mpid_ssend.c

mpi并行计算的c++代码 可用vc或gcc编译通过 可以用来搭建并行计算试验环境

/* -*- Mode: C; c-basic-offset:4 ; -*- */
/*
 *  (C) 2001 by Argonne National Laboratory.
 *      See COPYRIGHT in top-level directory.
 */

#include "mpidimpl.h"

/* FIXME: HOMOGENEOUS SYSTEMS ONLY -- no data conversion is performed */

/*
 * MPID_Ssend()
 */
#undef FUNCNAME
#define FUNCNAME MPID_Ssend
#undef FCNAME
#define FCNAME MPIDI_QUOTE(FUNCNAME)
int MPID_Ssend(const void * buf, int count, MPI_Datatype datatype, int rank, int tag, MPID_Comm * comm, int context_offset,
	       MPID_Request ** request)
{
    MPIDI_msg_sz_t data_sz;
    int dt_contig;
    MPI_Aint dt_true_lb;
    MPID_Datatype * dt_ptr;
    MPID_Request * sreq = NULL;
    MPIDI_VC_t * vc;
#if defined(MPID_USE_SEQUENCE_NUMBERS)
    MPID_Seqnum_t seqnum;
#endif    
    int mpi_errno = MPI_SUCCESS;
    MPIDI_STATE_DECL(MPID_STATE_MPID_SSEND);

    MPIDI_FUNC_ENTER(MPID_STATE_MPID_SSEND);

    MPIDI_DBG_PRINTF((10, FCNAME, "entering"));
    MPIDI_DBG_PRINTF((15, FCNAME, "rank=%d, tag=%d, context=%d", rank, tag, comm->context_id + context_offset));

    if (rank == comm->rank && comm->comm_kind != MPID_INTERCOMM)
    {
	mpi_errno = MPIDI_Isend_self(buf, count, datatype, rank, tag, comm, context_offset, MPIDI_REQUEST_TYPE_SSEND, &sreq);
#       if (MPICH_THREAD_LEVEL < MPI_THREAD_MULTIPLE)
	{
	    /* --BEGIN ERROR HANDLING-- */
	    if (sreq != NULL && sreq->cc != 0)
	    {
		mpi_errno = MPIR_Err_create_code(MPI_SUCCESS, MPIR_ERR_RECOVERABLE, FCNAME, __LINE__, MPI_ERR_OTHER,
						 "**dev|selfsenddeadlock", 0);
		goto fn_exit;
	    }
	    /* --END ERROR HANDLING-- */
	}
#	endif
	goto fn_exit;
    }
    
    if (rank == MPI_PROC_NULL)
    {
	goto fn_exit;
    }

    MPIDI_Datatype_get_info(count, datatype, dt_contig, data_sz, dt_ptr, dt_true_lb);

    MPIDI_Comm_get_vc(comm, rank, &vc);
	
    MPIDI_Request_create_sreq(sreq, mpi_errno, goto fn_exit);
    MPIDI_Request_set_type(sreq, MPIDI_REQUEST_TYPE_SSEND);
    
    /* FIXME: Since the request is never returned to the user and they can't do things like cancel it or wait on it, we may not
       need to fill in all of the fields.  For example, it may be completely unnecessary to supply the matching information.  Also,
       some of the fields can be set after the message has been sent.  These issues should be looked at more closely when we are
       trying to squeeze those last few nanoseconds out of the code.  */
    
    if (data_sz == 0)
    {
	MPIDI_CH3_Pkt_t upkt;
	MPIDI_CH3_Pkt_eager_sync_send_t * const es_pkt = &upkt.eager_sync_send;

	MPIDI_DBG_PRINTF((15, FCNAME, "sending zero length message"));

	sreq->cc = 2;
	sreq->dev.ca = MPIDI_CH3_CA_COMPLETE;
	
