/[MITgcm]/MITgcm/verification/global_ocean.cs32x15/code/CPP_EEOPTIONS.h
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Contents of /MITgcm/verification/global_ocean.cs32x15/code/CPP_EEOPTIONS.h

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Revision 1.1 - (show annotations) (download)
Fri Oct 3 15:54:46 2003 UTC (18 years, 3 months ago) by jmc
Branch: MAIN
CVS Tags: checkpoint51l_post, checkpoint51k_post, checkpoint51o_post, checkpoint51j_post, checkpoint51q_post, checkpoint52a_pre, branch-netcdf, checkpoint52e_pre, checkpoint51r_post, checkpoint52, checkpoint52b_pre, checkpoint52d_post, ecco_c52_e35, checkpoint51o_pre, checkpoint51t_post, checkpoint52a_post, checkpoint51i_post, checkpoint52e_post, checkpoint52b_post, checkpoint51n_pre, checkpoint52f_post, checkpoint52c_post, checkpoint51p_post, checkpoint51n_post, checkpoint52d_pre, checkpoint51h_pre, checkpoint51i_pre, checkpoint51l_pre, checkpoint51u_post, checkpoint52f_pre, hrcube_1, checkpoint51m_post, checkpoint51s_post
Branch point for: checkpoint51n_branch, netcdf-sm0, branch-nonh, tg2-branch
File MIME type: text/plain
new experiment: cubed-sphere ocean (cs32 x 15 levels).

1 C $Header: $
2 C $Name: $
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 #undef ALLOW_USE_MPI
51 #undef 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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