/[MITgcm]/MITgcm/eesupp/src/gsum.F
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Contents of /MITgcm/eesupp/src/gsum.F

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Revision 1.6 - (show annotations) (download)
Fri Sep 21 03:54:35 2001 UTC (24 years, 1 month ago) by cnh
Branch: MAIN
CVS Tags: checkpoint46n_post, checkpoint51k_post, checkpoint47e_post, checkpoint52l_pre, checkpoint44e_post, hrcube4, hrcube5, checkpoint46l_post, checkpoint46g_pre, checkpoint47c_post, release1_p13_pre, checkpoint50c_post, checkpoint46f_post, checkpoint52d_pre, checkpoint48e_post, checkpoint50c_pre, checkpoint44f_post, checkpoint46b_post, checkpoint52j_pre, checkpoint43a-release1mods, checkpoint51o_pre, ecco_c50_e32, ecco_c50_e33, ecco_c50_e30, ecco_c50_e31, release1_p13, checkpoint51l_post, checkpoint48i_post, checkpoint46l_pre, checkpoint52l_post, checkpoint52k_post, chkpt44d_post, checkpoint51, checkpoint50, checkpoint52, release1_p8, release1_p9, checkpoint50d_post, release1_p1, release1_p2, release1_p3, release1_p4, release1_p5, release1_p6, release1_p7, checkpoint52f_post, checkpoint50b_pre, checkpoint44e_pre, checkpoint51f_post, release1_b1, ecco_c51_e34d, ecco_c51_e34e, ecco_c51_e34f, ecco_c51_e34g, ecco_c51_e34a, ecco_c51_e34b, ecco_c51_e34c, checkpoint48b_post, checkpoint43, checkpoint51d_post, checkpoint48c_pre, checkpoint47d_pre, checkpoint51t_post, checkpoint51n_post, release1_chkpt44d_post, checkpoint52i_pre, hrcube_1, hrcube_2, hrcube_3, checkpoint51s_post, checkpoint47a_post, checkpoint48d_pre, checkpoint51j_post, checkpoint47i_post, checkpoint52e_pre, release1_p11, checkpoint52e_post, checkpoint51n_pre, checkpoint47d_post, icebear5, icebear4, icebear3, icebear2, checkpoint46d_pre, checkpoint48d_post, release1-branch_tutorials, checkpoint48f_post, checkpoint45d_post, checkpoint52b_pre, checkpoint46j_pre, checkpoint51l_pre, chkpt44a_post, checkpoint44h_pre, checkpoint48h_post, checkpoint51q_post, ecco_c50_e29, checkpoint51b_pre, checkpoint46a_post, checkpoint47g_post, checkpoint52b_post, checkpoint52c_post, checkpoint46j_post, checkpoint51h_pre, checkpoint46k_post, ecco_c50_e28, chkpt44c_pre, checkpoint48a_post, checkpoint45a_post, checkpoint50f_post, checkpoint50a_post, checkpoint50f_pre, checkpoint52f_pre, ecco_c44_e19, ecco_c44_e18, ecco_c44_e17, ecco_c44_e16, release1_p12, release1_p10, release1_p16, release1_p17, release1_p14, release1_p15, checkpoint47j_post, ecco_c50_e33a, branch-exfmods-tag, checkpoint44g_post, branchpoint-genmake2, checkpoint46e_pre, checkpoint51r_post, checkpoint48c_post, checkpoint45b_post, checkpoint46b_pre, checkpoint51i_post, release1-branch-end, release1_final_v1, checkpoint51b_post, checkpoint51c_post, checkpoint46c_pre, checkpoint46, checkpoint47b_post, checkpoint44b_post, ecco_c51_e34, checkpoint46h_pre, checkpoint52d_post, checkpoint46m_post, checkpoint46a_pre, checkpoint50g_post, checkpoint45c_post, ecco_ice2, ecco_ice1, checkpoint44h_post, checkpoint46g_post, release1_p12_pre, checkpoint52a_pre, ecco_c44_e22, checkpoint50h_post, checkpoint52i_post, checkpoint50e_pre, checkpoint50i_post, ecco_c44_e25, checkpoint51i_pre, checkpoint52h_pre, checkpoint52j_post, checkpoint47f_post, checkpoint50e_post, chkpt44a_pre, checkpoint46i_post, ecco_c44_e23, ecco_c44_e20, ecco_c44_e21, ecco_c44_e26, ecco_c44_e27, ecco_c44_e24, checkpoint46c_post, ecco-branch-mod1, ecco-branch-mod2, ecco-branch-mod3, ecco-branch-mod4, ecco-branch-mod5, branch-netcdf, checkpoint50d_pre, checkpoint46e_post, release1_beta1, checkpoint51e_post, checkpoint44b_pre, checkpoint42, checkpoint41, checkpoint47, checkpoint44, checkpoint45, checkpoint48, checkpoint49, checkpoint46h_post, checkpoint51o_post, checkpoint51f_pre, chkpt44c_post, checkpoint48g_post, checkpoint47h_post, checkpoint52a_post, checkpoint44f_pre, checkpoint51g_post, ecco_c52_e35, checkpoint46d_post, checkpoint50b_post, release1-branch_branchpoint, checkpoint51m_post, checkpoint51a_post, checkpoint51p_post, checkpoint51u_post
Branch point for: c24_e25_ice, branch-exfmods-curt, release1_final, release1-branch, branch-genmake2, release1, branch-nonh, tg2-branch, ecco-branch, release1_50yr, netcdf-sm0, icebear, checkpoint51n_branch, release1_coupled
Changes since 1.5: +59 -12 lines 
Starting to bring comments up to date and format comments
for document extraction of "prototypes".
