Thanks for the response. I was wondering if you could expand a bit upon exactly where to attach the child cpu list (possibly by just providing a sample configuration file that uses the swithCpu). I've tried attaching it at both the root level, and at the system level; but the problem is m5 dies with the error that there is no such parameter at that level ( e.g. "AttributeError: Class Root has no parameter cpuList"). I've looked through the root and system objects and can't find any parameter associated with such a list. I also tried declaring a vector of cpus instead of just one ( e.g. root.system.cpu = [cpu,cpu2]) to see if I could get it to instantiate that way, but that usually ends in an error such as "AttributeError: parent.any matched more than one:". Finally, I've also tried creating multiple systems ( root.testdsys and root.drivesys), but I don't think that is giving me what I desire.
I'm still pretty new to Python so I apologize if there is a simple way to look this up and I am just overlooking it, but as of this moment I'm at a lost for how to solve this issue.
James
I believe the problem here is that cpu and cpu2 need to be part of the system (somewhere) in order to be instantiated by m5's configuration parsing. The error that it's giving you means that you didn't have those two CPUs as part of the configuration that actually gets instantiated. Thus when it tries to switch between the CPUs, it finds that the CPUs have no corresponding object within the running instance of m5. Try making your switch_cpu_list as a child of either the root object or a system object (I believe you should just be able to do "root.switch_cpus = switch_cpu_list" or something along those lines). I'll try to clean up the Wiki to clarify that when I get a better example.
Kevin
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of James Anon
Sent: Friday, September 01, 2006 2:35 PM
To: [email protected]
Subject: [m5-users] Using the SwitchCpu function
I am trying to use the m5.switchCpus function to quickly simulate pass the linux booting stage, and then switch to detailed mode after the full system is booted. I followed the wiki page and have made minor modifications to the fs.py example script including:
cpu = AtomicSimpleCPU()
cpu2 = DetailedO3CPU()
mem_mode = 'timing'
.
.
.
switch_cpu_list = [(cpu,cpu2)]
m5.simulate(3663496423522)
m5.switchCpus(switch_cpu_list)
exit_event = m5.simulate(maxtick)
Most other options I've left the same from the fs.py script, but when I run the simulator, it works perfectly until the switch point and then dies with:
Switching CPUs
Traceback (most recent call last):
File "<string>", line 1, in ?
File "build/ALPHA_FS/python/m5/main.py", line 314, in main
execfile(sys.argv[0], scope)
File "configs/example/fsSwap.py", line 86, in ?
m5.switchCpus(switch_cpu_list)
File "build/ALPHA_FS/python/m5/__init__.py", line 206, in switchCpus
new_cpu.takeOverFrom(old_cpus[index])
File "build/ALPHA_FS/python/m5/config.py", line 570, in takeOverFrom
self._ccObject.takeOverFrom(cpu_ptr)
AttributeError: 'NoneType' object has no attribute 'takeOverFrom'
Is there something I'm forgetting to instantiate? Any help would be greatly appreciate.
Ps. Thanks for setting up the WIKI page. It has been a tremendous help, and in my opinion a great improvement over the documentation that was available for the previous version of m5. I hope the community continues to add to it!
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