fc5bf6713f
Multi gem5 is an extension to gem5 to enable parallel simulation of a distributed system (e.g. simulation of a pool of machines connected by Ethernet links). A multi gem5 run consists of seperate gem5 processes running in parallel (potentially on different hosts/slots on a cluster). Each gem5 process executes the simulation of a component of the simulated distributed system (e.g. a multi-core board with an Ethernet NIC). The patch implements the "distributed" Ethernet link device (dev/src/multi_etherlink.[hh.cc]). This device will send/receive (simulated) Ethernet packets to/from peer gem5 processes. The interface to talk to the peer gem5 processes is defined in dev/src/multi_iface.hh and in tcp_iface.hh. There is also a central message server process (util/multi/tcp_server.[hh,cc]) which acts like an Ethernet switch and transfers messages among the gem5 peers. A multi gem5 simulations can be kicked off by the util/multi/gem5-multi.sh wrapper script. Checkpoints are supported by multi-gem5. The checkpoint must be initiated by a single gem5 process. E.g., the gem5 process with rank 0 can take a checkpoint from the bootscript just before it invokes 'mpirun' to launch an MPI test. The message server process will notify all the other peer gem5 processes and make them take a checkpoint, too (after completing a global synchronisation to ensure that there are no inflight messages among gem5).
71 lines
2.6 KiB
C++
71 lines
2.6 KiB
C++
/*
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* Copyright (c) 2004-2005 The Regents of The University of Michigan
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Authors: Nathan Binkert
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*/
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#include <iostream>
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#include "base/misc.hh"
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#include "base/inet.hh"
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#include "dev/etherpkt.hh"
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#include "sim/serialize.hh"
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using namespace std;
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void
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EthPacketData::serialize(const string &base, CheckpointOut &cp) const
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{
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paramOut(cp, base + ".length", length);
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arrayParamOut(cp, base + ".data", data, length);
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}
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void
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EthPacketData::unserialize(const string &base, CheckpointIn &cp)
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{
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paramIn(cp, base + ".length", length);
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if (length)
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arrayParamIn(cp, base + ".data", data, length);
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}
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void
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EthPacketData::packAddress(uint8_t *src_addr,
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uint8_t *dst_addr,
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unsigned &nbytes)
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{
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Net::EthHdr *hdr = (Net::EthHdr *)data;
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assert(hdr->src().size() == hdr->dst().size());
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if (nbytes < hdr->src().size())
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panic("EthPacketData::packAddress() Buffer overflow");
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memcpy(dst_addr, hdr->dst().bytes(), hdr->dst().size());
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memcpy(src_addr, hdr->src().bytes(), hdr->src().size());
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nbytes = hdr->src().size();
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}
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