1 C $Header: /u/gcmpack/models/MITgcmUV/eesupp/src/gsum.F,v 1.5 2001/02/04 14:38:43 cnh Exp $
2 C $Name: $
3 #include "CPP_EEOPTIONS.h"
4
5 CBOP
6
7 C !ROUTINE: GSUM_R8_INIT
8
9 C !INTERFACE:
10 SUBROUTINE GSUM_R8_INIT( myThid )
11 IMPLICIT NONE
12
13 C !DESCRIPTION:
14 C *=============================================================================*
15 C | SUBROUTINE GSUM_R8_INIT
16 C | o Setup data structures for global sum.
17 C *=============================================================================*
18 C | Fast true shared memory form for global sum operation.
19 C *=============================================================================*
20
21 C !USES:
22 #include "SIZE.h"
23 #include "EEPARAMS.h"
24 #include "EESUPPORT.h"
25 C GSR8_value :: Global data for accumulating sum elements.
26 C GSR8_level :: Cyclic buffer index into global data sum elements.
27 COMMON /GS_R8_BUFFER_R/
28 & GSR8_value
29 Real*8 GSR8_value(lShare8,MAX_NO_THREADS)
30 #define _NOT_SET_ 1.23456D12
31 COMMON /GS_R8_BUFFER_I/
32 & GSR8_level
33 INTEGER GSR8_level
34
35 C !INPUT PARAMETERS:
36 C myThid :: Thread number of this instance.
37 INTEGER myThid
38
39 C !LOCAL VARIABLES:
40 C I :: Loop counter.
41 INTEGER I
42 CEOP
43 GSR8_level = 1
44 DO I = 1, lShare8
45 GSR8_value(I,myThid) = _NOT_SET_
46 ENDDO
47 C
48 RETURN
49 END
50
51 CBOP
52 C !ROUTINE: GSUM_R8
53
54 C !INTERFACE:
55 SUBROUTINE GSUM_R8( myPhi, answer, myThid )
56 IMPLICIT NONE
57 C !DESCRIPTION:
58 C *=============================================================================*
59 C | SUBROUTINE GSUM_R8
60 C | o Perform global sum.
61 C *=============================================================================*
62 C | Fast true shared memory form for global sum operation.
63 C *=============================================================================*
64 C !USES:
65 #include "SIZE.h"
66 #include "EEPARAMS.h"
67 #include "EESUPPORT.h"
68 C GSR8_value :: Global data for accumulating sum elements.
69 C GSR8_level :: Cyclic buffer index into global data sum elements.
70 COMMON /GS_R8_BUFFER_R/
71 & GSR8_value
72 Real*8 GSR8_value(lShare8,MAX_NO_THREADS)
73 #define _NOT_SET_ 1.23456D12
74 COMMON /GS_R8_BUFFER_I/
75 & GSR8_level
76 INTEGER GSR8_level
77 C
78
79 C !INPUT/OUTPUT PARAMETERS:
80 C myPhi :: This threads contribution
81 C answer :: Result of sum over all threads
82 C myThid :: This threads id number
83 Real*8 myPhi
84 Real*8 answer
85 INTEGER myThid
86 #ifdef ALLOW_USE_MPI
87 Real*8 tmp, sumPhi
88 INTEGER mpiRc
89 #endif
90 C
91 C !LOCAL VARIABLES:
92 C nDone :: Counter for number of threads completed.
93 C I :: Loop counter.
94 C curLev :: Cyclic global sum buffer levels.
95 C prevLev
96 INTEGER nDone
97 INTEGER I
98 INTEGER curLev, prevLev
99 C
100 CEOP
101
102 C answer = 1.
103 C CALL BAR2(myThid)
104 C CALL BAR2(myThid)
105 C CALL BAR2(myThid)
106 C RETURN
107 C
108 IF ( myThid .NE. 1 ) THEN
109
110 curLev = GSR8_level
111 GSR8_value(curLev,myThid) = myPhi
112 10 CONTINUE
113 IF ( GSR8_value(curLev,1) .NE. _NOT_SET_ ) GOTO 11
114 CALL FOOL_THE_COMPILER( GSR8_value )
115 GOTO 10
116 11 CONTINUE
117 GSR8_value(curLev,myThid) = _NOT_SET_
118 answer = GSR8_value(curLev,1)
119
120 ELSE
121
122 curLev = GSR8_level
123 prevLev = curLev+1
124 IF ( prevLev .GT. 2 ) prevLev = 1
125
126 12 CONTINUE
127 CALL FOOL_THE_COMPILER( GSR8_value )
128 nDone = 1
129 DO I = 2, nThreads
130 IF ( GSR8_value(curLev,I) .NE. _NOT_SET_ ) nDone = nDone+1
131 ENDDO
132 IF ( nDone .LT. nThreads ) GOTO 12
133
134 GSR8_level = prevLev
135 CALL FOOL_THE_COMPILER( GSR8_value )
136 GSR8_value(prevLev,1) = _NOT_SET_
137
138 answer = myPhi
139 DO I = 2,nThreads
140 answer = answer+GSR8_value(curLev,I)
141 ENDDO
142
143 #ifdef ALLOW_USE_MPI
144 #ifndef ALWAYS_USE_MPI
145 IF ( usingMPI ) THEN
146 #endif
147 tmp = answer
148 CALL MPI_Allreduce(tmp,sumPhi,1,MPI_DOUBLE_PRECISION,MPI_SUM,
149 & MPI_COMM_MODEL,mpiRC)
150 answer = sumPhi
151 #ifndef ALWAYS_USE_MPI
152 ENDIF
153 #endif
154 #endif /* ALLOW_USE_MPI */
155
156 GSR8_value(curLev,1) = answer
157
158 ENDIF
159 C
160 RETURN
161 END
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