With Ruby, you can checkpoint only when MOESI hammer protocol is in use.
--
Nilay
On Sun, 25 Mar 2012, Fengkai Yuan wrote:
Hi there
I wonder that the command 'm5 checkpoint' does not work for a
Alpha Ruby full system simulation!
After I boot up a RUBY model ALPHA full system successfully, I use
the command 'm5 checkpoint' in the sell of the simulated system, I
encounter a RUNTIME ERROR below and the simulation fails.
Runtime Error at MESI_CMP_directory-L1cache.sm:221, Ruby Time: 23014921238:
Invalid RubyRequestType, PID...
I check the .sm file above and I found the function below:
Event mandatory_request_type_to_event(RubyRequestType type) {
if (type == RubyRequestType:LD) {
return Event:Load;
} else if (type == RubyRequestType:IFETCH) {
return Event:Ifetch;
} else if ((type == RubyRequestType:ST) || (type ==
RubyRequestType:ATOMIC)) {
return Event:Store;
} else {
error("Invalid RubyRequestType"); ***** HERE is the LINE 221
********
}
}
I guess this is because CPU send wrong type RubyRequest messages
to L1 caches when we run RUBY model checkpointing.
I also tried fs.py (non-Ruby) and the 'm5 checkpoint' works well.
Does it mean we can not take checkpoint with the ruby model full system?
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