	MPIDI_Pkt_init(es_pkt, MPIDI_CH3_PKT_EAGER_SYNC_SEND);
	es_pkt->match.rank = comm->rank;
	es_pkt->match.tag = tag;
	es_pkt->match.context_id = comm->context_id + context_offset;
	es_pkt->sender_req_id = sreq->handle;
	es_pkt->data_sz = 0;

	MPIDI_VC_FAI_send_seqnum(vc, seqnum);
	MPIDI_Pkt_set_seqnum(es_pkt, seqnum);
	MPIDI_Request_set_seqnum(sreq, seqnum);
	
	mpi_errno = MPIDI_CH3_iSend(vc, sreq, es_pkt, sizeof(*es_pkt));
	/* --BEGIN ERROR HANDLING-- */
	if (mpi_errno != MPI_SUCCESS)
	{
	    MPIU_Object_set_ref(sreq, 0);
	    MPIDI_CH3_Request_destroy(sreq);
	    sreq = NULL;
	    mpi_errno = MPIR_Err_create_code(mpi_errno, MPIR_ERR_FATAL, FCNAME, __LINE__, MPI_ERR_OTHER, "**ch3|eagermsg", 0);
	    goto fn_exit;
	}
	/* --END ERROR HANDLING-- */
	
	goto fn_exit;
    }
    
    /* FIXME: flow control: limit number of outstanding eager messsages containing data and need to be buffered by the receiver */

    if (data_sz + sizeof(MPIDI_CH3_Pkt_eager_sync_send_t) <= MPIDI_CH3_EAGER_MAX_MSG_SIZE)
    {
	MPIDI_CH3_Pkt_t upkt;
	MPIDI_CH3_Pkt_eager_sync_send_t * const es_pkt = &upkt.eager_sync_send;
	MPID_IOV iov[MPID_IOV_LIMIT];
	    
	sreq->cc = 2;
	sreq->dev.ca = MPIDI_CH3_CA_COMPLETE;
	
	MPIDI_Pkt_init(es_pkt, MPIDI_CH3_PKT_EAGER_SYNC_SEND);
	es_pkt->match.rank = comm->rank;
	es_pkt->match.tag = tag;
	es_pkt->match.context_id = comm->context_id + context_offset;
	es_pkt->sender_req_id = sreq->handle;
	es_pkt->data_sz = data_sz;

	iov[0].MPID_IOV_BUF = (MPID_IOV_BUF_CAST)es_pkt;
	iov[0].MPID_IOV_LEN = sizeof(*es_pkt);

	if (dt_contig)
	{
	    MPIDI_DBG_PRINTF((15, FCNAME, "sending contiguous sync eager message, data_sz=" MPIDI_MSG_SZ_FMT, data_sz));
	    
	    iov[1].MPID_IOV_BUF = (MPID_IOV_BUF_CAST) ((char *)buf + dt_true_lb);
	    iov[1].MPID_IOV_LEN = data_sz;
	    
	    MPIDI_VC_FAI_send_seqnum(vc, seqnum);
	    MPIDI_Pkt_set_seqnum(es_pkt, seqnum);
	    MPIDI_Request_set_seqnum(sreq, seqnum);
	    
	    mpi_errno = MPIDI_CH3_iSendv(vc, sreq, iov, 2);
	    /* --BEGIN ERROR HANDLING-- */
	    if (mpi_errno != MPI_SUCCESS)
	    {
		MPIU_Object_set_ref(sreq, 0);
		MPIDI_CH3_Request_destroy(sreq);
		sreq = NULL;
		mpi_errno = MPIR_Err_create_code(mpi_errno, MPIR_ERR_FATAL, FCNAME, __LINE__, MPI_ERR_OTHER, "**ch3|eagermsg", 0);
		goto fn_exit;
	    }
	    /* --END ERROR HANDLING-- */
	}
	else
	{
	    int iov_n;
	    
	    MPIDI_DBG_PRINTF((15, FCNAME, "sending non-contiguous sync eager message, data_sz=" MPIDI_MSG_SZ_FMT, data_sz));
	    
