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/*
* Copyright (c) 2001-2003 The Trustees of Indiana University.
* All rights reserved.
* Copyright (c) 1998-2001 University of Notre Dame.
* All rights reserved.
* Copyright (c) 1994-1998 The Ohio State University.
* All rights reserved.
*
* This file is part of the LAM/MPI software package. For license
* information, see the LICENSE file in the top level directory of the
* LAM/MPI source distribution.
*
* $HEADER$
*
* $Id: local_req.cc,v 1.18 2003/02/04 17:51:30 jsquyres Exp $
*
* Function: - maintains the MPI_Requests and associated data
* for messages from IMPI hosts to the local LAM
* - when msg comes from an IMPI host, do an MPI_Isend
* - save the MPI_Request in an STL list
* - do an MPI_Test loop; then prune completed requests
* out of the STL list
* - when pruning, may need to queue up an SYNC ACK
* IMPI_Packet on the appropriate outgoing host queue
*/
#include <lam_config.h>
#if LAM_WANT_IMPI
#include <iostream>
#include <impi.h>
#include <req_mgmt.h>
#include <lamdebug-cc.h>
using std::list;
using std::cerr;
using std::endl;
/*
* private variables
*/
typedef list<req_mgmt*> local_requests_list;
static local_requests_list req_list;
static Debug debug(false);
/*
* local_req_send
*
* Function: - send a message to a local LAM rank
* - must calculate local LAM rank number from message
* header (pk_src)
* - do MPI_Isend to send message to LAM
* - insert MPI_Request and ptr to SYNCACK packet in
* list of pending requests to LAM
*
* Accepts: - ptr to IMPI_Packet header of message
* - ptr to data buffer
* - ptr to a SYNCACK IMPI_Packet that will be sent
* when this message is actually received by the
* LAM rank (or 0 if there is no syncack)
*
* Returns: - 0 on success, LAMERROR on failure
*/
int
local_req_send(IMPI_Packet* pk, char* buffer, MPI_Datatype type,
IMPI_Packet* syncack)
{
MPI_Request req;
//
// ***** WARNING *****
//
// Putting in the proc_resolver(&pk->pk_src) for the dest rank will
// only work right now because the impid knows about the
// communicator that it is being sent on, MPI_COMM_WORLD. Once
// collectives are put into IMPI, it is likely that the impid will
// need to become aware of all the communicators in LAM (i.e.,
// participate in all the communicator constructors). Then we can
// lookup ranks in arbitrary [local] communicators.
//
// The issue is for the LAM progression engine (at least the C2C
// engine) -- an MPI_Ssend (or MPI_Issend) will send an ACK back
// deep within the progression engine. The destination rank will
// put its rank number in the ACK (relative to the CID that it was
// sent on), which the impid's progression engine will not
// understand (since we don't know that the destination's rank is in
// the target cid).
//
// We can currently forge it properly only because without
// collectives, there is only one communicator: MPI_COMM_WORLD, so
// the impid essentially can lookup the destination rank in the
// target communicator. This will change when the collectives are
// put in and more communicators (within an IMPI job) are possible.
int dest_rank = proc_resolver(&pk->pk_dest);
MPI_Comm comm = comm_make(pk->pk_cid, pk->pk_lsrank,
dest_rank,
proc_resolver(&pk->pk_dest));
// post the send to the lam node
debug << "local_req_send: sending to LAM: src rank " << pk->pk_lsrank
<< " dest rank " << dest_rank
<< " dest world rank " << proc_resolver(&pk->pk_dest)
<< " msglen " << pk->pk_msglen
<< " tag " << pk->pk_tag
<< " cid " << (int) pk->pk_cid << endl;
if (MPI_Isend(buffer, pk->pk_msglen, type, dest_rank,
pk->pk_tag, comm, &req) != MPI_SUCCESS) {
cerr << "LAM IMPI host was not able to send to the local LAM" << endl;
impi_bail(1);
}
// make request_mgmt with the req and the corresponding syncack and
// insert it into the list
req_mgmt *lrs = new req_mgmt(buffer, req, syncack, comm);
req_list.push_back(lrs);
return 0;
}
/*
* local_test
*
* Function: - loop over the list of requests outstanding and
* do MPI_Test on each
* - if the send completed, enque the syncack pk
* Accepts: - list of local requests
*
* Returns: - 0 on success, LAMERROR on failure
*/
int
local_test()
{
// Short circuit optimization; if we have nothing to wait for, just
// return
if (req_list.empty())
return 0;
int flag;
IMPI_Packet *pk;
MPI_Status status;
local_requests_list::iterator i, prev;
static unsigned int last = 0;
if (last != req_list.size()) {
debug << "Checking " << req_list.size() << " pending MPI_Requests" << endl;
last = req_list.size();
}
for (prev = req_list.end(), i = req_list.begin(); i != req_list.end(); i++) {
if (prev != req_list.end())
req_list.erase(prev);
MPI_Test((*i)->get_req(), &flag, &status);
if (flag) {
debug << "A send to the local LAM has finished" << endl;
// Error check
if (status.MPI_ERROR != MPI_SUCCESS) {
cerr << "LAM IMPI host discovered an error sending to the local LAM"
<< endl;
impi_bail(1);
}
// the send has completed so send the syncack to the host
pk = (*i)->get_packet();
if (pk != 0) {
debug << "Sending some SYNCACK back to MCW rank "
<< proc_resolver(&pk->pk_dest) << endl;
host_enque_packet(pk, (char *) 0,
lam_impi_procs[proc_resolver(&(pk->pk_dest))].ip_hostrank);
}
// Free the fake comm used for the isend, and the (req_mgmt*)
comm_free((*i)->get_comm());
delete (*i);
// per STL reference guide pg. 144 erasing i++ is fine
prev = i;
} else
prev = req_list.end();
}
if (prev != req_list.end())
req_list.erase(prev);
if (last != req_list.size()) {
debug << req_list.size() << " MPI_Requests still pending" << endl;
last = req_list.size();
}
return 0;
}
#endif
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