/[MITgcm]/MITgcm/verification/lab_sea/code_ad/CPP_EEOPTIONS.h
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Revision 1.2 - (hide annotations) (download)
Thu Sep 6 23:04:31 2012 UTC (11 years, 8 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, checkpoint64, checkpoint65, checkpoint65j, checkpoint65k, checkpoint65h, checkpoint65i, checkpoint65n, checkpoint65l, checkpoint65m, checkpoint65b, checkpoint65c, checkpoint65a, checkpoint65f, checkpoint65g, checkpoint65d, checkpoint65e
Changes since 1.1: +7 -20 lines
File MIME type: text/plain
- up-to-date with standard version (in eesupp/inc)
- also turn on GLOBAL_SUM_SEND_RECV (had already CG2D_SINGLECPU_SUM defined)

1 jmc 1.2 C $Header: /u/gcmpack/MITgcm/verification/tutorial_plume_on_slope/code/CPP_EEOPTIONS.h_mpi,v 1.2 2010/03/04 22:33:56 jmc Exp $
2 heimbach 1.1 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 jmc 1.2 C-- disconnect tiles (no exchange between tiles, just fill-in edges
112     C assuming locally periodic subdomain)
113     #undef DISCONNECTED_TILES
114    
115 heimbach 1.1 C-- Alternative way of doing global sum without MPI allreduce call
116     C but instead, explicit MPI send & recv calls.
117 jmc 1.2 #define GLOBAL_SUM_SEND_RECV
118 heimbach 1.1
119     C-- Alternative way of doing global sum on a single CPU
120     C to eliminate tiling-dependent roundoff errors.
121     C Note: This is slow.
122 jmc 1.2 #define CG2D_SINGLECPU_SUM
123 heimbach 1.1
124     C=== Other options (to add/remove pieces of code) ===
125     C-- Flag to turn on checking for errors from all threads and procs
126     C (calling S/R STOP_IF_ERROR) before stopping.
127     #define USE_ERROR_STOP
128    
129     C-- Control use of communication with other component:
130     C allow to import and export from/to Coupler interface.
131     #undef COMPONENT_MODULE
132    
133     #endif /* _CPP_EEOPTIONS_H_ */
134    
135     #include "CPP_EEMACROS.h"
136    

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