/[MITgcm]/MITgcm/verification/global_with_CFC11/code1x1/CPP_EEOPTIONS.h
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Revision 1.1.2.1 - (hide annotations) (download)
Thu Aug 25 16:22:17 2005 UTC (18 years, 7 months ago) by dimitri
Branch: release1_50yr
Changes since 1.1: +95 -0 lines
File MIME type: text/plain
adding ecco1x1 verification/global_with_CFC11 experiment

1 dimitri 1.1.2.1 C $Header: /u/gcmpack/MITgcm/verification/global_with_CFC11/code50yr/Attic/CPP_EEOPTIONS.h,v 1.1.2.2 2003/05/03 17:48:35 dimitri Exp $
2     C $Name: release1_50yr $
3    
4     C
5     C /==========================================================\
6     C | CPP_EEOPTIONS.h |
7     C |==========================================================|
8     C | C preprocessor "execution environment" supporting |
9     C | flags. Use this file to set flags controlling the |
10     C | execution environment in which a model runs - as opposed |
11     C | to the dynamical problem the model solves. |
12     C | Note: Many options are implemented with both compile time|
13     C | and run-time switches. This allows options to be |
14     C | removed altogether, made optional at run-time or |
15     C | to be permanently enabled. This convention helps |
16     C | with the data-dependence analysis performed by the |
17     C | adjoint model compiler. This data dependency |
18     C | analysis can be upset by runtime switches that it |
19     C | is unable to recoginise as being fixed for the |
20     C | duration of an integration. |
21     C | A reasonable way to use these flags is to |
22     C | set all options as selectable at runtime but then |
23     C | once an experimental configuration has been |
24     C | identified, rebuild the code with the appropriate |
25     C | options set at compile time. |
26     C \==========================================================/
27    
28     #ifndef _CPP_EEOPTIONS_H_
29     #define _CPP_EEOPTIONS_H_
30    
31     C In general the following convention applies:
32     C ALLOW - indicates an feature will be included but it may
33     C CAN have a run-time flag to allow it to be switched
34     C on and off.
35     C If ALLOW or CAN directives are "undef'd" this generally
36     C means that the feature will not be available i.e. it
37     C will not be included in the compiled code and so no
38     C run-time option to use the feature will be available.
39     C
40     C ALWAYS - indicates the choice will be fixed at compile time
41     C so no run-time option will be present
42    
43     C Flag used to indicate whether Fortran formatted write
44     C and read are threadsafe. On SGI the routines can be thread
45     C safe, on Sun it is not possible - if you are unsure then
46     C undef this option.
47     #undef FMTFTN_IO_THREADSAFE
48    
49     C-- Control MPI based parallel processing
50     #define ALLOW_USE_MPI
51     #define ALWAYS_USE_MPI
52    
53     C-- Control use of communication that might overlap computation.
54     C Under MPI selects/deselects "non-blocking" sends and receives.
55     #define ALLOW_ASYNC_COMMUNICATION
56     #undef ALLOW_ASYNC_COMMUNICATION
57     #undef ALWAYS_USE_ASYNC_COMMUNICATION
58     C-- Control use of communication that is atomic to computation.
59     C Under MPI selects/deselects "blocking" sends and receives.
60     #define ALLOW_SYNC_COMMUNICATION
61     #undef ALWAYS_USE_SYNC_COMMUNICATION
62    
63     C-- Control use of JAM routines for Artic network
64     C These invoke optimized versions of "exchange" and "sum" that
65     C utilize the programmable aspect of Artic cards.
66     #undef LETS_MAKE_JAM
67     #undef JAM_WITH_TWO_PROCS_PER_NODE
68    
69     C-- Control storage of floating point operands
70     C On many systems it improves performance only to use
71     C 8-byte precision for time stepped variables.
72     C Constant in time terms ( geometric factors etc.. )
73     C can use 4-byte precision, reducing memory utilisation and
74     C boosting performance because of a smaller working
75     C set size. However, on vector CRAY systems this degrades
76     C performance.
77     #define REAL4_IS_SLOW
78    
79     C-- Control use of "double" precision constants.
80     C Use D0 where it means REAL*8 but not where it means REAL*16
81     #define D0 d0
82    
83     C-- Control XY periodicity in processor to grid mappings
84     C Note: Model code does not need to know whether a domain is
85     C periodic because it has overlap regions for every box.
86     C Model assume that these values have been
87     C filled in some way.
88     #undef ALWAYS_PREVENT_X_PERIODICITY
89     #undef ALWAYS_PREVENT_Y_PERIODICITY
90     #define CAN_PREVENT_X_PERIODICITY
91     #define CAN_PREVENT_Y_PERIODICITY
92    
93     #endif /* _CPP_EEOPTIONS_H_ */
94    
95     #include "CPP_EEMACROS.h"

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