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Contents of /MITgcm/eesupp/inc/BAR2.h

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Revision 1.3 - (show annotations) (download)
Fri Sep 21 03:54:35 2001 UTC (19 years, 2 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, 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 1.2: +38 -32 lines
File MIME type: text/plain
Starting to bring comments up to date and format comments
for document extraction of "prototypes".

1 C $Header: /u/gcmpack/models/MITgcmUV/eesupp/inc/BAR2.h,v 1.2 2001/02/04 14:38:41 cnh Exp $
2 C $Name: $
3 C
7 C include "BAR2.h"
9 C *==========================================================*
10 C | BAR2.h
11 C | o Globals used by BAR2 Fortran barrier routine.
12 C |==========================================================*
13 C | These variables support a simple Fortran shared memory
14 C | barrier routine. They do busy waiting, that is the
15 C | thread that is waiting sits in a tight loop reading
16 C | some memory location and waiting for all other threads.
17 C | On some systems this is sometimes a good method to use.
18 C | On the T3E memory is not shared so the routine should
19 C | use the T3E "eureka" barriers. On CRAY and NEC there are
20 C | hardware barriers that are accessed through a compiler
21 C | directives. Finally proper multi-threading compilers
22 C | support barrier compile directives - sometimes these
23 C | are good, sometimes they are lousy.
24 C | The barrier mechanism is used as follows
25 C | 1. In the single-threaded part of the code
27 C | on CRAY, NEC this routine does nothing
28 C | on T3E there is no single-threaded code
29 C | but there may be barrier initialisation -
30 C | need to check.
31 C | 2. When we need to synchronize everybody just
32 C | CALL BAR2( myThid )
33 C | where myThid is myThreadId
34 C | on CRAY, NEC FBAR will just do C$DIR BARRIER
35 C | or CALL BARRIER or the like.
36 C | on T3E FBAR does CALL BARRIER(...) or something
37 C | need to check this.
38 C *==========================================================*
41 & BAR2_level,
42 & BAR2_barrierCount,
43 & BAR2_spinsCount, BAR2_spinsMax, BAR2_spinsMin
44 INTEGER BAR2_level(cacheLineSize/4,MAX_NO_THREADS)
45 INTEGER BAR2_barrierCount(cacheLineSize/4,MAX_NO_THREADS)
46 INTEGER BAR2_spinsCount(cacheLineSize/4,MAX_NO_THREADS)
47 INTEGER BAR2_spinsMax(cacheLineSize/4,MAX_NO_THREADS)
48 INTEGER BAR2_spinsMin(cacheLineSize/4,MAX_NO_THREADS)
50 COMMON /BAR2_L/ bar2CollectStatistics
51 LOGICAL bar2CollectStatistics

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