/[MITgcm]/MITgcm/verification/exp4/code/CPP_EEOPTIONS.h_mpi
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revision 1.3 by jmc, Mon May 18 19:32:49 2009 UTC revision 1.4 by jmc, Thu Mar 4 22:33:56 2010 UTC
# Line 46  C Line 46  C
46  C     ALWAYS - indicates the choice will be fixed at compile time  C     ALWAYS - indicates the choice will be fixed at compile time
47  C              so no run-time option will be present  C              so no run-time option will be present
48    
49    C=== Macro related options ===
50    C--   Control storage of floating point operands
51    C     On many systems it improves performance only to use
52    C     8-byte precision for time stepped variables.
53    C     Constant in time terms ( geometric factors etc.. )
54    C     can use 4-byte precision, reducing memory utilisation and
55    C     boosting performance because of a smaller working set size.
56    C     However, on vector CRAY systems this degrades performance.
57    C     Enable to switch REAL4_IS_SLOW from genmake2 (with LET_RS_BE_REAL4):
58    #ifdef LET_RS_BE_REAL4
59    #undef REAL4_IS_SLOW
60    #else /* LET_RS_BE_REAL4 */
61    #define REAL4_IS_SLOW
62    #endif /* LET_RS_BE_REAL4 */
63    
64    C--   Control use of "double" precision constants.
65    C     Use D0 where it means REAL*8 but not where it means REAL*16
66    #define D0 d0
67    
68    C=== IO related options ===
69  C--   Flag used to indicate whether Fortran formatted write  C--   Flag used to indicate whether Fortran formatted write
70  C     and read are threadsafe. On SGI the routines can be thread  C     and read are threadsafe. On SGI the routines can be thread
71  C     safe, on Sun it is not possible - if you are unsure then  C     safe, on Sun it is not possible - if you are unsure then
# Line 59  C     a different file for each tile) an Line 79  C     a different file for each tile) an
79  C--   Flag to turn off the writing of error message to ioUnit zero  C--   Flag to turn off the writing of error message to ioUnit zero
80  #undef DISABLE_WRITE_TO_UNIT_ZERO  #undef DISABLE_WRITE_TO_UNIT_ZERO
81    
82  C--   Flag to turn on checking for errors from all threads and procs  C--   Alternative formulation of BYTESWAP, faster than
83  C     (calling S/R STOP_IF_ERROR) before stopping.  C     compiler flag -byteswapio on the Altix.
84  #define USE_ERROR_STOP  #undef FAST_BYTESWAP
85    
86    C=== MPI, EXCH and GLOBAL_SUM related options ===
87  C--   Flag turns off MPI_SEND ready_to_receive polling in the  C--   Flag turns off MPI_SEND ready_to_receive polling in the
88  C     gather_* subroutines to speed up integrations.  C     gather_* subroutines to speed up integrations.
89  #undef DISABLE_MPI_READY_TO_RECEIVE  #undef DISABLE_MPI_READY_TO_RECEIVE
90    
 C--   Control MPI based parallel processing  
 CXXX We no longer select the use of MPI via this file (CPP_EEOPTIONS.h)  
 CXXX To use MPI, use an appropriate genmake2 options file or use  
 CXXX genmake2 -mpi .  
 CXXX #undef  ALLOW_USE_MPI  
 CXXX #undef  ALWAYS_USE_MPI  
   
91  C--   Control use of communication that might overlap computation.  C--   Control use of communication that might overlap computation.
92  C     Under MPI selects/deselects "non-blocking" sends and receives.  C     Under MPI selects/deselects "non-blocking" sends and receives.
93  #define ALLOW_ASYNC_COMMUNICATION  #define ALLOW_ASYNC_COMMUNICATION
# Line 84  C     Under MPI selects/deselects "block Line 98  C     Under MPI selects/deselects "block
98  #define ALLOW_SYNC_COMMUNICATION  #define ALLOW_SYNC_COMMUNICATION
99  #undef  ALWAYS_USE_SYNC_COMMUNICATION  #undef  ALWAYS_USE_SYNC_COMMUNICATION
100    
 C--   Control use of JAM routines for Artic network  
 C     These invoke optimized versions of "exchange" and "sum" that  
 C     utilize the programmable aspect of Artic cards.  
 #undef  LETS_MAKE_JAM  
 #undef  JAM_WITH_TWO_PROCS_PER_NODE  
   
 C--   Control storage of floating point operands  
 C     On many systems it improves performance only to use  
 C     8-byte precision for time stepped variables.  
 C     Constant in time terms ( geometric factors etc.. )  
 C     can use 4-byte precision, reducing memory utilisation and  
 C     boosting performance because of a smaller working  
 C     set size. However, on vector CRAY systems this degrades  
 C     performance.  
 #define REAL4_IS_SLOW  
   
 C--   Control use of "double" precision constants.  
 C     Use D0 where it means REAL*8 but not where it means REAL*16  
 #define D0 d0  
   
101  C--   Control XY periodicity in processor to grid mappings  C--   Control XY periodicity in processor to grid mappings
102  C     Note: Model code does not need to know whether a domain is  C     Note: Model code does not need to know whether a domain is
103  C           periodic because it has overlap regions for every box.  C           periodic because it has overlap regions for every box.
# Line 114  C           filled in some way. Line 108  C           filled in some way.
108  #define CAN_PREVENT_X_PERIODICITY  #define CAN_PREVENT_X_PERIODICITY
109  #define CAN_PREVENT_Y_PERIODICITY  #define CAN_PREVENT_Y_PERIODICITY
110    
 C--   Alternative formulation of BYTESWAP, faster than  
 C     compiler flag -byteswapio on the Altix.  
 #undef FAST_BYTESWAP  
   
111  C--   Alternative way of doing global sum without MPI allreduce call  C--   Alternative way of doing global sum without MPI allreduce call
112  C     but instead, explicit MPI send & recv calls.  C     but instead, explicit MPI send & recv calls.
113  #define GLOBAL_SUM_SEND_RECV  #define GLOBAL_SUM_SEND_RECV
# Line 127  C     to eliminate tiling-dependent roun Line 117  C     to eliminate tiling-dependent roun
117  C     Note: This is slow.  C     Note: This is slow.
118  #undef  CG2D_SINGLECPU_SUM  #undef  CG2D_SINGLECPU_SUM
119    
120    C=== Other options (to add/remove pieces of code) ===
121    C--   Flag to turn on checking for errors from all threads and procs
122    C     (calling S/R STOP_IF_ERROR) before stopping.
123    #define USE_ERROR_STOP
124    
125    C--   Control use of communication with other component:
126    C     allow to import and export from/to Coupler interface.
127    #undef COMPONENT_MODULE
128    
129  #endif /* _CPP_EEOPTIONS_H_ */  #endif /* _CPP_EEOPTIONS_H_ */
130    
131  #include "CPP_EEMACROS.h"  #include "CPP_EEMACROS.h"
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