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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright by The HDF Group. *
* All rights reserved. *
* *
* This file is part of HDF5. The full HDF5 copyright notice, including *
* terms governing use, modification, and redistribution, is contained in *
* the COPYING file, which can be found at the root of the source code *
* distribution tree, or in https://www.hdfgroup.org/licenses. *
* If you do not have access to either file, you may request a copy from *
* help@hdfgroup.org. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*
* Programmer: Quincey Koziol
* Friday, January 30, 2004
*
* Purpose: Common routines for all MPI-based VFL drivers.
*
*/
#include "H5private.h" /* Generic Functions */
#include "H5CXprivate.h" /* API Contexts */
#include "H5Eprivate.h" /* Error handling */
#include "H5Fprivate.h" /* File access */
#include "H5FDprivate.h" /* File drivers */
#include "H5FDmpi.h" /* Common MPI file driver */
#include "H5Pprivate.h" /* Property lists */
#ifdef H5_HAVE_PARALLEL
/*-------------------------------------------------------------------------
* Function: H5FD_mpi_get_rank
*
* Purpose: Retrieves the rank of an MPI process.
*
* Return: Success: The rank (non-negative)
*
* Failure: Negative
*
* Programmer: Quincey Koziol
* Friday, January 30, 2004
*
*-------------------------------------------------------------------------
*/
int
H5FD_mpi_get_rank(const H5FD_t *file)
{
const H5FD_class_mpi_t *cls;
int ret_value;
FUNC_ENTER_NOAPI(FAIL)
HDassert(file);
cls = (const H5FD_class_mpi_t *)(file->cls);
HDassert(cls);
HDassert(cls->get_rank); /* All MPI drivers must implement this */
/* Dispatch to driver */
if ((ret_value = (cls->get_rank)(file)) < 0)
HGOTO_ERROR(H5E_VFL, H5E_CANTGET, FAIL, "driver get_rank request failed")
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5FD_mpi_get_rank() */
/*-------------------------------------------------------------------------
* Function: H5FD_mpi_get_size
*
* Purpose: Retrieves the size of the communicator used for the file
*
* Return: Success: The communicator size (non-negative)
*
* Failure: Negative
*
* Programmer: Quincey Koziol
* Friday, January 30, 2004
*
*-------------------------------------------------------------------------
*/
int
H5FD_mpi_get_size(const H5FD_t *file)
{
const H5FD_class_mpi_t *cls;
int ret_value;
FUNC_ENTER_NOAPI(FAIL)
HDassert(file);
cls = (const H5FD_class_mpi_t *)(file->cls);
HDassert(cls);
HDassert(cls->get_size); /* All MPI drivers must implement this */
/* Dispatch to driver */
if ((ret_value = (cls->get_size)(file)) < 0)
HGOTO_ERROR(H5E_VFL, H5E_CANTGET, FAIL, "driver get_size request failed")
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5FD_mpi_get_size() */
/*-------------------------------------------------------------------------
* Function: H5FD_mpi_get_comm
*
* Purpose: Retrieves the file's communicator
*
* Return: Success: The communicator (non-negative)
*
* Failure: Negative
*
* Programmer: Quincey Koziol
* Friday, January 30, 2004
*
*-------------------------------------------------------------------------
*/
MPI_Comm
H5FD_mpi_get_comm(const H5FD_t *file)
{
const H5FD_class_mpi_t *cls;
MPI_Comm ret_value;
FUNC_ENTER_NOAPI(MPI_COMM_NULL)
HDassert(file);
cls = (const H5FD_class_mpi_t *)(file->cls);
HDassert(cls);
HDassert(cls->get_comm); /* All MPI drivers must implement this */
/* Dispatch to driver */
if ((ret_value = (cls->get_comm)(file)) == MPI_COMM_NULL)
HGOTO_ERROR(H5E_VFL, H5E_CANTGET, MPI_COMM_NULL, "driver get_comm request failed")
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5FD_mpi_get_comm() */
/*-------------------------------------------------------------------------
* Function: H5FD_mpi_MPIOff_to_haddr
*
* Purpose: Convert an MPI_Offset value to haddr_t.
*
* Return: Success: The haddr_t equivalent of the MPI_OFF
* argument.
