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Implement support for big I/O for independent reads (#1446) #1719

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May 3, 2022
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Implement support for big I/O for independent reads (#1446) #1719

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50 changes: 34 additions & 16 deletions src/H5FDmpio.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1202,6 +1202,7 @@ H5FD__mpio_read(H5FD_t *_file, H5FD_mem_t H5_ATTR_UNUSED type, hid_t H5_ATTR_UNU
int n;
#endif
hbool_t use_view_this_time = FALSE;
hbool_t derived_type = FALSE;
hbool_t rank0_bcast = FALSE; /* If read-with-rank0-and-bcast flag was used */
#ifdef H5FDmpio_DEBUG
hbool_t H5FD_mpio_debug_t_flag = (H5FD_mpio_debug_flags_s[(int)'t'] && H5FD_MPIO_TRACE_THIS_RANK(file));
Expand Down Expand Up @@ -1229,8 +1230,6 @@ H5FD__mpio_read(H5FD_t *_file, H5FD_mem_t H5_ATTR_UNUSED type, hid_t H5_ATTR_UNU
if (H5FD_mpi_haddr_to_MPIOff(addr, &mpi_off /*out*/) < 0)
HGOTO_ERROR(H5E_INTERNAL, H5E_BADRANGE, FAIL, "can't convert from haddr to MPI off")
size_i = (int)size;
if ((hsize_t)size_i != size)
HGOTO_ERROR(H5E_INTERNAL, H5E_BADRANGE, FAIL, "can't convert from size to size_i")

#ifdef H5FDmpio_DEBUG
if (H5FD_mpio_debug_r_flag)
Expand Down Expand Up @@ -1340,6 +1339,21 @@ H5FD__mpio_read(H5FD_t *_file, H5FD_mem_t H5_ATTR_UNUSED type, hid_t H5_ATTR_UNU
HMPI_GOTO_ERROR(FAIL, "MPI_File_set_view failed", mpi_code)
} /* end if */
else {
if (size != (hsize_t)size_i) {
/* If HERE, then we need to work around the integer size limit
* of 2GB. The input size_t size variable cannot fit into an integer,
* but we can get around that limitation by creating a different datatype
* and then setting the integer size (or element count) to 1 when using
* the derived_type.
*/

if (H5_mpio_create_large_type(size, 0, MPI_BYTE, &buf_type) < 0)
HGOTO_ERROR(H5E_INTERNAL, H5E_CANTGET, FAIL, "can't create MPI-I/O datatype")

derived_type = TRUE;
size_i = 1;
}

#ifdef H5FDmpio_DEBUG
if (H5FD_mpio_debug_r_flag)
HDfprintf(stderr, "%s: (%d) doing MPI independent IO\n", FUNC, file->mpi_rank);
Expand Down Expand Up @@ -1409,6 +1423,9 @@ H5FD__mpio_read(H5FD_t *_file, H5FD_mem_t H5_ATTR_UNUSED type, hid_t H5_ATTR_UNU
HDmemset((char *)buf + bytes_read, 0, (size_t)n);

done:
if (derived_type)
MPI_Type_free(&buf_type);

#ifdef H5FDmpio_DEBUG
if (H5FD_mpio_debug_t_flag)
HDfprintf(stderr, "%s: (%d) Leaving\n", FUNC, file->mpi_rank);
Expand Down Expand Up @@ -1527,20 +1544,6 @@ H5FD__mpio_write(H5FD_t *_file, H5FD_mem_t type, hid_t H5_ATTR_UNUSED dxpl_id, h
*/
mpi_off = 0;
} /* end if */
else if (size != (hsize_t)size_i) {
/* If HERE, then we need to work around the integer size limit
* of 2GB. The input size_t size variable cannot fit into an integer,
* but we can get around that limitation by creating a different datatype
* and then setting the integer size (or element count) to 1 when using
* the derived_type.
*/

if (H5_mpio_create_large_type(size, 0, MPI_BYTE, &buf_type) < 0)
HGOTO_ERROR(H5E_INTERNAL, H5E_CANTGET, FAIL, "can't create MPI-I/O datatype")

derived_type = TRUE;
size_i = 1;
}

/* Write the data. */
if (use_view_this_time) {
Expand Down Expand Up @@ -1586,6 +1589,21 @@ H5FD__mpio_write(H5FD_t *_file, H5FD_mem_t type, hid_t H5_ATTR_UNUSED dxpl_id, h
HMPI_GOTO_ERROR(FAIL, "MPI_File_set_view failed", mpi_code)
} /* end if */
else {
if (size != (hsize_t)size_i) {
/* If HERE, then we need to work around the integer size limit
* of 2GB. The input size_t size variable cannot fit into an integer,
* but we can get around that limitation by creating a different datatype
* and then setting the integer size (or element count) to 1 when using
* the derived_type.
*/

if (H5_mpio_create_large_type(size, 0, MPI_BYTE, &buf_type) < 0)
HGOTO_ERROR(H5E_INTERNAL, H5E_CANTGET, FAIL, "can't create MPI-I/O datatype")

derived_type = TRUE;
size_i = 1;
}

#ifdef H5FDmpio_DEBUG
if (H5FD_mpio_debug_w_flag)
HDfprintf(stderr, "%s: (%d) doing MPI independent IO\n", FUNC, file->mpi_rank);
Expand Down