Creating Checkpoints
Hello All,
I want to create checkpoints after a FS Ubuntu boot up with KVM and then use that checkpoint to run multiple benchmarks with Timing/O3. Right now I am using x86-ubuntu-run-with-kvm.pyhttps://github.com/gem5/gem5/blob/stable/configs/example/gem5_library/x86-ubuntu-run-with-kvm.py script to do that and it successfully boots up and I am able to connect with the m5term to view the process.
I slightly modified the script to add the m5 checkpoint; command, according to thishttps://www.gem5.org/documentation/general_docs/checkpoints/, and it look like this:
command = "m5 exit;"
+ "echo 'This is running on Timing CPU cores.';"
+ "m5 checkpoint;" \ # Save a checkpoint
+ "sleep 1;" \ # Run a benchmark
+ "m5 exit;"
My understanding is that, on the 1st m5 exit it switches from KVM to Timing so I want to get a checkpoint and later run a benchmark. I tried that and I am able to see the echo message but then it terminates. Then I tried to execute the same command trough m5term but still the same result (attach log files)
Kind regards,
Chrysanthos Pepi
You need to explicitly state what you want to do at the "m5 checkpoint"
exit event, otherwise it'll just default to a regular exit.
You'll need to change the "on_exit_event" parameter when constructing the
Simulator. Something like this:
...
def create_checkpoint():
m5.checkpoint("<path to checkpoint>")
simulator = Simulator(
board=board,
on_exit_event={
ExitEvent.EXIT : (func() for func in [processor.switch]),
ExitEvent.CHECKPOINT: (func() for func in [create_checkpoint]),
},
...
Note here we're saying on the first EXIT (m5 exit) exit event we're
switching cores, and on the first CHECKPOINT(m5 checkpoint) exit event
we're creating the checkpoint.
--
Dr. Bobby R. Bruce
Room 3050,
Kemper Hall, UC Davis
Davis,
CA, 95616
web: https://www.bobbybruce.net
On Mon, Sep 5, 2022 at 3:31 PM Chrysanthos Pepi cpepi001@outlook.com
wrote:
Hello All,
I want to create checkpoints after a FS Ubuntu boot up with KVM and then
use that checkpoint to run multiple benchmarks with Timing/O3. Right now I
am using x86-ubuntu-run-with-kvm.py script to do that and it successfully
boots up and I am able to connect with the m5term to view the process.
I slightly modified the script to add the m5 checkpoint; command,
according to this, and it look like this:
command = "m5 exit;" \
+ "echo 'This is running on Timing CPU cores.';" \
+ "m5 checkpoint;" \ # Save a checkpoint
+ "sleep 1;" \ # Run a benchmark
+ "m5 exit;"
My understanding is that, on the 1st m5 exit it switches from KVM to
Timing so I want to get a checkpoint and later run a benchmark. I tried
that and I am able to see the echo message but then it terminates. Then I
tried to execute the same command trough m5term but still the same result
(attach log files)
Kind regards,
Chrysanthos Pepi
gem5-users mailing list -- gem5-users@gem5.org
To unsubscribe send an email to gem5-users-leave@gem5.org
Hi Dr. Bruce,
Thank you for your reply. In order to create checkpoints do I need to use MOESI hammer protocol or classic caches?
Kind regards,
Chrysanthos Pepi
From: Bobby Brucemailto:bbruce@ucdavis.edu
Sent: Tuesday, September 6, 2022 12:46
To: The gem5 Users mailing listmailto:gem5-users@gem5.org
Subject: [gem5-users] Re: Creating Checkpoints
You need to explicitly state what you want to do at the "m5 checkpoint" exit event, otherwise it'll just default to a regular exit.
You'll need to change the "on_exit_event" parameter when constructing the Simulator. Something like this:
...
def create_checkpoint():
m5.checkpoint("<path to checkpoint>")
simulator = Simulator(
board=board,
on_exit_event={
ExitEvent.EXIT : (func() for func in [processor.switch]),
ExitEvent.CHECKPOINT: (func() for func in [create_checkpoint]),
},
...
