/[MITgcm]/MITgcm/verification/cpl_atm2d+ocn/code_ocn/CPP_EEOPTIONS.h
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Contents of /MITgcm/verification/cpl_atm2d+ocn/code_ocn/CPP_EEOPTIONS.h

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Revision 1.2 - (show annotations) (download)
Thu Sep 3 20:18:50 2009 UTC (12 years, 8 months ago) by jscott
Branch: MAIN
CVS Tags: checkpoint62, checkpoint62c, checkpoint62b, checkpoint62a, checkpoint61v, checkpoint61w, checkpoint61z, checkpoint61x, checkpoint61y
Changes since 1.1: +15 -1 lines
File MIME type: text/plain
update cpl_atm2d+ocn verification exp

1 C $Header: /u/gcmpack/MITgcm/eesupp/inc/CPP_EEOPTIONS.h,v 1.31 2009/04/26 02:34:40 jmc 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_THREAD_SAFE
54
55 C-- Flag used to indicate whether Binary write to Local file (i.e.,
56 C a different file for each tile) and read are thread-safe.
57 #undef LOCBIN_IO_THREAD_SAFE
58
59 C-- Flag to turn off the writing of error message to ioUnit zero
60 #undef DISABLE_WRITE_TO_UNIT_ZERO
61
62 C-- Flag to turn on checking for errors from all threads and procs
63 C (calling S/R STOP_IF_ERROR) before stopping.
64 #define USE_ERROR_STOP
65
66 C-- Flag turns off MPI_SEND ready_to_receive polling in the
67 C gather_* subroutines to speed up integrations.
68 #undef DISABLE_MPI_READY_TO_RECEIVE
69
70 C-- Control MPI based parallel processing
71 CXXX We no longer select the use of MPI via this file (CPP_EEOPTIONS.h)
72 CXXX To use MPI, use an appropriate genmake2 options file or use
73 CXXX genmake2 -mpi .
74 CXXX #undef ALLOW_USE_MPI
75 CXXX #undef ALWAYS_USE_MPI
76
77 C-- Control use of communication that might overlap computation.
78 C Under MPI selects/deselects "non-blocking" sends and receives.
79 #define ALLOW_ASYNC_COMMUNICATION
80 #undef ALLOW_ASYNC_COMMUNICATION
81 #undef ALWAYS_USE_ASYNC_COMMUNICATION
82 C-- Control use of communication that is atomic to computation.
83 C Under MPI selects/deselects "blocking" sends and receives.
84 #define ALLOW_SYNC_COMMUNICATION
85 #undef ALWAYS_USE_SYNC_COMMUNICATION
86
87 C-- Control use of communication with other component:
88 C allow to import and export from/to Coupler interface.
89 #define COMPONENT_MODULE
90
91
92 C-- Control use of JAM routines for Artic network
93 C These invoke optimized versions of "exchange" and "sum" that
94 C utilize the programmable aspect of Artic cards.
95 #undef LETS_MAKE_JAM
96 #undef JAM_WITH_TWO_PROCS_PER_NODE
97
98 C-- Control storage of floating point operands
99 C On many systems it improves performance only to use
100 C 8-byte precision for time stepped variables.
101 C Constant in time terms ( geometric factors etc.. )
102 C can use 4-byte precision, reducing memory utilisation and
103 C boosting performance because of a smaller working
104 C set size. However, on vector CRAY systems this degrades
105 C performance.
106 #define REAL4_IS_SLOW
107
108 C-- Control use of "double" precision constants.
109 C Use D0 where it means REAL*8 but not where it means REAL*16
110 #define D0 d0
111
112 C-- Control XY periodicity in processor to grid mappings
113 C Note: Model code does not need to know whether a domain is
114 C periodic because it has overlap regions for every box.
115 C Model assume that these values have been
116 C filled in some way.
117 #undef ALWAYS_PREVENT_X_PERIODICITY
118 #undef ALWAYS_PREVENT_Y_PERIODICITY
119 #define CAN_PREVENT_X_PERIODICITY
120 #define CAN_PREVENT_Y_PERIODICITY
121
122 C-- Alternative formulation of BYTESWAP, faster than
123 C compiler flag -byteswapio on the Altix.
124 #undef FAST_BYTESWAP
125
126 C-- Alternative way of doing global sum without MPI allreduce call
127 C but instead, explicit MPI send & recv calls.
128 #undef GLOBAL_SUM_SEND_RECV
129
130 C-- Alternative way of doing global sum on a single CPU
131 C to eliminate tiling-dependent roundoff errors.
132 C Note: This is slow.
133 #undef CG2D_SINGLECPU_SUM
134
135 #endif /* _CPP_EEOPTIONS_H_ */
136
137 #include "CPP_EEMACROS.h"
138

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