Hello Ayaz,
Thank you for your response! 😊
I am trying to checkpoint with Atomic then restore to atomic and switch to
Timing/O3.
Your advice works if I checkpoint with this and also with Timing, then restore
with Timing and switch, thank you.
From my knowledge the way to switch CPUs in stdlib is to use m5 exit, and to
override the exit event with a cpu switch.
Or to do the same from a bootscript.
Is there a way to delay the switch in gem5 so that its not immediately after a
boot (when I checkpoint).
I have tried:
"m5 checkpoint; m5 exit [10000000000]; "
To delay exit event by 10000000000 cycles. (also have tried without square
brackets).
But this returns that my usage of m5 commands is incorrect.
Also I assume switching multiple times between different CPUs will require a
new script based off of SimpleSwitchableProcessor
Kind regards,
Abdal
From: Ayaz Akram <yazak...@ucdavis.edu>
Sent: Tuesday, June 20, 2023 8:11 PM
To: The gem5 Users mailing list <gem5-users@gem5.org>
Cc: AbdelQader AlKilany <abdelqader.alkil...@huawei.com>
Subject: Re: [gem5-users] Simple Switchable Processor with checkpoint
restoration
Hi Abdal,
Assuming that you run into this problem when using different start and switch
core types for SimpleSwitchable processor in your script, I think the main
problem is that on restore the start core type is not the same as the core with
which you took the checkpoint (which I am assuming was the switch core type,
let me know if that is not the case). I think you can restore your checkpoint
using SimpleProcessor as well. However, in that case if you want to switch
again after restoring you would not be able to do so. Another solution/option
is to create a new class that inherits from SimpleSwitchableProcessor in which
you just swap the start and switch keys, for example some thing like following:
self._start_key = "switch"
self._switch_key = "start"
And then use this new processor type in your restore script. This way you will
restore with the correct CPU type and if you want to switch to a different CPU
type you can do that as well.
-Ayaz
On Mon, Jun 19, 2023 at 11:45 AM AbdelQader AlKilany via gem5-users
<gem5-users@gem5.org<mailto:gem5-users@gem5.org>> wrote:
Hello gem5 users,
I was having some trouble trying to restore a simulation from a checkpoint when
using a stdlib switchable processor (SimpleSwitchableProcessor).
When I would attempt to run a simulation like this the simulation would freeze
up and not restore the checkpoint at all.
I was wondering whether this functionality had been implemented yet or whether
there was another way to achieve this using by adding to one of the processor
or configuration scripts.
The only difference I could find between SwitchableProcessor and
SimpleProcessor (which restored checkpoints fine) was that the former inherits
directly from AbstractProcessor and the latter inherits from BaseCPUProcessor
so I thought some functionality may have been added to BaseCPUProcessor which
wasn’t available in AbstractProcessor alone.
Thank you for any help! 😊
Kind Regards,
Abdal
_______________________________________________
gem5-users mailing list -- gem5-users@gem5.org<mailto:gem5-users@gem5.org>
To unsubscribe send an email to
gem5-users-le...@gem5.org<mailto:gem5-users-le...@gem5.org>
_______________________________________________
gem5-users mailing list -- gem5-users@gem5.org
To unsubscribe send an email to gem5-users-le...@gem5.org
