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

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Revision 1.4 - (show annotations) (download)
Fri Sep 21 03:54:35 2001 UTC (22 years, 7 months 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, checkpoint50g_post, checkpoint46b_post, checkpoint52j_pre, checkpoint43a-release1mods, checkpoint51o_pre, checkpoint44g_post, checkpoint48c_post, ecco_c50_e32, ecco_c50_e33, ecco_c50_e30, ecco_c50_e31, release1_p13, checkpoint51l_post, checkpoint48i_post, checkpoint46l_pre, checkpoint50d_pre, checkpoint52k_post, chkpt44d_post, checkpoint51, 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, checkpoint48b_post, ecco_c51_e34d, ecco_c51_e34e, ecco_c51_e34f, ecco_c51_e34g, ecco_c51_e34a, ecco_c51_e34b, ecco_c51_e34c, checkpoint43, checkpoint51d_post, checkpoint48c_pre, checkpoint51t_post, checkpoint51n_post, release1_chkpt44d_post, checkpoint52i_pre, hrcube_2, hrcube_3, checkpoint51s_post, checkpoint48d_pre, checkpoint51j_post, checkpoint47i_post, checkpoint52e_pre, 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, ecco_c50_e28, checkpoint51l_pre, checkpoint47d_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, checkpoint46b_pre, chkpt44c_pre, checkpoint52h_pre, checkpoint45a_post, checkpoint50f_post, checkpoint50a_post, checkpoint50f_pre, hrcube_1, checkpoint51m_post, ecco_c44_e19, ecco_c44_e18, ecco_c44_e17, ecco_c44_e16, release1_p12, release1_p10, release1_p11, release1_p16, release1_p17, release1_p14, release1_p15, checkpoint47a_post, ecco_c50_e33a, branchpoint-genmake2, checkpoint46e_pre, checkpoint51r_post, checkpoint45b_post, checkpoint51i_post, release1-branch-end, release1_final_v1, checkpoint51b_post, release1_p12_pre, checkpoint46c_pre, checkpoint44f_post, checkpoint47b_post, checkpoint44b_post, ecco_c51_e34, checkpoint46h_pre, checkpoint52d_post, checkpoint46m_post, checkpoint46a_pre, checkpoint50c_pre, checkpoint45c_post, ecco_ice2, ecco_ice1, checkpoint44h_post, checkpoint46g_post, checkpoint51c_post, checkpoint52a_pre, checkpoint46i_post, checkpoint50h_post, checkpoint52i_post, checkpoint50e_pre, checkpoint50i_post, ecco_c44_e25, checkpoint51i_pre, checkpoint48a_post, checkpoint47j_post, branch-exfmods-tag, checkpoint52j_post, checkpoint47f_post, checkpoint50e_post, chkpt44a_pre, ecco_c44_e22, 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, checkpoint52l_post, checkpoint46e_post, release1_beta1, checkpoint51e_post, checkpoint44b_pre, checkpoint42, checkpoint41, checkpoint46, checkpoint47, checkpoint44, checkpoint45, checkpoint48, checkpoint49, checkpoint46h_post, checkpoint51o_post, checkpoint50, checkpoint51f_pre, chkpt44c_post, checkpoint47h_post, checkpoint52a_post, checkpoint44f_pre, checkpoint51g_post, ecco_c52_e35, checkpoint46d_post, checkpoint50b_post, release1-branch_branchpoint, checkpoint52f_pre, checkpoint51a_post, checkpoint51p_post, checkpoint48g_post, checkpoint51u_post
Branch point for: c24_e25_ice, branch-exfmods-curt, release1_coupled, release1_final, release1-branch, branch-genmake2, release1, branch-nonh, tg2-branch, ecco-branch, release1_50yr, netcdf-sm0, icebear, checkpoint51n_branch
Changes since 1.3: +24 -2 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_jam.F,v 1.3 2001/02/04 14:38:43 cnh Exp $
2 C $Name: $
3
4 #include "CPP_EEOPTIONS.h"
5
6 #undef USE_MPI_GSUM
7 #define USE_JAM_GSUM
8
9 CBOP
10 C !ROUTINE: GLOBAL_SUM_R8_JAM
11
12 C !INTERFACE:
13 SUBROUTINE GLOBAL_SUM_R8_JAM( ans, myThid )
14
15 C !DESCRIPTION:
16 C *=========================================================================*
17 C | SUBROUTINE GLOBAL_SUM_R8_JAM
18 C | o JAM binding of global sum routine
19 C *=========================================================================*
20 C | Does a super fast global sum over the JAM library. With JAM
21 C | timings for dual proc SMP nodes over Arctic are about
22 C | 4.3usecs log2(NP/2). When it was done this was faster than any other
23 C | cluster on the planet :-).
24 C *=========================================================================*
25
26 C !USES:
27 #ifdef ALLOW_MPI
28 #include "mpif.h"
29 #endif
30
31 C !INPUT/OUTPUT PARAMETERS:
32 C ans :: Returned sum value
33 C myThid :: Thread number of this instance
34 Real*8 ans
35 INTEGER myThid
36
37 #ifdef LETS_MAKE_JAM
38
39 C !LOCAL VARIABLES:
40 C phi :: Temp. for accumulating sum
41 C RC :: Return code
42 Real*8 phi
43 INTEGER RC
44
45 phi = ans
46
47 #ifdef USE_MPI_GSUM
48 CALL MPI_Allreduce( phi,
49 & ans,
50 & 1,
51 & MPI_REAL8,
52 & MPI_SUM,
53 & MPI_COMM_WORLD,
54 & rc
55 & )
56 #endif
57
58 #ifdef USE_JAM_GSUM
59 C JAM global sum
60 CALL JAM_barrier_start( phi )
61 CALL JAM_barrier_done( ans )
62 #endif
63
64 C WRITE(6,*) ' phi = ', phi, ' Sum = ', ans
65 C CALL MPI_Finalize( rc )
66 C STOP
67
68 #endif /* LETS_MAKE_JAM */
69
70 RETURN
71 END
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