268 строки
9.3 KiB
C
268 строки
9.3 KiB
C
/*
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* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
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* University Research and Technology
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* Corporation. All rights reserved.
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* Copyright (c) 2004-2011 The University of Tennessee and The University
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* of Tennessee Research Foundation. All rights
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* reserved.
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* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
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* University of Stuttgart. All rights reserved.
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* Copyright (c) 2004-2005 The Regents of the University of California.
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* All rights reserved.
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* Copyright (c) 2008-2011 University of Houston. All rights reserved.
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* $COPYRIGHT$
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*
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* Additional copyrights may follow
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*
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* $HEADER$
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*/
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#include "ompi_config.h"
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#include "fbtl_posix.h"
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#include "mpi.h"
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#include <unistd.h>
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#include "ompi/constants.h"
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#include "ompi/mca/fbtl/fbtl.h"
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size_t
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mca_fbtl_posix_preadv (mca_io_ompio_file_t *fh,
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int *sorted)
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{
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/*int *fp = NULL;*/
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int i, block=1;
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struct iovec *iov = NULL;
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int iov_count = 0;
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OMPI_MPI_OFFSET_TYPE iov_offset = 0;
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#if 0
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int k;
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int merge = 0;
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char *merge_buf = NULL;
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size_t merge_length = 0;
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OMPI_MPI_OFFSET_TYPE merge_offset = 0;
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#endif
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if (NULL == fh->f_io_array) {
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return OMPI_ERROR;
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}
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/*
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fp = (int *)fh->fd;
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if (0 == *fp)
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{
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return OMPI_ERROR;
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}
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*/
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#if 1
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iov = (struct iovec *) malloc
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(OMPIO_IOVEC_INITIAL_SIZE * sizeof (struct iovec));
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if (NULL == iov) {
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opal_output(1, "OUT OF MEMORY\n");
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return OMPI_ERR_OUT_OF_RESOURCE;
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}
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if (NULL != sorted) {
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for (i=0 ; i<fh->f_num_of_io_entries ; i++) {
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if (0 == iov_count) {
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iov[iov_count].iov_base = fh->f_io_array[sorted[i]].memory_address;
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iov[iov_count].iov_len = fh->f_io_array[sorted[i]].length;
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iov_offset = (OMPI_MPI_OFFSET_TYPE)(intptr_t)fh->f_io_array[sorted[i]].offset;
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iov_count ++;
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}
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if (OMPIO_IOVEC_INITIAL_SIZE*block <= iov_count) {
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block ++;
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iov = (struct iovec *)realloc
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(iov, OMPIO_IOVEC_INITIAL_SIZE * block *
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sizeof(struct iovec));
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if (NULL == iov) {
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opal_output(1, "OUT OF MEMORY\n");
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return OMPI_ERR_OUT_OF_RESOURCE;
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}
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}
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if (fh->f_num_of_io_entries != i+1) {
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if (((OMPI_MPI_OFFSET_TYPE)(intptr_t)fh->f_io_array[sorted[i]].offset +
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(OPAL_PTRDIFF_TYPE)fh->f_io_array[sorted[i]].length) ==
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(OMPI_MPI_OFFSET_TYPE)(intptr_t)fh->f_io_array[sorted[i+1]].offset) {
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iov[iov_count].iov_base =
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fh->f_io_array[sorted[i+1]].memory_address;
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iov[iov_count].iov_len = fh->f_io_array[sorted[i+1]].length;
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iov_count ++;
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continue;
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}
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}
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if (-1 == lseek (fh->fd, iov_offset, SEEK_SET)) {
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perror ("fseek");
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return OMPI_ERROR;
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}
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if (-1 == readv (fh->fd, iov, iov_count)) {
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perror ("readv");
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return OMPI_ERROR;
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}
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else {
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iov_count = 0;
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}
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}
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}
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else {
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for (i=0 ; i<fh->f_num_of_io_entries ; i++) {
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if (0 == iov_count) {
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iov[iov_count].iov_base = fh->f_io_array[i].memory_address;
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iov[iov_count].iov_len = fh->f_io_array[i].length;
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iov_offset = (OMPI_MPI_OFFSET_TYPE)(intptr_t)fh->f_io_array[i].offset;
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iov_count ++;
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}
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if (OMPIO_IOVEC_INITIAL_SIZE*block <= iov_count) {
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block ++;
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iov = (struct iovec *)realloc
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(iov, OMPIO_IOVEC_INITIAL_SIZE * block *
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sizeof(struct iovec));
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if (NULL == iov) {
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opal_output(1, "OUT OF MEMORY\n");
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return OMPI_ERR_OUT_OF_RESOURCE;
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}
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}
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if (fh->f_num_of_io_entries != i+1) {
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if (((OMPI_MPI_OFFSET_TYPE)(intptr_t)fh->f_io_array[i].offset +
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(OPAL_PTRDIFF_TYPE)fh->f_io_array[i].length) ==
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(OMPI_MPI_OFFSET_TYPE)(intptr_t)fh->f_io_array[i+1].offset) {
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iov[iov_count].iov_base =
