dc16c1ceb8
This patch adds the ability for an application to request dist-gem5 to begin/ end synchronization using an m5 op. When toggling on sync, all nodes agree on the next sync point based on the maximum of all nodes' ticks. CPUs are suspended until the sync point to avoid sending network messages until sync has been enabled. Toggling off sync acts like a global execution barrier, where all CPUs are disabled until every node reaches the toggle off point. This avoids tricky situations such as one node hitting a toggle off followed by a toggle on before the other nodes hit the first toggle off.
114 lines
4 KiB
C++
114 lines
4 KiB
C++
/*
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* Copyright (c) 2015 ARM Limited
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* All rights reserved
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*
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* The license below extends only to copyright in the software and shall
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* not be construed as granting a license to any other intellectual
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* property including but not limited to intellectual property relating
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* to a hardware implementation of the functionality of the software
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* licensed hereunder. You may use the software subject to the license
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* terms below provided that you ensure that this notice is replicated
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* unmodified and in its entirety in all distributions of the software,
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* modified or unmodified, in source code or in binary form.
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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: Gabor Dozsa
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*/
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/* @file
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* Header packet class for dist-gem5 runs.
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*
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* For a high level description about dist-gem5 see comments in
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* header file dist_iface.hh.
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*
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* The DistHeaderPkt class defines the format of message headers
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* sent among gem5 processes during a dist gem5 simulation. A header packet
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* can either carry the description of data packet (i.e. a simulated Ethernet
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* packet) or a synchronisation related control command. In case of
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* data packet description, the corresponding data packet always follows
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* the header packet back-to-back.
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*/
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#ifndef __DEV_DIST_PACKET_HH__
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#define __DEV_DIST_PACKET_HH__
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#include <cstring>
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#include "base/types.hh"
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class DistHeaderPkt
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{
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private:
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DistHeaderPkt() {}
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~DistHeaderPkt() {}
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public:
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enum class ReqType { immediate, collective, pending, none };
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/**
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* The msg type defines what information a dist header packet carries.
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*/
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enum class MsgType
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{
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dataDescriptor,
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cmdSyncReq,
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cmdSyncAck,
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unknown
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};
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struct Header
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{
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/**
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* The msg type field is valid for all header packets.
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*
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* @note senderRank is used with data packets while collFlags are used
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* by sync ack messages to trigger collective ckpt or exit events.
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*/
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MsgType msgType;
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Tick sendTick;
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/**
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* Length used for modeling timing in the simulator.
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* (from EthPacketData::simLength).
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*/
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unsigned simLength;
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union {
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Tick sendDelay;
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Tick syncRepeat;
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};
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union {
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/**
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* Actual length of the simulated Ethernet packet.
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* (from EthPacketData::length).
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*/
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unsigned dataPacketLength;
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struct {
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ReqType needCkpt;
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ReqType needStopSync;
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ReqType needExit;
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};
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};
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};
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};
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#endif
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