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MITgcm/MITgcm/verification/global_ocean.90x40x15/code_ad/CPP_EEOPTIONS.h_mpi
4a42183a09 Jean*0001 CBOP
0002 C !ROUTINE: CPP_EEOPTIONS.h
0003 C !INTERFACE:
0004 C include "CPP_EEOPTIONS.h"
0005 C
0006 C !DESCRIPTION:
0007 C *==========================================================*
0008 C | CPP\_EEOPTIONS.h |
0009 C *==========================================================*
0010 C | C preprocessor "execution environment" supporting |
0011 C | flags. Use this file to set flags controlling the |
0012 C | execution environment in which a model runs - as opposed |
0013 C | to the dynamical problem the model solves. |
0014 C | Note: Many options are implemented with both compile time|
0015 C | and run-time switches. This allows options to be |
0016 C | removed altogether, made optional at run-time or |
0017 C | to be permanently enabled. This convention helps |
0018 C | with the data-dependence analysis performed by the |
0019 C | adjoint model compiler. This data dependency |
0020 C | analysis can be upset by runtime switches that it |
0021 C | is unable to recoginise as being fixed for the |
0022 C | duration of an integration. |
0023 C | A reasonable way to use these flags is to |
0024 C | set all options as selectable at runtime but then |
0025 C | once an experimental configuration has been |
0026 C | identified, rebuild the code with the appropriate |
0027 C | options set at compile time. |
0028 C *==========================================================*
0029 CEOP
00300031 #ifndef _CPP_EEOPTIONS_H_
0032 #define _CPP_EEOPTIONS_H_
00330034 C In general the following convention applies:
0035 C ALLOW - indicates an feature will be included but it may
0036 C CAN have a run-time flag to allow it to be switched
0037 C on and off.
0038 C If ALLOW or CAN directives are "undef'd" this generally
0039 C means that the feature will not be available i.e. it
0040 C will not be included in the compiled code and so no
0041 C run-time option to use the feature will be available.
0042 C
0043 C ALWAYS - indicates the choice will be fixed at compile time
0044 C so no run-time option will be present
00450046 C=== Macro related options ===
0047 C-- Control storage of floating point operands
0048 C On many systems it improves performance only to use
0049 C 8-byte precision for time stepped variables.
0050 C Constant in time terms ( geometric factors etc.. )
0051 C can use 4-byte precision, reducing memory utilisation and
0052 C boosting performance because of a smaller working set size.
0053 C However, on vector CRAY systems this degrades performance.
0054 C Enable to switch REAL4_IS_SLOW from genmake2 (with LET_RS_BE_REAL4):
0055 #ifdef LET_RS_BE_REAL4
0056 #undef REAL4_IS_SLOW
0057 #else /* LET_RS_BE_REAL4 */
0058 #define REAL4_IS_SLOW
0059 #endif /* LET_RS_BE_REAL4 */
00600061 C-- Control use of "double" precision constants.
0062 C Use D0 where it means REAL*8 but not where it means REAL*16
0063 #define D0 d0
00640065 C=== IO related options ===
0066 C-- Flag used to indicate whether Fortran formatted write
0067 C and read are threadsafe. On SGI the routines can be thread
0068 C safe, on Sun it is not possible - if you are unsure then
0069 C undef this option.
0070 #undef FMTFTN_IO_THREAD_SAFE
00710072 C-- Flag used to indicate whether Binary write to Local file (i.e.,
0073 C a different file for each tile) and read are thread-safe.
0074 #undef LOCBIN_IO_THREAD_SAFE
00750076 C-- Flag to turn off the writing of error message to ioUnit zero
0077 #undef DISABLE_WRITE_TO_UNIT_ZERO
00780079 C-- Alternative formulation of BYTESWAP, faster than
0080 C compiler flag -byteswapio on the Altix.
0081 #undef FAST_BYTESWAP
00823310c7d649 Jean*0083 C-- Flag defined for eeboot_minimal.F, eeset_parms.F and open_copy_data_file.F
0084 C to write STDOUT, STDERR and scratch files from process 0 only.
0085 C WARNING: to use only when absolutely confident that the setup is working
0086 C since any message (error/warning/print) from any proc <> 0 will be lost.
0087 #undef SINGLE_DISK_IO
00884a42183a09 Jean*0089 C=== MPI, EXCH and GLOBAL_SUM related options ===
0090 C-- Flag turns off MPI_SEND ready_to_receive polling in the
0091 C gather_* subroutines to speed up integrations.
0092 #undef DISABLE_MPI_READY_TO_RECEIVE
00930094 C-- Control use of communication that might overlap computation.
0095 C Under MPI selects/deselects "non-blocking" sends and receives.
0096 #define ALLOW_ASYNC_COMMUNICATION
0097 #undef ALLOW_ASYNC_COMMUNICATION
0098 #undef ALWAYS_USE_ASYNC_COMMUNICATION
0099 C-- Control use of communication that is atomic to computation.
0100 C Under MPI selects/deselects "blocking" sends and receives.
0101 #define ALLOW_SYNC_COMMUNICATION
0102 #undef ALWAYS_USE_SYNC_COMMUNICATION
01030104 C-- Control XY periodicity in processor to grid mappings
0105 C Note: Model code does not need to know whether a domain is
0106 C periodic because it has overlap regions for every box.
0107 C Model assume that these values have been
0108 C filled in some way.
0109 #undef ALWAYS_PREVENT_X_PERIODICITY
0110 #undef ALWAYS_PREVENT_Y_PERIODICITY
0111 #define CAN_PREVENT_X_PERIODICITY
0112 #define CAN_PREVENT_Y_PERIODICITY
01133310c7d649 Jean*0114 C-- disconnect tiles (no exchange between tiles, just fill-in edges
0115 C assuming locally periodic subdomain)
0116 #undef DISCONNECTED_TILES
01170118 C-- Always cumulate tile local-sum in the same order by applying MPI allreduce
0119 C to array of tiles ; can get slower with large number of tiles (big set-up)
0120 #undef GLOBAL_SUM_ORDER_TILES
01214a42183a09 Jean*0122 C-- Alternative way of doing global sum without MPI allreduce call
3310c7d649 Jean*0123 C but instead, explicit MPI send & recv calls. Expected to be slower.
4a42183a09 Jean*0124 #define GLOBAL_SUM_SEND_RECV
01250126 C-- Alternative way of doing global sum on a single CPU
3310c7d649 Jean*0127 C to eliminate tiling-dependent roundoff errors. Note: This is slow.
4a42183a09 Jean*0128 #undef CG2D_SINGLECPU_SUM
01290130 C=== Other options (to add/remove pieces of code) ===
0131 C-- Flag to turn on checking for errors from all threads and procs
0132 C (calling S/R STOP_IF_ERROR) before stopping.
0133 #define USE_ERROR_STOP
01340135 C-- Control use of communication with other component:
0136 C allow to import and export from/to Coupler interface.
0137 #undef COMPONENT_MODULE
01380139 #endif /* _CPP_EEOPTIONS_H_ */
01400141 #include "CPP_EEMACROS.h"
0142