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fh->f_io_array[i+1].memory_address;
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iov[iov_count].iov_len = fh->f_io_array[i+1].length;
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iov_count ++;
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continue;
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}
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}
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if (-1 == lseek (fh->fd, iov_offset, SEEK_SET)) {
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perror ("fseek");
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return OMPI_ERROR;
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}
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if (-1 == readv (fh->fd, iov, iov_count)) {
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perror ("readv");
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return OMPI_ERROR;
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}
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else {
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iov_count = 0;
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}
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}
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}
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if (NULL != iov) {
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free (iov);
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iov = NULL;
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}
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#endif
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#if 0
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if (NULL != sorted) {
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for (i=0 ; i<fh->f_num_of_io_entries ; i++) {
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if (fh->f_num_of_io_entries != i+1) {
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if (((OMPI_MPI_OFFSET_TYPE)fh->f_io_array[sorted[i]].offset +
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(OPAL_PTRDIFF_TYPE)fh->f_io_array[sorted[i]].length) ==
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(OMPI_MPI_OFFSET_TYPE)fh->f_io_array[sorted[i+1]].offset) {
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if (!merge) {
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merge_offset = (OMPI_MPI_OFFSET_TYPE)
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fh->f_io_array[sorted[i]].offset;
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merge_length = fh->f_io_array[sorted[i]].length;
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}
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merge_length += fh->f_io_array[sorted[i+1]].length;
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merge++;
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continue;
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}
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}
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if (merge) {
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merge_buf = malloc (merge_length);
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if (-1 == pread(fh->fd,
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merge_buf,
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merge_length,
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merge_offset)) {
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perror("pread() error");
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return OMPI_ERROR;
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}
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k = 0;
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while (merge >= 0) {
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memcpy (fh->f_io_array[sorted[i-merge]].memory_address,
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merge_buf + k,
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fh->f_io_array[sorted[i-merge]].length);
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k += fh->f_io_array[sorted[i-merge]].length;
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merge --;
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}
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merge = 0;
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merge_offset = 0;
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merge_length = 0;
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if (NULL != merge_buf) {
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free (merge_buf);
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merge_buf = NULL;
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}
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}
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else {
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if (-1 == pread(fh->fd,
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fh->f_io_array[sorted[i]].memory_address,
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fh->f_io_array[sorted[i]].length,
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(OMPI_MPI_OFFSET_TYPE)fh->f_io_array[sorted[i]].offset)) {
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perror("pread() error");
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return OMPI_ERROR;
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}
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}
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}
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}
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else {
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for (i=0 ; i<fh->f_num_of_io_entries ; i++) {
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if (fh->f_num_of_io_entries != i+1) {
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if (((OMPI_MPI_OFFSET_TYPE)fh->f_io_array[i].offset +
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(OPAL_PTRDIFF_TYPE)fh->f_io_array[i].length) ==
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(OMPI_MPI_OFFSET_TYPE)fh->f_io_array[i+1].offset) {
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if (!merge) {
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merge_offset = (OMPI_MPI_OFFSET_TYPE)
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fh->f_io_array[i].offset;
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merge_length = fh->f_io_array[i].length;
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}
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merge_length += fh->f_io_array[i+1].length;
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merge++;
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continue;
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}
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}
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if (merge) {
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merge_buf = malloc (merge_length);
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if (-1 == pread(fh->fd,
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merge_buf,
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merge_length,
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merge_offset)) {
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perror("pread() error");
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return OMPI_ERROR;
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}
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k = 0;
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while (merge >= 0) {
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memcpy (fh->f_io_array[i-merge].memory_address,
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merge_buf + k,
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fh->f_io_array[i-merge].length);
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k += fh->f_io_array[i-merge].length;
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merge --;
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}
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merge = 0;
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merge_offset = 0;
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merge_length = 0;
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if (NULL != merge_buf) {
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free (merge_buf);
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merge_buf = NULL;
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}
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}
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else {
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if (-1 == pread(fh->fd,
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fh->f_io_array[i].memory_address,
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fh->f_io_array[i].length,
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(OMPI_MPI_OFFSET_TYPE)fh->f_io_array[i].offset)) {
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perror("pread() error");
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return OMPI_ERROR;
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}
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}
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}
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}
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#endif
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return OMPI_SUCCESS;
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}
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