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C $Header: $ |
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SUBROUTINE EXCH_CYCLE_EBL( myThid ) |
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C /==========================================================\ |
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C | SUBROUTINE EXCH_CYCLE_EBL | |
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C | o Cycle exchange buffer level. | |
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C |==========================================================| |
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C | Step the "exchange buffer level" to next value. | |
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C | The buffer level is used to prevent consecutive messages | |
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C | overwriting one another. Because we know that every tile | |
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C | will participate in an exchange we can be sure that every| |
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C | tile will cycle through the buffers with the same | |
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C | sequence. Also we know that a tile cannot start a new | |
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C | exchange before it has completed its end of the previous | |
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C | exchange. Thus by cycling through three buffer levels we | |
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C | can be sure that the buffer we write to will be free. | |
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C | That is by the time we are participating in the third | |
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C | exchange transaction we know that both ends of the first | |
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C | transaction must have completed. | |
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C | Note -- | |
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C | 1. We allow more than three levels below although this | |
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C | is not necessary. | |
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C \==========================================================/ |
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IMPLICIT NONE |
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C == Global data == |
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#include "SIZE.h" |
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#include "EEPARAMS.h" |
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#include "EESUPPORT.h" |
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#include "EXCH.h" |
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C == Routine arguments == |
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C myThid - Thread number of this instance of the routine |
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INTEGER myThid |
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C == Local variables == |
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C bi, bj - Loop counters |
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INTEGER bi, bj |
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DO bj=myByLo(myThid),myByHi(myThid) |
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DO bi=myBxLo(myThid),myBxHi(myThid) |
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C-- Use next level exchange buffer in cycle. |
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exchangeBufLevel(1,bi,bj) = exchangeBufLevel(1,bi,bj)+1 |
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IF ( exchangeBufLevel(1,bi,bj) .GT. NUMBER_OF_BUFFER_LEVELS ) |
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& exchangeBufLevel(1,bi,bj) = 1 |
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ENDDO |
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ENDDO |
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RETURN |
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END |