*
* Failure: HADDR_UNDEF
*
* Programmer: Unknown
* January 30, 1998
*
*-------------------------------------------------------------------------
*/
haddr_t
H5FD_mpi_MPIOff_to_haddr(MPI_Offset mpi_off)
{
haddr_t ret_value = HADDR_UNDEF;
FUNC_ENTER_NOAPI_NOINIT_NOERR
if (mpi_off != (MPI_Offset)(haddr_t)mpi_off)
ret_value = HADDR_UNDEF;
else
ret_value = (haddr_t)mpi_off;
FUNC_LEAVE_NOAPI(ret_value)
}
/*-------------------------------------------------------------------------
* Function: H5FD_mpi_haddr_to_MPIOff
*
* Purpose: Convert an haddr_t value to MPI_Offset.
*
* Return: Success: Non-negative, the MPI_OFF argument contains
* the converted value.
*
* Failure: Negative, MPI_OFF is undefined.
*
* Programmer: Unknown
* January 30, 1998
*
*-------------------------------------------------------------------------
*/
herr_t
H5FD_mpi_haddr_to_MPIOff(haddr_t addr, MPI_Offset *mpi_off /*out*/)
{
herr_t ret_value = FAIL;
FUNC_ENTER_NOAPI_NOINIT_NOERR
HDassert(mpi_off);
/* Convert the HDF5 address into an MPI offset */
*mpi_off = (MPI_Offset)addr;
if (addr != (haddr_t)((MPI_Offset)addr))
ret_value = FAIL;
else
ret_value = SUCCEED;
FUNC_LEAVE_NOAPI(ret_value)
}
#ifdef NOT_YET
/*-------------------------------------------------------------------------
* Function: H5FD_mpio_wait_for_left_neighbor
*
* Purpose: Blocks until (empty) msg is received from immediately
* lower-rank neighbor. In conjunction with
* H5FD_mpio_signal_right_neighbor, useful for enforcing
* 1-process-at-at-time access to critical regions to avoid race
* conditions (though it is overkill to require that the
* processes be allowed to proceed strictly in order of their
* rank).
*
* Note: This routine doesn't read or write any file, just performs
* interprocess coordination. It really should reside in a
* separate package of such routines.
*
* Return: Success: 0
* Failure: -1
*
* Programmer: rky
* 19981207
*
*-------------------------------------------------------------------------
*/
herr_t
H5FD_mpio_wait_for_left_neighbor(H5FD_t *_file)
{
H5FD_mpio_t *file = (H5FD_mpio_t *)_file;
char msgbuf[1];
MPI_Status rcvstat;
int mpi_code; /* mpi return code */
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_NOAPI(FAIL)
HDassert(file);
HDassert(H5FD_MPIO == file->pub.driver_id);
/* Portably initialize MPI status variable */
HDmemset(&rcvstat, 0, sizeof(MPI_Status));
/* p0 has no left neighbor; all other procs wait for msg */
if (file->mpi_rank != 0) {
if (MPI_SUCCESS != (mpi_code = MPI_Recv(&msgbuf, 1, MPI_CHAR, file->mpi_rank - 1, MPI_ANY_TAG,
file->comm, &rcvstat)))
HMPI_GOTO_ERROR(FAIL, "MPI_Recv failed", mpi_code)
}
done:
FUNC_LEAVE_NOAPI(ret_value)
}
/*-------------------------------------------------------------------------
* Function: H5FD_mpio_signal_right_neighbor
*
* Purpose: Blocks until (empty) msg is received from immediately
* lower-rank neighbor. In conjunction with
* H5FD_mpio_wait_for_left_neighbor, useful for enforcing
* 1-process-at-at-time access to critical regions to avoid race
* conditions (though it is overkill to require that the
* processes be allowed to proceed strictly in order of their
* rank).
*
* Note: This routine doesn't read or write any file, just performs
* interprocess coordination. It really should reside in a
* separate package of such routines.
*
* Return: Success: 0
* Failure: -1
*
* Programmer: rky
* 19981207
*
*-------------------------------------------------------------------------
*/
herr_t
H5FD_mpio_signal_right_neighbor(H5FD_t *_file)
{
H5FD_mpio_t *file = (H5FD_mpio_t *)_file;
char msgbuf[1];
int mpi_code; /* mpi return code */
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_NOAPI(FAIL)
HDassert(file);
HDassert(H5FD_MPIO == file->pub.driver_id);
if (file->mpi_rank != (file->mpi_size - 1))
if (MPI_SUCCESS !=
(mpi_code = MPI_Send(&msgbuf, 0 /*empty msg*/, MPI_CHAR, file->mpi_rank + 1, 0, file->comm)))
HMPI_GOTO_ERROR(FAIL, "MPI_Send failed", mpi_code)
done:
FUNC_LEAVE_NOAPI(ret_value)
}
#endif /* NOT_YET */
#endif /* H5_HAVE_PARALLEL */
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