/[MITgcm]/MITgcm/verification/exp4/code/CPP_EEOPTIONS.h_mpi
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revision 1.1 by edhill, Wed Sep 10 02:25:46 2003 UTC revision 1.5 by jmc, Tue Aug 25 21:11:50 2015 UTC
# Line 1  Line 1 
1  C $Header$  C $Header$
2  C $Name$  C $Name$
3    
4    CBOP
5    C     !ROUTINE: CPP_EEOPTIONS.h
6    C     !INTERFACE:
7    C     include "CPP_EEOPTIONS.h"
8  C  C
9  C     /==========================================================\  C     !DESCRIPTION:
10  C     | CPP_EEOPTIONS.h                                          |  C     *==========================================================*
11  C     |==========================================================|  C     | CPP\_EEOPTIONS.h                                         |
12    C     *==========================================================*
13  C     | C preprocessor "execution environment" supporting        |  C     | C preprocessor "execution environment" supporting        |
14  C     | flags. Use this file to set flags controlling the        |  C     | flags. Use this file to set flags controlling the        |
15  C     | execution environment in which a model runs - as opposed |  C     | execution environment in which a model runs - as opposed |
# Line 22  C     |       set all options as selecta Line 28  C     |       set all options as selecta
28  C     |       once an experimental configuration has been        |  C     |       once an experimental configuration has been        |
29  C     |       identified, rebuild the code with the appropriate  |  C     |       identified, rebuild the code with the appropriate  |
30  C     |       options set at compile time.                       |  C     |       options set at compile time.                       |
31  C     \==========================================================/  C     *==========================================================*
32    CEOP
33    
34  #ifndef _CPP_EEOPTIONS_H_  #ifndef _CPP_EEOPTIONS_H_
35  #define _CPP_EEOPTIONS_H_  #define _CPP_EEOPTIONS_H_
# Line 39  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     Flag used to indicate whether Fortran formatted write  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
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
72  C     undef this option.  C     undef this option.
73  #undef  FMTFTN_IO_THREADSAFE  #undef FMTFTN_IO_THREAD_SAFE
74    
75    C--   Flag used to indicate whether Binary write to Local file (i.e.,
76    C     a different file for each tile) and read are thread-safe.
77    #undef LOCBIN_IO_THREAD_SAFE
78    
79    C--   Flag to turn off the writing of error message to ioUnit zero
80    #undef DISABLE_WRITE_TO_UNIT_ZERO
81    
82    C--   Alternative formulation of BYTESWAP, faster than
83    C     compiler flag -byteswapio on the Altix.
84    #undef FAST_BYTESWAP
85    
86    C--   Flag defined for eeboot_minimal.F, eeset_parms.F and open_copy_data_file.F
87    C     to write STDOUT, STDERR and scratch files from process 0 only.
88    C WARNING: to use only when absolutely confident that the setup is working
89    C     since any message (error/warning/print) from any proc <> 0 will be lost.
90    #undef SINGLE_DISK_IO
91    
92    C=== MPI, EXCH and GLOBAL_SUM related options ===
93    C--   Flag turns off MPI_SEND ready_to_receive polling in the
94    C     gather_* subroutines to speed up integrations.
95    #undef DISABLE_MPI_READY_TO_RECEIVE
96    
 C--   Control MPI based parallel processing  
 #define ALLOW_USE_MPI  
 #define ALWAYS_USE_MPI  
   
97  C--   Control use of communication that might overlap computation.  C--   Control use of communication that might overlap computation.
98  C     Under MPI selects/deselects "non-blocking" sends and receives.  C     Under MPI selects/deselects "non-blocking" sends and receives.
99  #define ALLOW_ASYNC_COMMUNICATION  #define ALLOW_ASYNC_COMMUNICATION
# Line 59  C     Under MPI selects/deselects "block Line 104  C     Under MPI selects/deselects "block
104  #define ALLOW_SYNC_COMMUNICATION  #define ALLOW_SYNC_COMMUNICATION
105  #undef  ALWAYS_USE_SYNC_COMMUNICATION  #undef  ALWAYS_USE_SYNC_COMMUNICATION
106    
 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  
   
107  C--   Control XY periodicity in processor to grid mappings  C--   Control XY periodicity in processor to grid mappings
108  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
109  C           periodic because it has overlap regions for every box.  C           periodic because it has overlap regions for every box.
110  C           Model assume that these values have been  C           Model assume that these values have been
111  C           filled in some way.  C           filled in some way.
# Line 89  C           filled in some way. Line 114  C           filled in some way.
114  #define CAN_PREVENT_X_PERIODICITY  #define CAN_PREVENT_X_PERIODICITY
115  #define CAN_PREVENT_Y_PERIODICITY  #define CAN_PREVENT_Y_PERIODICITY
116    
117    C--   disconnect tiles (no exchange between tiles, just fill-in edges
118    C     assuming locally periodic subdomain)
119    #undef DISCONNECTED_TILES
120    
121    C--   Always cumulate tile local-sum in the same order by applying MPI allreduce
122    C     to array of tiles ; can get slower with large number of tiles (big set-up)
123    #undef GLOBAL_SUM_ORDER_TILES
124    
125    C--   Alternative way of doing global sum without MPI allreduce call
126    C     but instead, explicit MPI send & recv calls. Expected to be slower.
127    #define GLOBAL_SUM_SEND_RECV
128    
129    C--   Alternative way of doing global sum on a single CPU
130    C     to eliminate tiling-dependent roundoff errors. Note: This is slow.
131    #undef  CG2D_SINGLECPU_SUM
132    
133    C=== Other options (to add/remove pieces of code) ===
134    C--   Flag to turn on checking for errors from all threads and procs
135    C     (calling S/R STOP_IF_ERROR) before stopping.
136    #define USE_ERROR_STOP
137    
138    C--   Control use of communication with other component:
139    C     allow to import and export from/to Coupler interface.
140    #undef COMPONENT_MODULE
141    
142  #endif /* _CPP_EEOPTIONS_H_ */  #endif /* _CPP_EEOPTIONS_H_ */
143    
144  #include "CPP_EEMACROS.h"  #include "CPP_EEMACROS.h"
145    
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