dev: add support for multi gem5 runs
authorGabor Dozsa <gabor.dozsa@arm.com>
Thu, 16 Jul 2015 00:53:50 +0000 (19:53 -0500)
committerGabor Dozsa <gabor.dozsa@arm.com>
Thu, 16 Jul 2015 00:53:50 +0000 (19:53 -0500)
commitfc5bf6713f191047e07f33a788d099b2bbd9faf4
treea6af111bc06faaf3bd98a6b6ede0af6b6ff0ab2f
parent541066091949dc91e07874c262b0b5b740718d01
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).
17 files changed:
src/dev/Ethernet.py
src/dev/SConscript
src/dev/etherpkt.cc
src/dev/etherpkt.hh
src/dev/multi_etherlink.cc [new file with mode: 0644]
src/dev/multi_etherlink.hh [new file with mode: 0644]
src/dev/multi_iface.cc [new file with mode: 0644]
src/dev/multi_iface.hh [new file with mode: 0644]
src/dev/multi_packet.cc [new file with mode: 0644]
src/dev/multi_packet.hh [new file with mode: 0644]
src/dev/tcp_iface.cc [new file with mode: 0644]
src/dev/tcp_iface.hh [new file with mode: 0644]
util/multi/Makefile [new file with mode: 0644]
util/multi/bootscript.rcS [new file with mode: 0644]
util/multi/gem5-multi.sh [new file with mode: 0755]
util/multi/tcp_server.cc [new file with mode: 0644]
util/multi/tcp_server.hh [new file with mode: 0644]