||
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| rank = MPI.Comm_rank(comm) | ||
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| X = fill(rank, 7) | ||
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| # Perform a sum reduction | ||
| req = Iallreduce!(X, MPI.SUM, comm) | ||
| sleep(rand()) | ||
| MPI.Wait(req) | ||
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| if MPI.Comm_rank(comm) == root | ||
| println("Rank $(MPI.Comm_rank(comm)): The array is: ", X) | ||
| println("Rank $(MPI.Comm_rank(comm)): Should have gotten: ", sum(0:MPI.Comm_size(comm)-1)) | ||
| end | ||
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| MPI.Finalize() |
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@JuliaRegistrator register
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Registration pull request created: JuliaRegistries/General/119634
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