From fc5bf6713f191047e07f33a788d099b2bbd9faf4 Mon Sep 17 00:00:00 2001 From: Gabor Dozsa Date: Wed, 15 Jul 2015 19:53:50 -0500 Subject: dev: add support for multi gem5 runs 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). --- src/dev/multi_packet.cc | 100 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 100 insertions(+) create mode 100644 src/dev/multi_packet.cc (limited to 'src/dev/multi_packet.cc') diff --git a/src/dev/multi_packet.cc b/src/dev/multi_packet.cc new file mode 100644 index 000000000..1fd0c0e81 --- /dev/null +++ b/src/dev/multi_packet.cc @@ -0,0 +1,100 @@ +/* + * Copyright (c) 2015 ARM Limited + * All rights reserved + * + * The license below extends only to copyright in the software and shall + * not be construed as granting a license to any other intellectual + * property including but not limited to intellectual property relating + * to a hardware implementation of the functionality of the software + * licensed hereunder. You may use the software subject to the license + * terms below provided that you ensure that this notice is replicated + * unmodified and in its entirety in all distributions of the software, + * modified or unmodified, in source code or in binary form. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Gabor Dozsa + */ + +/* @file + * MultiHeaderPkt class to encapsulate multi-gem5 header packets + * + */ + +#include "dev/multi_packet.hh" + +#include +#include + +#include "base/inet.hh" + +unsigned +MultiHeaderPkt::maxAddressLength() +{ + return sizeof(AddressType); +} + +void +MultiHeaderPkt::clearAddress(AddressType &addr) +{ + std::memset(addr, 0, sizeof(addr)); +} + +bool +MultiHeaderPkt::isAddressEqual(const AddressType &addr1, + const AddressType &addr2) +{ + return (std::memcmp(addr1, addr2, sizeof(addr1)) == 0); +} + +bool +MultiHeaderPkt::isAddressLess(const AddressType &addr1, + const AddressType &addr2) +{ + return (std::memcmp(addr1, addr2, sizeof(addr1)) < 0); +} + +void +MultiHeaderPkt::copyAddress(AddressType &dest, const AddressType &src) +{ + std::memcpy(dest, src, sizeof(dest)); +} + +bool +MultiHeaderPkt::isBroadcastAddress(const AddressType &addr) +{ + return ((Net::EthAddr *)&addr)->broadcast(); +} + +bool +MultiHeaderPkt::isMulticastAddress(const AddressType &addr) +{ + return ((Net::EthAddr *)&addr)->multicast(); +} + +bool +MultiHeaderPkt::isUnicastAddress(const AddressType &addr) +{ + return ((Net::EthAddr *)&addr)->unicast(); +} -- cgit v1.2.3