	    MPID_Segment_init(buf, count, datatype, &sreq->dev.segment, 0);
	    sreq->dev.segment_first = 0;
	    sreq->dev.segment_size = data_sz;
	    
	    iov_n = MPID_IOV_LIMIT - 1;
	    mpi_errno = MPIDI_CH3U_Request_load_send_iov(sreq, &iov[1], &iov_n);
	    if (mpi_errno == MPI_SUCCESS)
	    {
		iov_n += 1;
		
		MPIDI_VC_FAI_send_seqnum(vc, seqnum);
		MPIDI_Pkt_set_seqnum(es_pkt, seqnum);
		MPIDI_Request_set_seqnum(sreq, seqnum);
		
		if (sreq->dev.ca != MPIDI_CH3_CA_COMPLETE)
		{
		    /* sreq->dev.datatype_ptr = dt_ptr;
		       MPID_Datatype_add_ref(dt_ptr); -- not needed for blocking operations */
		}

		mpi_errno = MPIDI_CH3_iSendv(vc, sreq, iov, iov_n);
		/* --BEGIN ERROR HANDLING-- */
		if (mpi_errno != MPI_SUCCESS)
		{
		    MPIU_Object_set_ref(sreq, 0);
		    MPIDI_CH3_Request_destroy(sreq);
		    sreq = NULL;
		    mpi_errno = MPIR_Err_create_code(mpi_errno, MPIR_ERR_FATAL, FCNAME, __LINE__, MPI_ERR_OTHER, "**ch3|eagermsg", 0);
		    goto fn_exit;
		}
		/* --END ERROR HANDLING-- */
	    }
	    else
	    {
		/* --BEGIN ERROR HANDLING-- */
		MPIU_Object_set_ref(sreq, 0);
		MPIDI_CH3_Request_destroy(sreq);
		sreq = NULL;
		mpi_errno = MPIR_Err_create_code(mpi_errno, MPIR_ERR_RECOVERABLE, FCNAME, __LINE__, MPI_ERR_OTHER, "**ch3|loadsendiov", 0);
		goto fn_exit;
		/* --END ERROR HANDLING-- */
	    }
	}
    }
    else
    {
	MPIDI_CH3_Pkt_t upkt;
	MPIDI_CH3_Pkt_rndv_req_to_send_t * const rts_pkt = &upkt.rndv_req_to_send;
#ifndef MPIDI_CH3_CHANNEL_RNDV
	MPID_Request * rts_sreq;
#endif
	
	MPIDI_DBG_PRINTF((15, FCNAME, "sending rndv RTS, data_sz=" MPIDI_MSG_SZ_FMT, data_sz));
	    
	sreq->partner_request = NULL;
	
	MPIDI_Pkt_init(rts_pkt, MPIDI_CH3_PKT_RNDV_REQ_TO_SEND);
	rts_pkt->match.rank = comm->rank;
	rts_pkt->match.tag = tag;
	rts_pkt->match.context_id = comm->context_id + context_offset;
	rts_pkt->sender_req_id = sreq->handle;
	rts_pkt->data_sz = data_sz;

	MPIDI_VC_FAI_send_seqnum(vc, seqnum);
	MPIDI_Pkt_set_seqnum(rts_pkt, seqnum);
	MPIDI_Request_set_seqnum(sreq, seqnum);

#ifdef MPIDI_CH3_CHANNEL_RNDV

	MPIDI_DBG_PRINTF((30, FCNAME, "Rendezvous send using iStartRndvMsg"));
    
	if (dt_contig) 
	{
	    MPIDI_DBG_PRINTF((30, FCNAME, "  contiguous rndv data, data_sz="
			      MPIDI_MSG_SZ_FMT, data_sz));
		
	    sreq->dev.ca = MPIDI_CH3_CA_COMPLETE;
	    
