/[MITgcm]/MITgcm/eesupp/inc/CPP_EEOPTIONS.h
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revision 1.26 by dimitri, Thu Oct 19 06:54:23 2006 UTC revision 1.35 by jmc, Thu Sep 6 21:55:59 2012 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--   Enable some old macro conventions for backward compatibility
69    #undef USE_OLD_MACROS_R4R8toRSRL
70    
71    C=== IO related options ===
72  C--   Flag used to indicate whether Fortran formatted write  C--   Flag used to indicate whether Fortran formatted write
73  C     and read are threadsafe. On SGI the routines can be thread  C     and read are threadsafe. On SGI the routines can be thread
74  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 82  C     a different file for each tile) an
82  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
83  #undef DISABLE_WRITE_TO_UNIT_ZERO  #undef DISABLE_WRITE_TO_UNIT_ZERO
84    
85    C--   Alternative formulation of BYTESWAP, faster than
86    C     compiler flag -byteswapio on the Altix.
87    #undef FAST_BYTESWAP
88    
89    C=== MPI, EXCH and GLOBAL_SUM related options ===
90  C--   Flag turns off MPI_SEND ready_to_receive polling in the  C--   Flag turns off MPI_SEND ready_to_receive polling in the
91  C     gather_* subroutines to speed up integrations.  C     gather_* subroutines to speed up integrations.
92  #undef DISABLE_MPI_READY_TO_RECEIVE  #undef DISABLE_MPI_READY_TO_RECEIVE
# Line 68  CXXX We no longer select the use of MPI Line 96  CXXX We no longer select the use of MPI
96  CXXX To use MPI, use an appropriate genmake2 options file or use  CXXX To use MPI, use an appropriate genmake2 options file or use
97  CXXX genmake2 -mpi .  CXXX genmake2 -mpi .
98  CXXX #undef  ALLOW_USE_MPI  CXXX #undef  ALLOW_USE_MPI
 CXXX #undef  ALWAYS_USE_MPI  
99    
100  C--   Control use of communication that might overlap computation.  C--   Control use of communication that might overlap computation.
101  C     Under MPI selects/deselects "non-blocking" sends and receives.  C     Under MPI selects/deselects "non-blocking" sends and receives.
# Line 83  C     Under MPI selects/deselects "block Line 110  C     Under MPI selects/deselects "block
110  C--   Control use of JAM routines for Artic network  C--   Control use of JAM routines for Artic network
111  C     These invoke optimized versions of "exchange" and "sum" that  C     These invoke optimized versions of "exchange" and "sum" that
112  C     utilize the programmable aspect of Artic cards.  C     utilize the programmable aspect of Artic cards.
113  #undef  LETS_MAKE_JAM  CXXX No longer supported ; started to remove JAM routines.
114  #undef  JAM_WITH_TWO_PROCS_PER_NODE  CXXX #undef  LETS_MAKE_JAM
115    CXXX #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  
116    
117  C--   Control XY periodicity in processor to grid mappings  C--   Control XY periodicity in processor to grid mappings
118  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
# Line 110  C           filled in some way. Line 124  C           filled in some way.
124  #define CAN_PREVENT_X_PERIODICITY  #define CAN_PREVENT_X_PERIODICITY
125  #define CAN_PREVENT_Y_PERIODICITY  #define CAN_PREVENT_Y_PERIODICITY
126    
127    C--   disconnect tiles (no exchange between tiles, just fill-in edges
128    C     assuming locally periodic subdomain)
129    #undef DISCONNECTED_TILES
130    
131    C--   Alternative way of doing global sum without MPI allreduce call
132    C     but instead, explicit MPI send & recv calls.
133    #undef GLOBAL_SUM_SEND_RECV
134    
135    C--   Alternative way of doing global sum on a single CPU
136    C     to eliminate tiling-dependent roundoff errors.
137    C     Note: This is slow.
138    #undef  CG2D_SINGLECPU_SUM
139    
140    C=== Other options (to add/remove pieces of code) ===
141    C--   Flag to turn on checking for errors from all threads and procs
142    C     (calling S/R STOP_IF_ERROR) before stopping.
143    #define USE_ERROR_STOP
144    
145    C--   Control use of communication with other component:
146    C     allow to import and export from/to Coupler interface.
147    #undef COMPONENT_MODULE
148    
149  #endif /* _CPP_EEOPTIONS_H_ */  #endif /* _CPP_EEOPTIONS_H_ */
150    
151  #include "CPP_EEMACROS.h"  #include "CPP_EEMACROS.h"
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