/[MITgcm]/MITgcm/verification/cpl_atm2d+ocn/code_ocn/CPP_EEOPTIONS.h
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Revision 1.3 - (show annotations) (download)
Fri Mar 5 00:40:40 2010 UTC (12 years, 2 months ago) by jmc
Branch: MAIN
CVS Tags: checkpoint64y, checkpoint64x, checkpoint64z, checkpoint64q, checkpoint64p, checkpoint64s, checkpoint64r, checkpoint64u, checkpoint64t, checkpoint64w, checkpoint64v, checkpoint64i, checkpoint64h, checkpoint64k, checkpoint64j, checkpoint64m, checkpoint64l, checkpoint64o, checkpoint64n, checkpoint64a, checkpoint64c, checkpoint64b, checkpoint64e, checkpoint64d, checkpoint64g, checkpoint64f, checkpoint63p, checkpoint63q, checkpoint63r, checkpoint63s, checkpoint63l, checkpoint63m, checkpoint63n, checkpoint63o, checkpoint63h, checkpoint63i, checkpoint63j, checkpoint63k, checkpoint63d, checkpoint63e, checkpoint63f, checkpoint63g, checkpoint63a, checkpoint63b, checkpoint63c, checkpoint64, checkpoint65, checkpoint63, checkpoint65j, checkpoint65k, checkpoint65h, checkpoint65i, checkpoint65n, checkpoint65l, checkpoint65m, checkpoint65b, checkpoint65c, checkpoint65a, checkpoint65f, checkpoint65g, checkpoint65d, checkpoint65e, checkpoint62g, checkpoint62f, checkpoint62e, checkpoint62d, checkpoint62k, checkpoint62j, checkpoint62i, checkpoint62h, checkpoint62o, checkpoint62n, checkpoint62m, checkpoint62l, checkpoint62s, checkpoint62r, checkpoint62q, checkpoint62p, checkpoint62w, checkpoint62v, checkpoint62u, checkpoint62t, checkpoint62z, checkpoint62y, checkpoint62x
Changes since 1.2: +34 -40 lines
File MIME type: text/plain
import updates from default version (in eesupp/inc)

1 C $Header: /u/gcmpack/MITgcm/eesupp/inc/CPP_EEOPTIONS.h,v 1.32 2009/05/25 04:33:15 heimbach 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=== Macro related options ===
50 C-- Control storage of floating point operands
51 C On many systems it improves performance only to use
52 C 8-byte precision for time stepped variables.
53 C Constant in time terms ( geometric factors etc.. )
54 C can use 4-byte precision, reducing memory utilisation and
55 C boosting performance because of a smaller working set size.
56 C However, on vector CRAY systems this degrades performance.
57 C Enable to switch REAL4_IS_SLOW from genmake2 (with LET_RS_BE_REAL4):
58 #ifdef LET_RS_BE_REAL4
59 #undef REAL4_IS_SLOW
60 #else /* LET_RS_BE_REAL4 */
61 #define REAL4_IS_SLOW
62 #endif /* LET_RS_BE_REAL4 */
63
64 C-- Control use of "double" precision constants.
65 C Use D0 where it means REAL*8 but not where it means REAL*16
66 #define D0 d0
67
68 C=== IO related options ===
69 C-- Flag used to indicate whether Fortran formatted write
70 C and read are threadsafe. On SGI the routines can be thread
71 C safe, on Sun it is not possible - if you are unsure then
72 C undef this option.
73 #undef FMTFTN_IO_THREAD_SAFE
74
75 C-- Flag used to indicate whether Binary write to Local file (i.e.,
76 C a different file for each tile) and read are thread-safe.
77 #undef LOCBIN_IO_THREAD_SAFE
78
79 C-- Flag to turn off the writing of error message to ioUnit zero
80 #undef DISABLE_WRITE_TO_UNIT_ZERO
81
82 C-- Alternative formulation of BYTESWAP, faster than
83 C compiler flag -byteswapio on the Altix.
84 #undef FAST_BYTESWAP
85
86 C=== MPI, EXCH and GLOBAL_SUM related options ===
87 C-- Flag turns off MPI_SEND ready_to_receive polling in the
88 C gather_* subroutines to speed up integrations.
89 #undef DISABLE_MPI_READY_TO_RECEIVE
90
91 C-- Control use of communication that might overlap computation.
92 C Under MPI selects/deselects "non-blocking" sends and receives.
93 #define ALLOW_ASYNC_COMMUNICATION
94 #undef ALLOW_ASYNC_COMMUNICATION
95 #undef ALWAYS_USE_ASYNC_COMMUNICATION
96 C-- Control use of communication that is atomic to computation.
97 C Under MPI selects/deselects "blocking" sends and receives.
98 #define ALLOW_SYNC_COMMUNICATION
99 #undef ALWAYS_USE_SYNC_COMMUNICATION
100
101 C-- Control XY periodicity in processor to grid mappings
102 C Note: Model code does not need to know whether a domain is
103 C periodic because it has overlap regions for every box.
104 C Model assume that these values have been
105 C filled in some way.
106 #undef ALWAYS_PREVENT_X_PERIODICITY
107 #undef ALWAYS_PREVENT_Y_PERIODICITY
108 #define CAN_PREVENT_X_PERIODICITY
109 #define CAN_PREVENT_Y_PERIODICITY
110
111 C-- Alternative way of doing global sum without MPI allreduce call
112 C but instead, explicit MPI send & recv calls.
113 #undef GLOBAL_SUM_SEND_RECV
114
115 C-- Alternative way of doing global sum on a single CPU
116 C to eliminate tiling-dependent roundoff errors.
117 C Note: This is slow.
118 #undef CG2D_SINGLECPU_SUM
119
120 C=== Other options (to add/remove pieces of code) ===
121 C-- Flag to turn on checking for errors from all threads and procs
122 C (calling S/R STOP_IF_ERROR) before stopping.
123 #define USE_ERROR_STOP
124
125 C-- Control use of communication with other component:
126 C allow to import and export from/to Coupler interface.
127 #define COMPONENT_MODULE
128
129 #endif /* _CPP_EEOPTIONS_H_ */
130
131 #include "CPP_EEMACROS.h"
132

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