/[MITgcm]/MITgcm/eesupp/inc/GLOBAL_SUM.h
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Contents of /MITgcm/eesupp/inc/GLOBAL_SUM.h

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Revision 1.4 - (show annotations) (download)
Sat Mar 27 03:51:50 2004 UTC (20 years, 1 month ago) by edhill
Branch: MAIN
CVS Tags: checkpoint57m_post, checkpoint57g_pre, checkpoint57s_post, checkpoint57b_post, checkpoint57g_post, checkpoint56b_post, checkpoint54d_post, checkpoint54e_post, checkpoint57r_post, checkpoint57d_post, checkpoint57i_post, checkpoint55, checkpoint54, checkpoint57, checkpoint56, checkpoint53, checkpoint57n_post, checkpoint54f_post, checkpoint55i_post, checkpoint57l_post, checkpoint55c_post, checkpoint57f_post, checkpoint53d_post, checkpoint57a_post, checkpoint57h_pre, checkpoint54b_post, checkpoint57h_post, checkpoint52m_post, checkpoint55g_post, checkpoint57c_post, checkpoint55d_post, checkpoint54a_pre, checkpoint53c_post, checkpoint55d_pre, checkpoint57c_pre, checkpoint55j_post, checkpoint54a_post, checkpoint55h_post, checkpoint57e_post, checkpoint55b_post, checkpoint53a_post, checkpoint55f_post, checkpoint53g_post, checkpoint57p_post, checkpoint57q_post, eckpoint57e_pre, checkpoint56a_post, checkpoint53f_post, checkpoint57h_done, checkpoint57j_post, checkpoint57f_pre, checkpoint52n_post, checkpoint53b_pre, checkpoint56c_post, checkpoint57a_pre, checkpoint55a_post, checkpoint57o_post, checkpoint57k_post, checkpoint53b_post, checkpoint53d_pre, checkpoint55e_post, checkpoint54c_post
Changes since 1.3: +2 -2 lines
File MIME type: text/plain 
 o cleanup comments (NO CODE CHANGES) in eesupp for protex
 o the "api reference" framework now builds documentation for:
     eesupp, pkg/generic_advdiff, and pkg/gmredi
 o remove mnc from the default gfd in pkg_groups pending
     further testing on systems where NetCDF is not installed
1 C $Header: /u/gcmpack/MITgcm/eesupp/inc/GLOBAL_SUM.h,v 1.3 2001/09/21 03:54:36 cnh Exp $
2 C $Name: $
3 CBOP
4 C !ROUTINE: GLOBAL_SUM.h
5 C !INTERFACE:
6 C include "GLOBAL_SUM.h"
7 C !DESCRIPTION:
8 C *==========================================================*
9 C | GLOBAL\_SUM.h |
10 C | o Globals used by Fortran global sum routine. |
11 C *==========================================================*
12 C | The global sum shared memory scheme uses global heap data|
13 C | structures (.i.e COMMON blocks ). Each thread writes to |
14 C | an its own element of the shared memory array and then |
15 C | one thread reads all the entries and sums them. The sum |
16 C | result is then read by all threads. |
17 C | Remember - you are working with regions of memory that |
18 C | are being updated concurrently by different threads. |
19 C | What happens, when it happens and who gets to see what |
20 C | happens at what stage depends on the computer systems |
21 C | memory model. Every computer has a different memory model|
22 C | and they are never simple. In all current platforms it is|
23 C | possible for one thread to see events happening in a |
24 C | different order from the order they are written in the |
25 C | code. |
26 C | Unless you understand this it is not a good idea to |
27 C | make modifications te way these header files are setup or|
28 C | the way the global sum routines work. |
29 C *==========================================================*
30 CEOP
31 COMMON / GSUM_COMMON_R8 / phiGSRL
32 Real*8 phiGSRL(lShare8, MAX_NO_THREADS )
33
34 COMMON / GSUM_COMMON_R4 / phiGSRS
35 Real*4 phiGSRS(lShare4, MAX_NO_THREADS )
36
37 COMMON / GSUM_COMMON_I / phiGSI
38 INTEGER phiGSI (lShare4, MAX_NO_THREADS )
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