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/*
* Copyright (c) 2018 DataDirect Networks. All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "ompi_config.h"
#include "fbtl_ime.h"
#include "mpi.h"
#include "ompi/constants.h"
#include "ompi/mca/fbtl/fbtl.h"
static ssize_t mca_fbtl_ime_blocking_op(ompio_file_t *fh, int io_op);
ssize_t mca_fbtl_ime_preadv(ompio_file_t *fh)
{
return mca_fbtl_ime_blocking_op(fh, FBTL_IME_READ);
}
ssize_t mca_fbtl_ime_pwritev(ompio_file_t *fh)
{
return mca_fbtl_ime_blocking_op(fh, FBTL_IME_WRITE);
}
static ssize_t mca_fbtl_ime_blocking_op(ompio_file_t *fh, int io_op)
{
int i, block = 1, ret;
struct iovec *iov = NULL;
int iov_count = 0;
OMPI_MPI_OFFSET_TYPE iov_offset = 0;
ssize_t bytes_processed = 0, ret_code = 0;
if (NULL == fh->f_io_array) {
return OMPI_ERROR;
}
iov = (struct iovec *) malloc
(OMPIO_IOVEC_INITIAL_SIZE * sizeof (struct iovec));
if (NULL == iov) {
opal_output(1, "OUT OF MEMORY\n");
return OMPI_ERR_OUT_OF_RESOURCE;
}
/* Go through all IO entries and try to aggregate them. */
for (i = 0 ; i < fh->f_num_of_io_entries; i++) {
iov[iov_count].iov_base = fh->f_io_array[i].memory_address;
iov[iov_count].iov_len = fh->f_io_array[i].length;
iov_count++;
/* Save the file offset if the current iovec is
the first one in the iovec array. */
if (iov_count == 1) {
iov_offset = (OMPI_MPI_OFFSET_TYPE)(intptr_t)fh->f_io_array[i].offset;
}
/* Allocate more memory for the iovecs if necessary */
if (iov_count == OMPIO_IOVEC_INITIAL_SIZE * block) {
block++;
struct iovec *new_iov = (struct iovec *) realloc(iov,
OMPIO_IOVEC_INITIAL_SIZE * block * sizeof(struct iovec));
if (new_iov == NULL) {
free(iov);
opal_output(1, "OUT OF MEMORY\n");
return OMPI_ERR_OUT_OF_RESOURCE;
}
}
/* If:
- There is no next iovec
- OR the next iovec is not "contiguous"
- OR we exceeded the advised number of iovecs for IME
Then: pwritev/preadv shall be called,
and the iovec array reset */
if (i+1 == fh->f_num_of_io_entries ||
((OMPI_MPI_OFFSET_TYPE)(intptr_t)fh->f_io_array[i].offset +
(ptrdiff_t)fh->f_io_array[i].length) !=
(OMPI_MPI_OFFSET_TYPE)(intptr_t)fh->f_io_array[i+1].offset ||
iov_count >= mca_fbtl_ime_iov_max ) {
switch (io_op) {
case FBTL_IME_READ:
ret_code = ime_native_preadv(fh->fd, iov, iov_count, iov_offset);
if (ret_code < 0) {
opal_output(1, "mca_fbtl_ime_blocking_op: error in "
"ime_native_preadv error ret=%zd %s",
ret_code, strerror(errno));
goto error_exit;
}
break;
case FBTL_IME_WRITE:
ret_code = ime_native_pwritev(fh->fd, iov, iov_count, iov_offset);
if (ret_code < 0) {
opal_output(1, "mca_fbtl_ime_blocking_op: error in "
"ime_native_pwritev error ret=%zd %s",
ret_code, strerror(errno));
goto error_exit;
}
break;
default:
opal_output(1, "mca_fbtl_ime_blocking_op: an unsupported "
"IO operation was requested. io_op=%d", io_op);
goto error_exit;
}
bytes_processed += ret_code;
iov_count = 0;
}
}
free (iov);
return bytes_processed;
error_exit:
free(iov);
return OMPI_ERROR;
}
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