85 строки
2.0 KiB
Plaintext
85 строки
2.0 KiB
Plaintext
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.\" -*- nroff -*-
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.\" Copyright (c) 2015 University of Houston. All rights reserved.
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.\" Copyright (c) 2015 Mellanox Technologies, Inc.
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.\" $COPYRIGHT$
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.de Vb
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.ft CW
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.nf
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..
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.de Ve
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.ft R
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.fi
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..
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.TH "SHMEM\\_INIT" "3" "#OMPI_DATE#" "#PACKAGE_VERSION#" "#PACKAGE_NAME#"
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.SH NAME
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shmem_init, start_pes
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\- Allocates a block of memory from the symmetric heap.
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.SH SYNOPSIS
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C or C++:
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.Vb
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void shmem_init(void);
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void start_pes(int npes);
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.Ve
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Fortran:
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.Vb
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CALL SHMEM_INIT()
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CALL START_PES(npes)
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.Ve
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.SH DESCRIPTION
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The start_pes routine should be the first statement in a SHMEM parallel program.
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.PP
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The start_pes routine accepts the following argument:
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.TP
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npes
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Unused. Should be set to 0.
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.PP
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This routine initializes the SHMEM API, therefore it must be called before calling any
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other SHMEM routine.
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This routine is responsible inter alia for setting up the symmetric heap on the calling PE, and
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the creation of the virtual PE numbers. Upon successful return from this routine, the calling PE
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will be able to communicate with and transfer data to other PEs.
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.PP
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Multiple calls to this function are not allowed.
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.PP
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For an overview of programming with SHMEM communication routines, example SHMEM
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programs, and instructions for compiling SHMEM programs, see the \fIintro_shmem\fP(3)
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man page.
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.SH EXAMPLES
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This is a simple program that calls \fIshmem_integer_put\fP(3):
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.Vb
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PROGRAM PUT
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INCLUDE "mpp/shmem.fh"
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INTEGER TARG, SRC, RECEIVER, BAR
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COMMON /T/ TARG
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PARAMETER (RECEIVER=1)
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CALL SHMEM_INIT()
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IF (MY_PE() .EQ. 0) THEN
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SRC = 33
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CALL SHMEM_INTEGER_PUT(TARG, SRC, 1, RECEIVER)
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ENDIF
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CALL SHMEM_BARRIER_ALL ! SYNCHRONIZES SENDER AND RECEIVER
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IF (MY_PE() .EQ. RECEIVER) THEN
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PRINT *,'PE ', MY_PE(),' TARG=',TARG,' (expect 33)'
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ENDIF
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END
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.Ve
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.SH NOTES
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If the start_pes call is not the first statement in a program, unexpected results may occur on
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some architectures.
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.SH SEE ALSO
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\fIintro_shmem\fP(3),
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\fIshmem_barrier\fP(3),
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\fIshmem_barrier_all\fP(3),
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\fIshmem_put\fP(3),
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\fImy_pe\fP(3I),
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\fIshmem_n_pes\fP(3I)
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