exp4/code/CPP_EEOPTIONS.h_mpi

C $Header: /u/gcmpack/MITgcm/eesupp/inc/CPP_EEOPTIONS.h,v 1.32 2009/05/25 04:33:15 heimbach Exp $
C $Name:  $

CBOP
C     !ROUTINE: CPP_EEOPTIONS.h
C     !INTERFACE:
C     include "CPP_EEOPTIONS.h"
C
C     !DESCRIPTION:
C     *==========================================================*
C     | CPP\_EEOPTIONS.h                                         |
C     *==========================================================*
C     | C preprocessor "execution environment" supporting        |
C     | flags. Use this file to set flags controlling the        |
C     | execution environment in which a model runs - as opposed |
C     | to the dynamical problem the model solves.               |
C     | Note: Many options are implemented with both compile time|
C     |       and run-time switches. This allows options to be   |
C     |       removed altogether, made optional at run-time or   |
C     |       to be permanently enabled. This convention helps   |
C     |       with the data-dependence analysis performed by the |
C     |       adjoint model compiler. This data dependency       |
C     |       analysis can be upset by runtime switches that it  |
C     |       is unable to recoginise as being fixed for the     |
C     |       duration of an integration.                        |
C     |       A reasonable way to use these flags is to          |
C     |       set all options as selectable at runtime but then  |
C     |       once an experimental configuration has been        |
C     |       identified, rebuild the code with the appropriate  |
C     |       options set at compile time.                       |
C     *==========================================================*
CEOP

#ifndef _CPP_EEOPTIONS_H_
#define _CPP_EEOPTIONS_H_

C     In general the following convention applies:
C     ALLOW  - indicates an feature will be included but it may
C     CAN      have a run-time flag to allow it to be switched
C              on and off.
C              If ALLOW or CAN directives are "undef'd" this generally
C              means that the feature will not be available i.e. it
C              will not be included in the compiled code and so no
C              run-time option to use the feature will be available.
C
C     ALWAYS - indicates the choice will be fixed at compile time
C              so no run-time option will be present

C=== Macro related options ===
C--   Control storage of floating point operands
C     On many systems it improves performance only to use
C     8-byte precision for time stepped variables.
C     Constant in time terms ( geometric factors etc.. )
C     can use 4-byte precision, reducing memory utilisation and
C     boosting performance because of a smaller working set size.
C     However, on vector CRAY systems this degrades performance.
C     Enable to switch REAL4_IS_SLOW from genmake2 (with LET_RS_BE_REAL4):
#ifdef LET_RS_BE_REAL4
#undef REAL4_IS_SLOW
#else /* LET_RS_BE_REAL4 */
#define REAL4_IS_SLOW
#endif /* LET_RS_BE_REAL4 */

C--   Control use of "double" precision constants.
C     Use D0 where it means REAL*8 but not where it means REAL*16
#define D0 d0

C=== IO related options ===
C--   Flag used to indicate whether Fortran formatted write
C     and read are threadsafe. On SGI the routines can be thread
C     safe, on Sun it is not possible - if you are unsure then
C     undef this option.
#undef FMTFTN_IO_THREAD_SAFE

C--   Flag used to indicate whether Binary write to Local file (i.e.,
C     a different file for each tile) and read are thread-safe.
#undef LOCBIN_IO_THREAD_SAFE

C--   Flag to turn off the writing of error message to ioUnit zero
#undef DISABLE_WRITE_TO_UNIT_ZERO

C--   Alternative formulation of BYTESWAP, faster than
C     compiler flag -byteswapio on the Altix.
#undef FAST_BYTESWAP

C=== MPI, EXCH and GLOBAL_SUM related options ===
C--   Flag turns off MPI_SEND ready_to_receive polling in the
C     gather_* subroutines to speed up integrations.
#undef DISABLE_MPI_READY_TO_RECEIVE

C--   Control use of communication that might overlap computation.
C     Under MPI selects/deselects "non-blocking" sends and receives.
#define ALLOW_ASYNC_COMMUNICATION
#undef  ALLOW_ASYNC_COMMUNICATION
#undef  ALWAYS_USE_ASYNC_COMMUNICATION
C--   Control use of communication that is atomic to computation.
C     Under MPI selects/deselects "blocking" sends and receives.
#define ALLOW_SYNC_COMMUNICATION
#undef  ALWAYS_USE_SYNC_COMMUNICATION

C--   Control XY periodicity in processor to grid mappings
C     Note: Model code does not need to know whether a domain is
C           periodic because it has overlap regions for every box.
C           Model assume that these values have been
C           filled in some way.
#undef  ALWAYS_PREVENT_X_PERIODICITY
#undef  ALWAYS_PREVENT_Y_PERIODICITY
#define CAN_PREVENT_X_PERIODICITY
#define CAN_PREVENT_Y_PERIODICITY

C--   Alternative way of doing global sum without MPI allreduce call
C     but instead, explicit MPI send & recv calls.
#define GLOBAL_SUM_SEND_RECV

C--   Alternative way of doing global sum on a single CPU
C     to eliminate tiling-dependent roundoff errors.
C     Note: This is slow.
#undef  CG2D_SINGLECPU_SUM

C=== Other options (to add/remove pieces of code) ===
C--   Flag to turn on checking for errors from all threads and procs
C     (calling S/R STOP_IF_ERROR) before stopping.
#define USE_ERROR_STOP

C--   Control use of communication with other component:
C     allow to import and export from/to Coupler interface.
#undef COMPONENT_MODULE

#endif /* _CPP_EEOPTIONS_H_ */

#include "CPP_EEMACROS.h"

1	jmc	1.4	C $Header: /u/gcmpack/MITgcm/eesupp/inc/CPP_EEOPTIONS.h,v 1.32 2009/05/25 04:33:15 heimbach Exp $
2	edhill	1.1	C $Name: $
3	jmc	1.3
4			CBOP
5			C !ROUTINE: CPP_EEOPTIONS.h
6			C !INTERFACE:
7			C include "CPP_EEOPTIONS.h"
8	edhill	1.1	C
9	jmc	1.3	C !DESCRIPTION:
10			C ==========================================================
11			C \| CPP\_EEOPTIONS.h \|
12			C ==========================================================
13	edhill	1.1	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	jmc	1.3	C ==========================================================
32			CEOP
33	edhill	1.1
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	jmc	1.4	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 REAL8 but not where it means REAL16
66			#define D0 d0
67
68			C=== IO related options ===
69	jmc	1.3	C-- Flag used to indicate whether Fortran formatted write
70	edhill	1.1	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	jmc	1.3	#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	jmc	1.4	C-- Alternative formulation of BYTESWAP, faster than
83			C compiler flag -byteswapio on the Altix.
84			#undef FAST_BYTESWAP
85	jmc	1.3
86	jmc	1.4	C=== MPI, EXCH and GLOBAL_SUM related options ===
87	jmc	1.3	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	edhill	1.1
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	jmc	1.3	C Note: Model code does not need to know whether a domain is
103	edhill	1.1	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	1.3	C-- Alternative way of doing global sum without MPI allreduce call
112			C but instead, explicit MPI send & recv calls.
113			#define 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	jmc	1.4	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			#undef COMPONENT_MODULE
128
129	edhill	1.1	#endif /* _CPP_EEOPTIONS_H_ */
130
131			#include "CPP_EEMACROS.h"
132	jmc	1.3