	    sreq->dev.iov[0].MPID_IOV_BUF = (MPID_IOV_BUF_CAST) ((char*)sreq->dev.user_buf + dt_true_lb);
	    sreq->dev.iov[0].MPID_IOV_LEN = data_sz;
	    sreq->dev.iov_count = 1;
	}
	else
	{
	    MPID_Segment_init(sreq->dev.user_buf, sreq->dev.user_count,
			      sreq->dev.datatype, &sreq->dev.segment, 0);
	    sreq->dev.iov_count = MPID_IOV_LIMIT;
	    sreq->dev.segment_first = 0;
	    sreq->dev.segment_size = data_sz;
	    mpi_errno = MPIDI_CH3U_Request_load_send_iov(sreq, &sreq->dev.iov[0],
							 &sreq->dev.iov_count);
	    /* --BEGIN ERROR HANDLING-- */
	    if (mpi_errno != MPI_SUCCESS)
	    {
		mpi_errno = MPIR_Err_create_code(mpi_errno, MPIR_ERR_FATAL,
						 FCNAME, __LINE__, MPI_ERR_OTHER,
						 "**ch3|loadsendiov", 0);
		goto fn_exit;
	    }
	    /* --END ERROR HANDLING-- */
	}
	mpi_errno = MPIDI_CH3_iStartRndvMsg (vc, sreq, &upkt);
	/* --BEGIN ERROR HANDLING-- */
	if (mpi_errno != MPI_SUCCESS)
	{
	    MPIU_Object_set_ref(sreq, 0);
	    MPIDI_CH3_Request_destroy(sreq);
	    sreq = NULL;
	    mpi_errno = MPIR_Err_create_code(mpi_errno, MPIR_ERR_FATAL,
					     FCNAME, __LINE__, MPI_ERR_OTHER,
					     "**ch3|rtspkt", 0);
	    goto fn_exit;
	}
	/* --END ERROR HANDLING-- */
	
#else
	mpi_errno = MPIDI_CH3_iStartMsg(vc, rts_pkt, sizeof(*rts_pkt), &rts_sreq);
	/* --BEGIN ERROR HANDLING-- */
	if (mpi_errno != MPI_SUCCESS)
	{
	    MPIU_Object_set_ref(sreq, 0);
	    MPIDI_CH3_Request_destroy(sreq);
	    sreq = NULL;
	    mpi_errno = MPIR_Err_create_code(mpi_errno, MPIR_ERR_FATAL, FCNAME, __LINE__, MPI_ERR_OTHER, "**ch3|rtspkt", 0);
	    goto fn_exit;
	}
	/* --END ERROR HANDLING-- */
	if (rts_sreq != NULL)
	{
	    if (rts_sreq->status.MPI_ERROR != MPI_SUCCESS)
	    {
		MPIU_Object_set_ref(sreq, 0);
		MPIDI_CH3_Request_destroy(sreq);
		sreq = NULL;
		mpi_errno = MPIR_Err_create_code(rts_sreq->status.MPI_ERROR, MPIR_ERR_FATAL, FCNAME, __LINE__, MPI_ERR_OTHER, "**ch3|rtspkt", 0);
		MPID_Request_release(rts_sreq);
		goto fn_exit;
	    }
	    MPID_Request_release(rts_sreq);
	}
#endif
	/* FIXME: fill temporary IOV or pack temporary buffer after send to hide some latency.  This requires synchronization
           because the CTS packet could arrive and be processed before the above iStartmsg completes (depending on the progress
           engine, threads, etc.). */
	
	if (dt_ptr != NULL)
	{
	    /* sreq->dev.datatype_ptr = dt_ptr;
	       MPID_Datatype_add_ref(dt_ptr); -- not needed for blocking operations */
	}
    }

  fn_exit:
    *request = sreq;
    
#   ifdef MPICH_DBG_OUTPUT
    {
	if (sreq != NULL)
	{
	    MPIDI_DBG_PRINTF((15, FCNAME, "request allocated, handle=0x%08x", sreq->handle));
	}
    }
#   endif
    
    MPIDI_DBG_PRINTF((10, FCNAME, "exiting"));
    MPIDI_FUNC_EXIT(MPID_STATE_MPID_SSEND);
    return mpi_errno;
}