Special Lectures on Parallel

Programming

김 재 삼

2005 년 8 월

Memory - Hierarchy

Registers

Cache

Main Memory

Magnetic Disks

Magnetic Tapes

< 1 KB

L1+L2 = 640 K

512~1024 MB

100~400 GB

> 1 TB

1 nsec

2 nsec

10 nsec

8 msec

100 sec

Typical Access Time Typical Capacity

Cost = 0.03 cent/KB

Cost = 0.04 cent/KB

$INIT ONC23456 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 DUMMYC 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 ENDIFC 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,DESTC

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 ------------------------