/[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 1.4 - (show annotations) (download)
Fri Mar 26 00:39:52 2004 UTC (18 years, 1 month ago) by cnh
Branch: MAIN
CVS Tags: HEAD
Changes since 1.3: +1 -1 lines
File MIME type: text/plain
FILE REMOVED
These all came back and so we are deleting them again. Fingers crossed!

1 C $Header: /u/gcmpack/MITgcm/verification/global_ocean.cs32x15/code/CPP_EEOPTIONS.h,v 1.3 2004/01/23 19:19:31 adcroft Exp $
2 C $Name: $
3
4 CBOP
5 C !ROUTINE: CPP_EEOPTIONS.h
6 C !INTERFACE:
7 C include "CPP_EEOPTIONS.h"
8 C
9 C !DESCRIPTION:
10 C *==========================================================*
11 C | CPP_EEOPTIONS.h |
12 C *==========================================================*
13 C | C preprocessor "execution environment" supporting |
14 C | flags. Use this file to set flags controlling the |
15 C | execution environment in which a model runs - as opposed |
16 C | to the dynamical problem the model solves. |
17 C | Note: Many options are implemented with both compile time|
18 C | and run-time switches. This allows options to be |
19 C | removed altogether, made optional at run-time or |
20 C | to be permanently enabled. This convention helps |
21 C | with the data-dependence analysis performed by the |
22 C | adjoint model compiler. This data dependency |
23 C | analysis can be upset by runtime switches that it |
24 C | is unable to recoginise as being fixed for the |
25 C | duration of an integration. |
26 C | A reasonable way to use these flags is to |
27 C | set all options as selectable at runtime but then |
28 C | once an experimental configuration has been |
29 C | identified, rebuild the code with the appropriate |
30 C | options set at compile time. |
31 C *==========================================================*
32 CEOP
33
34 #ifndef _CPP_EEOPTIONS_H_
35 #define _CPP_EEOPTIONS_H_
36
37 C In general the following convention applies:
38 C ALLOW - indicates an feature will be included but it may
39 C CAN have a run-time flag to allow it to be switched
40 C on and off.
41 C If ALLOW or CAN directives are "undef'd" this generally
42 C means that the feature will not be available i.e. it
43 C will not be included in the compiled code and so no
44 C run-time option to use the feature will be available.
45 C
46 C ALWAYS - indicates the choice will be fixed at compile time
47 C so no run-time option will be present
48
49 C Flag used to indicate whether Fortran formatted write
50 C and read are threadsafe. On SGI the routines can be thread
51 C safe, on Sun it is not possible - if you are unsure then
52 C undef this option.
53 #undef FMTFTN_IO_THREADSAFE
54
55 C-- Control MPI based parallel processing
56 CXXX We no longer select the use of MPI via this file (CPP_EEOPTIONS.h)
57 CXXX To use MPI, use an appropriate genmake2 options file or use
58 CXXX genmake2 -mpi .
59 CXXX #undef ALLOW_USE_MPI
60 CXXX #undef ALWAYS_USE_MPI
61
62 C-- Control use of communication that might overlap computation.
63 C Under MPI selects/deselects "non-blocking" sends and receives.
64 #define ALLOW_ASYNC_COMMUNICATION
65 #undef ALLOW_ASYNC_COMMUNICATION
66 #undef ALWAYS_USE_ASYNC_COMMUNICATION
67 C-- Control use of communication that is atomic to computation.
68 C Under MPI selects/deselects "blocking" sends and receives.
69 #define ALLOW_SYNC_COMMUNICATION
70 #undef ALWAYS_USE_SYNC_COMMUNICATION
71
72 C-- Control use of JAM routines for Artic network
73 C These invoke optimized versions of "exchange" and "sum" that
74 C utilize the programmable aspect of Artic cards.
75 #undef LETS_MAKE_JAM
76 #undef JAM_WITH_TWO_PROCS_PER_NODE
77
78 C-- Control storage of floating point operands
79 C On many systems it improves performance only to use
80 C 8-byte precision for time stepped variables.
81 C Constant in time terms ( geometric factors etc.. )
82 C can use 4-byte precision, reducing memory utilisation and
83 C boosting performance because of a smaller working
84 C set size. However, on vector CRAY systems this degrades
85 C performance.
86 #define REAL4_IS_SLOW
87
88 C-- Control use of "double" precision constants.
89 C Use D0 where it means REAL*8 but not where it means REAL*16
90 #define D0 d0
91
92 C-- Control XY periodicity in processor to grid mappings
93 C Note: Model code does not need to know whether a domain is
94 C periodic because it has overlap regions for every box.
95 C Model assume that these values have been
96 C filled in some way.
97 #undef ALWAYS_PREVENT_X_PERIODICITY
98 #undef ALWAYS_PREVENT_Y_PERIODICITY
99 #define CAN_PREVENT_X_PERIODICITY
100 #define CAN_PREVENT_Y_PERIODICITY
101
102 C-- Select the new EXCH2 (wrapper2) exchange software
103 C Note: this is a temporarily mis-named CPP-macro that will be renamed
104 C later.
105 #define USE_W2
106
107 #endif /* _CPP_EEOPTIONS_H_ */
108
109 #include "CPP_EEMACROS.h"

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