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Special Lectures on Parallel ProgrammingPowerPoint Presentation

Special Lectures on Parallel Programming

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Memory - Hierarchy

Typical Capacity

Typical Access Time

Registers

< 1 KB

1 nsec

Cache

L1+L2 = 640 K

2 nsec

Main Memory

512~1024 MB

10 nsec

Cost = 0.04 cent/KB

Magnetic Disks

8 msec

100~400 GB

Cost = 0.03 cent/KB

Magnetic Tapes

> 1 TB

100 sec

C23456 1 2 3 4 5 6 |

PROGRAM CARTESIAN

INCLUDE 'mpif.h'

INTEGER DIMS(2),COM2D,COORDS(2),SRC,DEST,GOORDS(2)

LOGICAL PERI(2),REORDER

CHARACTER*80 DUMMY

C

CALL ENVIRON(NODENUM,NPROC)

ID = NODENUM

IF (ID .EQ. 0) OPEN(10,FILE='test0',STATUS='UNKNOWN')

IF (ID .EQ. 1) OPEN(11,FILE='test1',STATUS='UNKNOWN')

IF (ID .EQ. 2) OPEN(12,FILE='test2',STATUS='UNKNOWN')

IF (ID .EQ. 3) OPEN(13,FILE='test3',STATUS='UNKNOWN')

IF (ID .EQ. 4) OPEN(14,FILE='test4',STATUS='UNKNOWN')

IF (ID .EQ. 5) OPEN(15,FILE='test5',STATUS='UNKNOWN')

MJMP = 2

GOORDS(1) = 1

GOORDS(2) = 2

DIMS(1) = 3

DIMS(2) = 2

PERI(1) = .TRUE.

PERI(2) = .TRUE.

REORDER = .FALSE.

CALL MPI_CART_CREATE(0,2,DIMS,PERI,REORDER,COM2D,IERR)

CALL MPI_CART_COORDS(COM2D,NODENUM,2,COORDS,IERR)

CALL MPI_CART_RANK(COM2D,GOORDS,NUMBER,IERR)

IF (NODENUM .EQ. 0) PRINT *, NUMBER

CALL MPI_CART_SHIFT(COM2D,0,MJMP,SRC,DEST,IERR)

DO I=0,5

IF (NODENUM .EQ. I) THEN

WRITE( * ,100) NODENUM,COORDS(1),COORDS(2),SRC,DEST

ENDIF

C CALL MPI_BARRIER(0,IERR)

ENDDO

IF (ID .EQ. 0) WRITE(10,100) ID,COORDS(1),COORDS(2),SRC,DEST

IF (ID .EQ. 1) WRITE(11,100) ID,COORDS(1),COORDS(2),SRC,DEST

IF (ID .EQ. 2) WRITE(12,100) ID,COORDS(1),COORDS(2),SRC,DEST

IF (ID .EQ. 3) WRITE(13,100) ID,COORDS(1),COORDS(2),SRC,DEST

IF (ID .EQ. 4) WRITE(14,100) ID,COORDS(1),COORDS(2),SRC,DEST

IF (ID .EQ. 5) WRITE(15,100) ID,COORDS(1),COORDS(2),SRC,DEST

C

100 FORMAT('NODE',I3,' is at (',I2,',',I2,'). from',I3,' and to',I3)

CALL MPI_FINALIZE(IER)

STOP

END

C ---------------------------- End of MAIN ----------------------------

SUBROUTINE ENVIRON(NODENUM,NPROC)

INCLUDE 'mpif.h'

CALL MPI_INIT(IER)

CALL MPI_COMM_RANK(0,NODENUM,IER)

CALL MPI_COMM_SIZE(0,NPROC,IER)

RETURN

END

C ---------------------------- End of ENVIRON ------------------------

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