Note here we're saying on the first EXIT (m5 exit) exit event we're switching cores, and on the first CHECKPOINT(m5 checkpoint) exit event we're creating the checkpoint.
--
Dr. Bobby R. Bruce
Room 3050,
Kemper Hall, UC Davis
Davis,
CA, 95616
web: https://www.bobbybruce.net
On Mon, Sep 5, 2022 at 3:31 PM Chrysanthos Pepi <cpepi001@outlook.commailto:cpepi001@outlook.com> wrote:
Hello All,
I want to create checkpoints after a FS Ubuntu boot up with KVM and then use that checkpoint to run multiple benchmarks with Timing/O3. Right now I am using x86-ubuntu-run-with-kvm.py script to do that and it successfully boots up and I am able to connect with the m5term to view the process.
I slightly modified the script to add the m5 checkpoint; command, according to this, and it look like this:
command = "m5 exit;" \
+ "echo 'This is running on Timing CPU cores.';" \
+ "m5 checkpoint;" \ # Save a checkpoint
+ "sleep 1;" \ # Run a benchmark
+ "m5 exit;"
My understanding is that, on the 1st m5 exit it switches from KVM to Timing so I want to get a checkpoint and later run a benchmark. I tried that and I am able to see the echo message but then it terminates. Then I tried to execute the same command trough m5term but still the same result (attach log files)
Kind regards,
Chrysanthos Pepi
gem5-users mailing list -- gem5-users@gem5.orgmailto:gem5-users@gem5.org
To unsubscribe send an email to gem5-users-leave@gem5.orgmailto:gem5-users-leave@gem5.org
There are two restrictions with Ruby and checkpointing that I'm aware of:
- You have to use MOESI_hammer or another protocol that implements that
flush function. - If you take a checkpoint in Ruby it has to be restored with Ruby.
I don't believe there are any such restrictions with classic caches.
--
Dr. Bobby R. Bruce
Room 3050,
Kemper Hall, UC Davis
Davis,
CA, 95616
web: https://www.bobbybruce.net
On Tue, Sep 6, 2022 at 2:42 PM Chrysanthos Pepi cpepi001@outlook.com
wrote:
Hi Dr. Bruce,
Thank you for your reply. In order to create checkpoints do I need to use
MOESI hammer protocol or classic caches?
Kind regards,
Chrysanthos Pepi
*From: *Bobby Bruce bbruce@ucdavis.edu
*Sent: *Tuesday, September 6, 2022 12:46
*To: *The gem5 Users mailing list gem5-users@gem5.org
*Subject: *[gem5-users] Re: Creating Checkpoints
You need to explicitly state what you want to do at the "m5 checkpoint"
exit event, otherwise it'll just default to a regular exit.
You'll need to change the "on_exit_event" parameter when constructing the
Simulator. Something like this:
...
def create_checkpoint():
m5.checkpoint("<path to checkpoint>")
simulator = Simulator(
board=board,
on_exit_event={
ExitEvent.EXIT : (func() for func in [processor.switch]),
ExitEvent.CHECKPOINT: (func() for func in [create_checkpoint]),
},
...
Note here we're saying on the first EXIT (m5 exit) exit event we're
switching cores, and on the first CHECKPOINT(m5 checkpoint) exit event
we're creating the checkpoint.
--
Dr. Bobby R. Bruce
Room 3050,
Kemper Hall, UC Davis
Davis,
CA, 95616
web: https://www.bobbybruce.net
On Mon, Sep 5, 2022 at 3:31 PM Chrysanthos Pepi cpepi001@outlook.com
wrote:
Hello All,
I want to create checkpoints after a FS Ubuntu boot up with KVM and then
use that checkpoint to run multiple benchmarks with Timing/O3. Right now I
am using x86-ubuntu-run-with-kvm.py script to do that and it successfully
boots up and I am able to connect with the m5term to view the process.
