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authorGabor Dozsa <gabor.dozsa@arm.com>2015-07-15 19:53:50 -0500
committerGabor Dozsa <gabor.dozsa@arm.com>2015-07-15 19:53:50 -0500
commitfc5bf6713f191047e07f33a788d099b2bbd9faf4 (patch)
treea6af111bc06faaf3bd98a6b6ede0af6b6ff0ab2f /src/arch/x86/decoder.cc
parent541066091949dc91e07874c262b0b5b740718d01 (diff)
downloadgem5-fc5bf6713f191047e07f33a788d099b2bbd9faf4.tar.xz
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).
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