/[MITgcm]/MITgcm/verification/exp5/code/CPP_EEOPTIONS.h_nompi
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Revision 1.1 - (hide annotations) (download)
Wed Sep 10 02:25:46 2003 UTC (18 years, 4 months ago) by edhill
Branch: MAIN
CVS Tags: checkpoint51f_post, checkpoint51l_post, checkpoint51k_post, checkpoint51o_post, branchpoint-genmake2, checkpoint51j_post, checkpoint51q_post, checkpoint52a_pre, branch-netcdf, checkpoint51r_post, checkpoint52, checkpoint52b_pre, checkpoint51o_pre, checkpoint51t_post, checkpoint52a_post, checkpoint51i_post, checkpoint52b_post, checkpoint51n_pre, checkpoint52c_post, checkpoint51p_post, checkpoint51n_post, checkpoint51h_pre, checkpoint51i_pre, checkpoint51l_pre, checkpoint51u_post, checkpoint51g_post, checkpoint51m_post, ecco_c52_e35, checkpoint51s_post
Branch point for: checkpoint51n_branch, branch-nonh, tg2-branch, branch-genmake2
initial checkin of *.h_[no]mpi files for both uni-process and mpi-enabled
verification runs

1 edhill 1.1 C $Header: /u/u3/gcmpack/MITgcm/verification/exp5/code/CPP_EEOPTIONS.h,v 1.5 2001/02/04 14:38:52 cnh Exp $
2     C $Name: $
3     C
4     C /==========================================================\
5     C | CPP_EEOPTIONS.h |
6     C |==========================================================|
7     C | C preprocessor "execution environment" supporting |
8     C | flags. Use this file to set flags controlling the |
9     C | execution environment in which a model runs - as opposed |
10     C | to the dynamical problem the model solves. |
11     C | Note: Many options are implemented with both compile time|
12     C | and run-time switches. This allows options to be |
13     C | removed altogether, made optional at run-time or |
14     C | to be permanently enabled. This convention helps |
15     C | with the data-dependence analysis performed by the |
16     C | adjoint model compiler. This data dependency |
17     C | analysis can be upset by runtime switches that it |
18     C | is unable to recoginise as being fixed for the |
19     C | duration of an integration. |
20     C | A reasonable way to use these flags is to |
21     C | set all options as selectable at runtime but then |
22     C | once an experimental configuration has been |
23     C | identified, rebuild the code with the appropriate |
24     C | options set at compile time. |
25     C \==========================================================/
26    
27     #ifndef _CPP_EEOPTIONS_H_
28     #define _CPP_EEOPTIONS_H_
29    
30     C In general the following convention applies:
31     C ALLOW - indicates an feature will be included but it may
32     C CAN have a run-time flag to allow it to be switched
33     C on and off.
34     C If ALLOW or CAN directives are "undef'd" this generally
35     C means that the feature will not be available i.e. it
36     C will not be included in the compiled code and so no
37     C run-time option to use the feature will be available.
38     C
39     C ALWAYS - indicates the choice will be fixed at compile time
40     C so no run-time option will be present
41    
42     C Flag used to indicate whether Fortran formatted write
43     C and read are threadsafe. On SGI the routines can be thread
44     C safe, on Sun it is not possible - if you are unsure then
45     C undef this option.
46     #undef FMTFTN_IO_THREADSAFE
47    
48     C-- Control MPI based parallel processing
49     #undef ALLOW_USE_MPI
50     #undef ALWAYS_USE_MPI
51    
52     C-- Control use of communication that might overlap computation.
53     C Under MPI selects/deselects "non-blocking" sends and receives.
54     #define ALLOW_ASYNC_COMMUNICATION
55     #undef ALLOW_ASYNC_COMMUNICATION
56     #undef ALWAYS_USE_ASYNC_COMMUNICATION
57     C-- Control use of communication that is atomic to computation.
58     C Under MPI selects/deselects "blocking" sends and receives.
59     #define ALLOW_SYNC_COMMUNICATION
60     #undef ALWAYS_USE_SYNC_COMMUNICATION
61    
62     C-- Control use of JAM routines for Artic network
63     C These invoke optimized versions of "exchange" and "sum" that
64     C utilize the programmable aspect of Artic cards.
65     #undef LETS_MAKE_JAM
66     #undef JAM_WITH_TWO_PROCS_PER_NODE
67    
68     C-- Control storage of floating point operands
69     C On many systems it improves performance only to use
70     C 8-byte precision for time stepped variables.
71     C Constant in time terms ( geometric factors etc.. )
72     C can use 4-byte precision, reducing memory utilisation and
73     C boosting performance because of a smaller working
74     C set size. However, on vector CRAY systems this degrades
75     C performance.
76     #define REAL4_IS_SLOW
77    
78     C-- Control use of "double" precision constants.
79     C Use D0 where it means REAL*8 but not where it means REAL*16
80     #define D0 d0
81    
82     C-- Control XY periodicity in processor to grid mappings
83     C Note: Model code does not need to know whether a domain is
84     C periodic because it has overlap regions for every box.
85     C Model assume that these values have been
86     C filled in some way.
87     #undef ALWAYS_PREVENT_X_PERIODICITY
88     #undef ALWAYS_PREVENT_Y_PERIODICITY
89     #define CAN_PREVENT_X_PERIODICITY
90     #define CAN_PREVENT_Y_PERIODICITY
91    
92     #endif /* _CPP_EEOPTIONS_H_ */
93    
94     #include "CPP_EEMACROS.h"

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