/[MITgcm]/MITgcm/verification/global2x2_tot/code/CPP_EEOPTIONS.h
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Revision 1.1.2.1 - (hide annotations) (download)
Thu Apr 4 12:05:47 2002 UTC (20 years, 3 months ago) by heimbach
Branch: ecco-branch
CVS Tags: ecco_c51_e34d, ecco_c51_e34e, ecco_c51_e34f, ecco_c51_e34g, ecco_c51_e34a, ecco_c51_e34b, ecco_c51_e34c, ecco_c51_e34, ecco_c50_e29, ecco_c50_e28, ecco_c44_e23, ecco_c44_e26, ecco_c44_e27, ecco_c44_e24, ecco_c44_e25, icebear5, icebear4, icebear3, icebear2, ecco_c50_e33a, ecco_c50_e32, ecco_c50_e33, ecco_c50_e30, ecco_c50_e31, ecco_ice2, ecco_ice1
Branch point for: icebear, c24_e25_ice
Changes since 1.1: +93 -0 lines
File MIME type: text/plain
Adding global 2x2 deg. configuration to repository.

1 heimbach 1.1.2.1 C $Header: /u/gcmpack/development/heimbach/ecco_env/eesupp/inc/CPP_EEOPTIONS.h,v 1.3 2000/10/23 16:31:48 heimbach Exp $
2     C
3     C /==========================================================\
4     C | CPP_EEOPTIONS.h |
5     C |==========================================================|
6     C | C preprocessor "execution environment" supporting |
7     C | flags. Use this file to set flags controlling the |
8     C | execution environment in which a model runs - as opposed |
9     C | to the dynamical problem the model solves. |
10     C | Note: Many options are implemented with both compile time|
11     C | and run-time switches. This allows options to be |
12     C | removed altogether, made optional at run-time or |
13     C | to be permanently enabled. This convention helps |
14     C | with the data-dependence analysis performed by the |
15     C | adjoint model compiler. This data dependency |
16     C | analysis can be upset by runtime switches that it |
17     C | is unable to recoginise as being fixed for the |
18     C | duration of an integration. |
19     C | A reasonable way to use these flags is to |
20     C | set all options as selectable at runtime but then |
21     C | once an experimental configuration has been |
22     C | identified, rebuild the code with the appropriate |
23     C | options set at compile time. |
24     C \==========================================================/
25    
26     #ifndef _CPP_EEOPTIONS_H_
27     #define _CPP_EEOPTIONS_H_
28    
29     C In general the following convention applies:
30     C ALLOW - indicates an feature will be included but it may
31     C CAN have a run-time flag to allow it to be switched
32     C on and off.
33     C If ALLOW or CAN directives are "undef'd" this generally
34     C means that the feature will not be available i.e. it
35     C will not be included in the compiled code and so no
36     C run-time option to use the feature will be available.
37     C
38     C ALWAYS - indicates the choice will be fixed at compile time
39     C so no run-time option will be present
40    
41     C Flag used to indicate whether Fortran formatted write
42     C and read are threadsafe. On SGI the routines can be thread
43     C safe, on Sun it is not possible - if you are unsure then
44     C undef this option.
45     #undef FMTFTN_IO_THREADSAFE
46    
47     C-- Control MPI based parallel processing
48     #define ALLOW_USE_MPI
49     #define ALWAYS_USE_MPI
50    
51     C-- Control use of communication that might overlap computation.
52     C Under MPI selects/deselects "non-blocking" sends and receives.
53     #define ALLOW_ASYNC_COMMUNICATION
54     #undef ALLOW_ASYNC_COMMUNICATION
55     #undef ALWAYS_USE_ASYNC_COMMUNICATION
56     C-- Control use of communication that is atomic to computation.
57     C Under MPI selects/deselects "blocking" sends and receives.
58     #define ALLOW_SYNC_COMMUNICATION
59     #undef ALWAYS_USE_SYNC_COMMUNICATION
60    
61     C-- Control use of JAM routines for Artic network
62     C These invoke optimized versions of "exchange" and "sum" that
63     C utilize the programmable aspect of Artic cards.
64     #undef LETS_MAKE_JAM
65     #undef JAM_WITH_TWO_PROCS_PER_NODE
66    
67     C-- Control storage of floating point operands
68     C On many systems it improves performance only to use
69     C 8-byte precision for time stepped variables.
70     C Constant in time terms ( geometric factors etc.. )
71     C can use 4-byte precision, reducing memory utilisation and
72     C boosting performance because of a smaller working
73     C set size. However, on vector CRAY systems this degrades
74     C performance.
75     #define REAL4_IS_SLOW
76    
77     C-- Control use of "double" precision constants.
78     C Use D0 where it means REAL*8 but not where it means REAL*16
79     #define D0 d0
80    
81     C-- Control XY periodicity in processor to grid mappings
82     C Note: Model code does not need to know whether a domain is
83     C periodic because it has overlap regions for every box.
84     C Model assume that these values have been
85     C filled in some way.
86     #undef ALWAYS_PREVENT_X_PERIODICITY
87     #undef ALWAYS_PREVENT_Y_PERIODICITY
88     #define CAN_PREVENT_X_PERIODICITY
89     #define CAN_PREVENT_Y_PERIODICITY
90    
91     #endif /* _CPP_EEOPTIONS_H_ */
92    
93     #include "CPP_EEMACROS.h"

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