Hi Everyone,
I'm setting M5 up for a research project, and I'm having issues with
sampling. I would like to be able to switch back and forth between
TimingSimpleCPU and AtomicSimpleCPU on command. My simulation script
is included at the end. I can switch from timing to atomic with no
problem, but after switching back to timing, nothing happens (tracing
the bus confirms that there is no activity). If I switch back to
atomic (using the script), bus activity resumes and simulation
continues. I am running on Ubuntu (2.6.27-9 kernel, gcc 4.3.2) using
the ALPHA_FS target.
Please advise!
Thanks!
-David
Here is sample output:
$ build/ALPHA_FS/m5.opt dmp.py
M5 Simulator System
Copyright (c) 2001-2008
The Regents of The University of Michigan
All Rights Reserved
M5 compiled Dec 27 2008 05:42:19
M5 revision 5780:50c9d48de3caa629a27408bf5f3423656ae15da1
M5 commit date Wed Dec 17 09:51:18 2008 -0800
M5 started Dec 29 2008 20:46:14
M5 executing on calvin.eecs.umich.edu
command line: build/ALPHA_FS/m5.opt dmp.py
Global frequency set at 1000000000000 ticks per second
warn: kernel located at: /n/poolfs/z/dist/m5/system/binaries/vmlinux
Listening for system connection on port 3456
0: switch_cpus.system.tsunami.io.rtc: Real-time clock set to
Thu Jan 1 00:00:00 2009
0: switch_cpus.system.remote_gdb.listener: listening for remote gdb #0
on port 7000
**** REAL SIMULATION ****
info: Entering event queue @ 0. Starting simulation...
651374031000: switch_cpus.system.terminal: attach terminal 0
warn: be nice to actually delete the event here
Simulator exited @ 4116076212000. Cause: checkpoint
info: Entering event queue @ 4116076212000. Starting simulation...
info: Entering event queue @ 4116076242000. Starting simulation...
Changing memory mode to atomic
switching cpus
info: Entering event queue @ 4116076244000. Starting simulation...
Simulator exited @ 4116426040000. Cause: checkpoint
Changing memory mode to timing
switching cpus
info: Entering event queue @ 4116426040000. Starting simulation...
[never continues past this point]
---------------------------------------------------------------------------------------------------------
Sample terminal output:
[... Linux booting]
VFS: Mounted root (ext2 filesystem) readonly.
Freeing unused kernel memory: 224k freed
init started: BusyBox v1.1.0 (2007.03.04-01:07+0000) multi-call binary
mounting filesystems...
EXT2-fs warning: checktime reached, running e2fsck is recommended
loading script...
[never continues past this point]
---------------------------------------------------------------------------------------------------------
Command-line script:
m5 checkpoint
m5 checkpoint
[never continues past this point]
ls
bash
---------------------------------------------------------------------------------------------------------
Python script:
import optparse, os, sys
import m5
if not m5.build_env['FULL_SYSTEM']:
m5.panic("This script requires full-system mode (*_FS).")
from os import getcwd
from m5.objects import *
m5.AddToPath('configs/common')
from FSConfig import *
from SysPaths import *
from Benchmarks import *
import Simulation
from Caches import *
from os.path import isdir, exists
from os import listdir
import re
def switchList(num_cpus, system, current_cpus, switchType):
if current_cpus == None:
deferReg = False
sys = Parent.any
else:
deferReg = True
sys = system
if switchType == 'atomic':
switchType = AtomicSimpleCPU
elif switchType == 'timing':
switchType = TimingSimpleCPU
elif switchType == 'o3':
switchType = DerivO3CPU
else:
raise TypeError, "Invalid CPU type."
switch_cpus =
[switchType(cpu_id=i,defer_registration=deferReg,system=sys) \
for i in xrange(num_cpus)]
return switch_cpus
# Get paths we might need. It's expected this file is in m5/configs/
example.
config_path = os.path.dirname(os.path.abspath(__file__))
config_root = config_path+"/configs";
parser = optparse.OptionParser()
execfile(os.path.join(config_root, "common", "Options.py"))
(options, args) = parser.parse_args()
if args:
print "Error: script doesn't take any positional arguments"
sys.exit(1)
# checkpoint directory
cptdir = getcwd()
# Run options
num_cpus = 1
cpt_num = 1
TimingSimpleCPU.clock = '2GHz'
bm = [SysConfig()]
sys = makeLinuxAlphaSystem('timing', bm[0])
sys.kernel = binary("vmlinux")
sys.readfile = "dmp.sh"
detailed_cpus = checkpoint_cpus = []
detailed_cpus = switchList(num_cpus, sys, None, 'timing')
checkpoint_cpus = switchList(num_cpus, sys, detailed_cpus, 'atomic')
switch_cpu_list = [(detailed_cpus[i], checkpoint_cpus[i]) \
for i in xrange(num_cpus)]
sys.cpu = detailed_cpus
for i in xrange(num_cpus):
sys.cpu[i].connectMemPorts(sys.membus)
checkpoint_cpus[i].clock = sys.cpu[0].clock
root = Root(system=sys)
root.switch_cpus = checkpoint_cpus
m5.instantiate(root)
print "**** REAL SIMULATION ****"
while True:
exit_event = m5.simulate()
print "Simulator exited @ %d. Cause: %s" % (m5.curTick(),
exit_event.getCause())
if exit_event.getCause() == "user interrupt received" or \
exit_event.getCause() == "m5_exit instruction encountered":
break
elif exit_event.getCause() == "checkpoint":
if sys.getMemoryMode() == m5.objects.params.atomic:
for i in xrange(num_cpus):
m5.doDrain(checkpoint_cpus[i])
m5.changeToTiming(sys)
m5.switchCpus(switch_cpu_list)
m5.resume(sys)
checkpoint_cpus = switchList(num_cpus, sys,
detailed_cpus, 'atomic')
root.switch_cpus = checkpoint_cpus
for i in xrange(num_cpus):
root.switch_cpus[i].getCCObject() # initialize SWIG
object
switch_cpu_list = [(detailed_cpus[i], checkpoint_cpus[i]) \
for i in xrange(num_cpus)]
else:
for i in xrange(num_cpus):
m5.doDrain(detailed_cpus[i])
m5.changeToAtomic(sys)
m5.switchCpus(switch_cpu_list)
m5.resume(sys)
detailed_cpus = switchList(num_cpus, sys,
checkpoint_cpus, 'timing')
root.switch_cpus = detailed_cpus
for i in xrange(num_cpus):
root.switch_cpus[i].getCCObject() # initialize SWIG
object
switch_cpu_list = [(checkpoint_cpus[i], detailed_cpus[i]) \
for i in xrange(num_cpus)]
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