/[MITgcm]/MITgcm/verification/exp5/code/CPP_EEOPTIONS.h_mpi
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Revision 1.1 - (show annotations) (download)
Wed Sep 10 02:25:46 2003 UTC (17 years, 9 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, checkpoint52e_pre, checkpoint51r_post, checkpoint52, checkpoint52b_pre, checkpoint52d_post, checkpoint51o_pre, checkpoint51t_post, checkpoint52a_post, checkpoint51i_post, checkpoint52e_post, checkpoint52b_post, checkpoint51n_pre, checkpoint52f_post, checkpoint52c_post, checkpoint51p_post, checkpoint51n_post, checkpoint51h_pre, checkpoint51i_pre, checkpoint51l_pre, checkpoint51u_post, checkpoint52h_pre, checkpoint51g_post, checkpoint52f_pre, ecco_c52_e35, checkpoint51m_post, checkpoint51s_post
Branch point for: checkpoint51n_branch, netcdf-sm0, branch-nonh, tg2-branch, branch-genmake2
initial checkin of *.h_[no]mpi files for both uni-process and mpi-enabled
verification runs

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 #define ALLOW_USE_MPI
50 #define 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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