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adcroft |
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C $Header: /u/gcmpack/models/MITgcmUV/eesupp/inc/CPP_EEOPTIONS.h,v 1.13 2000/03/14 16:16:01 adcroft Exp $ |
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C |
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C /==========================================================\ |
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C | CPP_EEMACROS.h | |
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C |==========================================================| |
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C | C preprocessor "execution environment" supporting | |
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C | macros. Use this file to define macros for simplifying | |
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C | execution environment in which a model runs - as opposed | |
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C | to the dynamical problem the model solves. | |
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C \==========================================================/ |
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#ifndef _CPP_EEMACROS_H_ |
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#define _CPP_EEMACROS_H_ |
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C In general the following convention applies: |
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C ALLOW - indicates an feature will be included but it may |
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C CAN have a run-time flag to allow it to be switched |
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C on and off. |
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C If ALLOW or CAN directives are "undef'd" this generally |
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C means that the feature will not be available i.e. it |
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C will not be included in the compiled code and so no |
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C run-time option to use the feature will be available. |
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C |
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C ALWAYS - indicates the choice will be fixed at compile time |
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C so no run-time option will be present |
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C Flag used to indicate which flavour of multi-threading |
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C compiler directives to use. Only set one of these. |
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C USE_SOLARIS_THREADING - Takes directives for SUN Workshop |
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C compiler. |
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C USE_KAP_THREADING - Takes directives for Kuck and |
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C Associates multi-threading compiler |
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C ( used on Digital platforms ). |
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C USE_IRIX_THREADING - Takes directives for SGI MIPS |
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C Pro Fortran compiler. |
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C USE_EXEMPLAR_THREADING - Takes directives for HP SPP series |
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C compiler. |
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C USE_C90_THREADING - Takes directives for CRAY/SGI C90 |
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C system F90 compiler. |
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#ifdef TARGET_SUN |
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#define USE_SOLARIS_THREADING |
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#endif |
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#ifdef TARGET_DEC |
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#define USE_KAP_THREADING |
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#endif |
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#ifdef TARGET_SGI |
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#define USE_IRIX_THREADING |
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#endif |
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#ifdef TARGET_HP |
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#define USE_EXEMPLAR_THREADING |
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#endif |
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#ifdef TARGET_CRAY_VECTOR |
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#define USE_C90_THREADING |
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#endif |
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C-- Define the mapping for the _BARRIER macro |
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C On some systems low-level hardware support can be accessed through |
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C compiler directives here. |
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#define _BARRIER CALL BARRIER(myThid) |
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C-- Define the mapping for the BEGIN_CRIT() and END_CRIT() macros. |
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C On some systems we simply execute this section only using the |
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C master thread i.e. its not really a critical section. We can |
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C do this because we do not use critical sections in any critical |
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C sections of our code! |
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#define _BEGIN_CRIT(a) _BEGIN_MASTER(a) |
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#define _END_CRIT(a) _END_MASTER(a) |
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C-- Define the mapping for the BEGIN_MASTER_SECTION() and |
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C END_MASTER_SECTION() macros. These are generally implemented by |
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C simply choosing a particular thread to be "the master" and have |
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C it alone execute the BEGIN_MASTER..., END_MASTER.. sections. |
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#define _BEGIN_MASTER(a) IF ( a .EQ. 1 ) THEN |
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#define _END_MASTER(a) ENDIF |
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C-- Control use of JAM routines for Artic network |
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C These invoke optimized versions of "exchange" and "sum" that |
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C utilize the programmable aspect of Artic cards. |
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#ifdef LETS_MAKE_JAM |
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#define _JAMEXT _jam |
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#else |
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#define _JAMEXT |
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#endif |
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C-- Control storage of floating point operands |
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C On many systems it improves performance only to use |
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C 8-byte precision for time stepped variables. |
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C Constant in time terms ( geometric factors etc.. ) |
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C can use 4-byte precision, reducing memory utilisation and |
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C boosting performance because of a smaller working |
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C set size. However, on vector CRAY systems this degrades |
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C performance. |
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#ifdef REAL4_IS_SLOW |
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#define _RS Real*8 |
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#define RS_IS_REAL8 |
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#define _EXCH_XY_R4(a,b) CALL EXCH_XY_R8 _JAMEXT ( a, b ) |
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#define _EXCH_XYZ_R4(a,b) CALL EXCH_XYZ_R8 _JAMEXT ( a, b ) |
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#define _GLOBAL_SUM_R4(a,b) CALL GLOBAL_SUM_R8 _JAMEXT ( a, b) |
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#define _GLOBAL_MAX_R4(a,b) CALL GLOBAL_MAX_R8 ( a, b ) |
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#else |
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#define _RS Real*4 |
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#define RS_IS_REAL4 |
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#define _EXCH_XY_R4(a,b) CALL EXCH_XY_R4 ( a, b ) |
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#define _EXCH_XYZ_R4(a,b) CALL EXCH_XYZ_R4 ( a, b ) |
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#define _GLOBAL_SUM_R4(a,b) CALL GLOBAL_SUM_R4 ( a, b ) |
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#define _GLOBAL_MAX_R4(a,b) CALL GLOBAL_MAX_R4 ( a, b ) |
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#endif |
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#define _RL Real*8 |
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#define _EXCH_XY_R8(a,b) CALL EXCH_XY_R8 _JAMEXT ( a, b ) |
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#define _EXCH_XYZ_R8(a,b) CALL EXCH_XYZ_R8 _JAMEXT ( a, b ) |
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#define _GLOBAL_SUM_R8(a,b) CALL GLOBAL_SUM_R8 _JAMEXT ( a, b ) |
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#define _GLOBAL_MAX_R8(a,b) CALL GLOBAL_MAX_R8 ( a, b ) |
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C-- Control use of "double" precision constants. |
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C Use D0 where it means REAL*8 but not where it means REAL*16 |
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#ifdef REAL_D0_IS_16BYTES |
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#define D0 |
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#endif |
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C-- Substitue for 1.D variables |
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C Sun compilers do not use 8-byte precision for literals |
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C unless .Dnn is specified. CRAY vector machines use 16-byte |
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C precision when they see .Dnn which runs very slowly! |
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#ifdef REAL_D0_IS_16BYTES |
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#define _d |
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#define _F64( a ) a |
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#endif |
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#ifndef REAL_D0_IS_16BYTES |
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#define _d D |
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#define _F64( a ) DFLOAT( a ) |
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#endif |
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#endif /* _CPP_EEMACROS_H_ */ |
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