Hey Hossam,

A better API for setting max number of instructions via the Simulator
module will be coming in v22.1, but in the meantime you can do something
like:

processor.get_cores()[0].get_simobject().max_insts_any_thread = <max insts>

With the above, the simulation will exit when any thread on the first core
reaches the max number of threads.

--
Dr. Bobby R. Bruce
Room 3050,
Kemper Hall, UC Davis
Davis,
CA, 95616

web: https://www.bobbybruce.net

On Thu, Sep 15, 2022 at 9:31 AM Hossam ElAtali hossam.elatali@uwaterloo.ca
wrote:

Setting “maxinsts” causes the cpus’ max_insts_any_thread variable to be
set. However, I’m currently using the board and Simulator style of creating
the run scripts so these variables aren’t exposed in the processor object I
give to the board. I’ve been going around the code base and trying out
different ways to set max_insts_any_thread but I always end up with “ … has
no parameter max_insts_any_thread”. Any ideas? Thank you.

Hi Dr. Bruce,

Thanks a lot for the reply.

Setting the variable this way works, but only if I set it before the simulation starts completely. I looked at the source code and it seems max_insts_any_thread is only used to schedule an exit event in the BaseCPU::init() function. I’m guessing this is only called once at the very beginning. Is there a way to set the max instruction count when the simulation has exited (e.g., due to an m5 exit instruction) so that it runs for n instructions after this point?

Best regards,
Hossam

From: Bobby Bruce bbruce@ucdavis.edu
Sent: Thursday, September 15, 2022 2:43 PM
To: The gem5 Users mailing list gem5-users@gem5.org
Subject: [gem5-users] Re: Set max number of instructions to simulate using Board+Simulator API

Hey Hossam,

A better API for setting max number of instructions via the Simulator module will be coming in v22.1, but in the meantime you can do something like:

processor.get_cores()[0].get_simobject().max_insts_any_thread = <max insts>

With the above, the simulation will exit when any thread on the first core reaches the max number of threads.

--
Dr. Bobby R. Bruce
Room 3050,
Kemper Hall, UC Davis
Davis,
CA, 95616

web: https://www.bobbybruce.net

On Thu, Sep 15, 2022 at 9:31 AM Hossam ElAtali <hossam.elatali@uwaterloo.camailto:hossam.elatali@uwaterloo.ca> wrote:

I believe there is a way to do this after the simulation has instantiated.
You can schedule a stop on a core like so:

processor.cores[0].core.scheduleInstStop(0, 100, "m5_workbegin instruction
encountered")

which will schedule a "workbegin" exit event after 100 instructions in core
0.

While not available on the stable branch just yet, we are working on
exposing this in a more clean way via the stdlib on the develop branch:
https://gem5-review.googlesource.com/c/public/gem5/+/63153. You could
cherry pick this patch and use the API created here.

--
Dr. Bobby R. Bruce
Room 3050,
Kemper Hall, UC Davis
Davis,
CA, 95616

web: https://www.bobbybruce.net

On Mon, Sep 26, 2022 at 10:09 AM Hossam ElAtali hossam.elatali@uwaterloo.ca
wrote:

simulation starts completely. I looked at the source code and it seems
max_insts_any_thread is only used to schedule an exit event in the
BaseCPU::init() function. I’m guessing this is only called once at the very
beginning. Is there a way to set the max instruction count when the
simulation has exited (e.g., due to an m5 exit instruction) so that it runs
for n instructions after this point?

using Board+Simulator API

module will be coming in v22.1, but in the meantime you can do something
like:

insts>

core reaches the max number of threads.

hossam.elatali@uwaterloo.ca> wrote:

scripts. Setting “maxinsts” causes the cpus’ max_insts_any_thread variable
to be set. However, I’m currently using the board and Simulator style of
creating the run scripts so these variables aren’t exposed in the processor
object I give to the board. I’ve been going around the code base and trying
out different ways to set max_insts_any_thread but I always end up with “ …
has no parameter max_insts_any_thread”. Any ideas? Thank you.