I slightly modified the script to add the m5 checkpoint; command,
according to this, and it look like this:
command = "m5 exit;" \
+ "echo 'This is running on Timing CPU cores.';" \
+ "m5 checkpoint;" \ # Save a checkpoint
+ "sleep 1;" \ # Run a benchmark
+ "m5 exit;"
My understanding is that, on the 1st m5 exit it switches from KVM to
Timing so I want to get a checkpoint and later run a benchmark. I tried
that and I am able to see the echo message but then it terminates. Then I
tried to execute the same command trough m5term but still the same result
(attach log files)
Kind regards,
Chrysanthos Pepi
gem5-users mailing list -- gem5-users@gem5.org
To unsubscribe send an email to gem5-users-leave@gem5.org
gem5-users mailing list -- gem5-users@gem5.org
To unsubscribe send an email to gem5-users-leave@gem5.org
Thank you,
I modified the script to use classic caches and I was able to create a checkpoint.
Now, in order to restore it and run command/benchmark, we can pass the checkpoint_path into the Simulator and change the processor type from SimpleSwitchapleProcessor to SimpleProcessor?
I did that and the simulation started, connected with m5term but it stuck at “==== m5 terminal: Terminal 0 ====”
Kind regards,
Chrysanthos Pepi
From: Bobby Brucemailto:bbruce@ucdavis.edu
Sent: Tuesday, September 6, 2022 18:51
To: The gem5 Users mailing listmailto:gem5-users@gem5.org
Subject: [gem5-users] Re: Creating Checkpoints
There are two restrictions with Ruby and checkpointing that I'm aware of:
- You have to use MOESI_hammer or another protocol that implements that flush function.
- If you take a checkpoint in Ruby it has to be restored with Ruby.
I don't believe there are any such restrictions with classic caches.
--
Dr. Bobby R. Bruce
Room 3050,
Kemper Hall, UC Davis
Davis,
CA, 95616
web: https://www.bobbybruce.net
On Tue, Sep 6, 2022 at 2:42 PM Chrysanthos Pepi <cpepi001@outlook.commailto:cpepi001@outlook.com> wrote:
Hi Dr. Bruce,
Thank you for your reply. In order to create checkpoints do I need to use MOESI hammer protocol or classic caches?
Kind regards,
Chrysanthos Pepi
From: Bobby Brucemailto:bbruce@ucdavis.edu
Sent: Tuesday, September 6, 2022 12:46
To: The gem5 Users mailing listmailto:gem5-users@gem5.org
Subject: [gem5-users] Re: Creating Checkpoints
You need to explicitly state what you want to do at the "m5 checkpoint" exit event, otherwise it'll just default to a regular exit.
You'll need to change the "on_exit_event" parameter when constructing the Simulator. Something like this:
...
def create_checkpoint():
m5.checkpoint("<path to checkpoint>")
simulator = Simulator(
board=board,
on_exit_event={
ExitEvent.EXIT : (func() for func in [processor.switch]),
ExitEvent.CHECKPOINT: (func() for func in [create_checkpoint]),
},
...
Note here we're saying on the first EXIT (m5 exit) exit event we're switching cores, and on the first CHECKPOINT(m5 checkpoint) exit event we're creating the checkpoint.
--
Dr. Bobby R. Bruce
Room 3050,
Kemper Hall, UC Davis
Davis,
CA, 95616
web: https://www.bobbybruce.net
On Mon, Sep 5, 2022 at 3:31 PM Chrysanthos Pepi <cpepi001@outlook.commailto:cpepi001@outlook.com> wrote:
Hello All,
I want to create checkpoints after a FS Ubuntu boot up with KVM and then use that checkpoint to run multiple benchmarks with Timing/O3. Right now I am using x86-ubuntu-run-with-kvm.py script to do that and it successfully boots up and I am able to connect with the m5term to view the process.
