[Mpi3-rma] MPI RMW operations

[Brian W. Barrett]

If MPI_MODE_PASSIVE_EPOCH_IMPLICIT is not given, is synchronization  
explicit using the standard epoch functions?

Brian

On Mar 24, 2008, at 9:09 PM, Shipman, Galen M. wrote:

>
> Howard and I have been working on the RMW operations listed below for
> consideration.
>
> - Galen Shipman - ORNL
>
>
> Single operand RMW operations
>
> MPI_Rmw(void *operand_addr,
>                      int count,
>                     MPI_Datatype datatype,
>                     void *result_addr,
>                     int target_rank,
>                     MPI_Aint target_disp,
>                     int assert,
>                     MPI_RMW_Op op,
>                      MPI_Win win)
>
>
> Two operand RMW operations
>
> MPI_Rmw2(void *operand_addr,
>                        int count,
>                        MPI_Datatype datatype,
>                       void *operand2_addr,
>                       void *result_addr,
>                       int target_rank,
>                       MPI_Aint target_disp,
>                        int assert,
>                       MPI_RMW_2_Op op,
>                        MPI_Win win)
>
>
>
> MPI_RMW_Op Predefined RMW single operand operations
> The following predefined operations are supplied for MPI_RMW and  
> related
> functions. These operations are invoked  by placing the following  
> in op.
>
> Name             Meaning
>
> MPI_RMW_INC             increment
> MPI_RMW_PROD    product
> MPI_RMW_SUM             sum
> MPI_RMW_LAND    logical and
> MPI_RMW_LOR             logical or
> MPI_RMW_LXOR    logical xor
> MPI_RMW_BAND    binary and
> MPI_RMW_BOR             binary or
> MPI_RMW_BXOR    binary xor
> MPI_RMW_SWAP    swap value
>
> MPI_RMW_2_Op Predefined RMW two operand operations
>
> Name                                            Meaning
>
> MPI_RMW2_MASK_SWAP      swap masked bits
> MPI_RMW2_COMP_SWAP      compare and swap
>
> Note: MPI_RMW2_COMP_SWAP is an equality comparison, we may wish to
> consider multiple comparison operations such as >, >=, <, <=, ==, <>.
>
> Both MPI_Rmw and MPI_Rmw2 take an assert argument.
> When assert == MPI_MODE_PASSIVE_EPOCH_IMPLICIT MPI_Rmw/2 is
> equivalent to:
>
> MPI_Win_lock(target_rank,0,win);
> MPI_Rmw(.....);
> MPI_Win_unlock(target_rank,0,win);
>
> When assert  == MPI_MODE_PASSIVE_EPOCH_IMPLICIT | MPI_MODE_NOCHECK
> the MPI library knows that the window lock at the target need not be
> acquired.
>
>
>
>
> _______________________________________________
> mpi3-rma mailing list
> mpi3-rma at lists.mpi-forum.org
> http://lists.mpi-forum.org/mailman/listinfo.cgi/mpi3-rma
>

-- 
   Brian W. Barrett
   Dept. 1422: Scalable Computer Architectures
   Sandia National Laboratories