Hi James,
Sorry for the slow response. I’ve
had some pretty big deadlines due recently, so I’ve been very busy with
that.
I looked at a config I had working a while
ago for sampling and I updated the Wiki with the information from it.
Basically you should be able to assign the CPU you will switch in as a child of
the system that it will run in once it is switched in. So if you had an
instantiation of System called my_system, you should be able to do
my_system.switch_cpu = my_switch_cpu. In this case you’re not actually
setting a parameter within System, but merely indicating that it has a child
object switch_cpu.
Hopefully this helps,
Kevin
From:
[EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of James Anon
Sent: Tuesday, September 05, 2006
4:07 PM
To: M5 users mailing list
Subject: Re: [m5-users] Using the
SwitchCpu function
Hi Kevin,
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
On 9/3/06, Kevin Lim
<[EMAIL PROTECTED]> wrote:
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
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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