/[MITgcm]/MITgcm/verification/global2x2_tot/code/CPP_EEOPTIONS.h
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Revision 1.2 - (show annotations) (download)
Thu Nov 6 22:28:42 2003 UTC (18 years, 11 months ago) by heimbach
Branch: MAIN
CVS Tags: checkpoint52a_pre, branch-netcdf, checkpoint52e_pre, checkpoint52, checkpoint52b_pre, checkpoint52d_post, checkpoint52a_post, checkpoint52e_post, checkpoint52b_post, checkpoint52f_post, checkpoint52c_post, checkpoint51u_post, checkpoint52h_pre, checkpoint52f_pre, ecco_c52_e35
Branch point for: netcdf-sm0
Changes since 1.1: +93 -0 lines
File MIME type: text/plain
o merging from ecco-branch
o adding ECCO global 1x1 and 2x2 degree configs

1 C $Header: /u/gcmpack/MITgcm/verification/global2x2_tot/code/Attic/CPP_EEOPTIONS.h,v 1.1.2.1 2002/04/04 12:05:47 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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