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C $Header: /u/gcmpack/MITgcm/eesupp/src/ini_jam.F,v 1.6 2004/03/27 03:51:51 edhill Exp $ |
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C $Name: $ |
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#include "CPP_EEOPTIONS.h" |
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#define USE_JAM_INIT |
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CBOP |
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C !ROUTINE: INI_JAM |
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C !INTERFACE: |
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SUBROUTINE INI_JAM |
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IMPLICIT NONE |
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C !DESCRIPTION: |
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C *=================================================================================* |
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C | SUBROUTINE INI\_JAM |
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C | o Initialise JAM based communication |
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C *=================================================================================* |
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C | Connect to synchronising daemon process that allocates jam network ids to |
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C | each process and initialises network once all processes are connected. |
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C *=================================================================================* |
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C !USES: |
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C == Global data == |
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#ifdef LETS_MAKE_JAM |
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#include "SIZE.h" |
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#include "EEPARAMS.h" |
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#include "EESUPPORT.h" |
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#include "JAM_INFO.h" |
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#include "MPI_INFO.h" |
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#ifdef ALLOW_MPI |
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#include "mpif.h" |
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#endif |
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C !LOCAL VARIABLES: |
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C == Local variables == |
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C dummyVal :: Variable which is used in sync. call |
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C rc :: Return code |
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C myTwoProcRank :: Temp. for holding ranking within processor pairs. |
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Real*8 dummyVal |
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INTEGER rc |
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#ifdef JAM_WITH_TWO_PROCS_PER_NODE |
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INTEGER myTwoProcRank |
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#endif |
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CEOP |
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C Names used in JAM exch testing for MPI based exchange |
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mpi_northId = mpiPidN |
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mpi_southId = mpiPidS |
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#ifdef USE_JAM_INIT |
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C JAM initialisation. This should work with or without |
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C MPI. If we dont use MPI we have to start procs. by hand |
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C though! |
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#ifndef JAM_WITH_TWO_PROCS_PER_NODE |
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CALL JAM_collective_init |
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#else /* ! JAM_WITH_TWO_PROCS_PER_NODE */ |
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myTwoProcRank = MOD(myProcId,2) |
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IF ( myTwoProcRank .EQ. 0 ) THEN |
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myTwoProcRank = 1 |
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ELSE |
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myTwoProcRank = 0 |
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ENDIF |
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CALL JAM_collective_init( myTwoProcRank ) |
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#endif /* JAM_WITH_TWO_PROCS_PER_NODE */ |
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CALL GET_JAM_self_address( jam_pid ) |
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CALL GET_JAM_partition_size( jam_np ) |
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jam_exchKey = 100 |
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dummyVal = 0. |
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CALL JAM_barrier_start( dummyVal ) |
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CALL JAM_barrier_done( dummyVal ) |
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|
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C Set up connectivity |
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jam_northId = jam_pid+1 |
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IF ( jam_northId .EQ. jam_np ) jam_northId = 0 |
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jam_southId = jam_pid-1 |
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IF ( jam_southId .LT. 0 ) jam_southId = jam_np-1 |
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numberOfProcs = jam_np |
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myProcId = jam_pid |
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#ifdef JAM_WITH_TWO_PROCS_PER_NODE |
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C The following fixes the instance where MPI and |
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C James JAM arrive at a different id for this process |
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C *note* this assumes nPx=1 (no parallization in X) |
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myPid = jam_pid |
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pidN = mod(jam_pid+1,jam_np) |
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pidS = mod(jam_pid-1+jam_np,jam_np) |
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pidW = jam_pid |
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pidE = jam_pid |
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myYGlobalLo = sNy*nSy*jam_pid+1 |
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myXGlobalLo = 1 |
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#endif |
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#endif |
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#endif /* LETS_MAKE_JAM */ |
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RETURN |
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END |
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