I slightly modified the script to add the m5 checkpoint; command, according to this, and it look like this:
command = "m5 exit;" \
+ "echo 'This is running on Timing CPU cores.';" \
+ "m5 checkpoint;" \ # Save a checkpoint
+ "sleep 1;" \ # Run a benchmark
+ "m5 exit;"
My understanding is that, on the 1st m5 exit it switches from KVM to Timing so I want to get a checkpoint and later run a benchmark. I tried that and I am able to see the echo message but then it terminates. Then I tried to execute the same command trough m5term but still the same result (attach log files)
Kind regards,
Chrysanthos Pepi
gem5-users mailing list -- gem5-users@gem5.orgmailto:gem5-users@gem5.org
To unsubscribe send an email to gem5-users-leave@gem5.orgmailto:gem5-users-leave@gem5.org
gem5-users mailing list -- gem5-users@gem5.orgmailto:gem5-users@gem5.org
To unsubscribe send an email to gem5-users-leave@gem5.orgmailto:gem5-users-leave@gem5.org
Hey Chrysanthos,
My first thought here is the disk image I believe you are using, by
default, will exit once booted. I suspect you'll have to set
readfile_contents="/bin/bash" or something like that on your set_workload
function to be able to m5term into the simulation.
Could you send the config file you've built and the terminal output you're
seeing?
Kind regards,
Bobby
Dr. Bobby R. Bruce
Room 3050,
Kemper Hall, UC Davis
Davis,
CA, 95616
web: https://www.bobbybruce.net
On Wed, Sep 7, 2022 at 12:03 PM Chrysanthos Pepi cpepi001@outlook.com
wrote:
Thank you,
I modified the script to use classic caches and I was able to create a
checkpoint.
Now, in order to restore it and run command/benchmark, we can pass the
checkpoint_path into the Simulator and change the processor type from
SimpleSwitchapleProcessor to SimpleProcessor?
I did that and the simulation started, connected with m5term but it stuck
at “==== m5 terminal: Terminal 0 ====”
Kind regards,
Chrysanthos Pepi
*From: *Bobby Bruce bbruce@ucdavis.edu
*Sent: *Tuesday, September 6, 2022 18:51
*To: *The gem5 Users mailing list gem5-users@gem5.org
*Subject: *[gem5-users] Re: Creating Checkpoints
There are two restrictions with Ruby and checkpointing that I'm aware of:
-
You have to use MOESI_hammer or another protocol that implements that
flush function. -
If you take a checkpoint in Ruby it has to be restored with Ruby.
I don't believe there are any such restrictions with classic caches.
--
Dr. Bobby R. Bruce
Room 3050,
Kemper Hall, UC Davis
Davis,
CA, 95616
web: https://www.bobbybruce.net
On Tue, Sep 6, 2022 at 2:42 PM Chrysanthos Pepi cpepi001@outlook.com
wrote:
Hi Dr. Bruce,
Thank you for your reply. In order to create checkpoints do I need to use
MOESI hammer protocol or classic caches?
Kind regards,
Chrysanthos Pepi
*From: *Bobby Bruce bbruce@ucdavis.edu
*Sent: *Tuesday, September 6, 2022 12:46
*To: *The gem5 Users mailing list gem5-users@gem5.org
*Subject: *[gem5-users] Re: Creating Checkpoints
You need to explicitly state what you want to do at the "m5 checkpoint"
exit event, otherwise it'll just default to a regular exit.
You'll need to change the "on_exit_event" parameter when constructing the
Simulator. Something like this:
...
def create_checkpoint():
m5.checkpoint("<path to checkpoint>")
simulator = Simulator(
board=board,
on_exit_event={
ExitEvent.EXIT : (func() for func in [processor.switch]),
ExitEvent.CHECKPOINT: (func() for func in [create_checkpoint]),
},
...
Note here we're saying on the first EXIT (m5 exit) exit event we're
switching cores, and on the first CHECKPOINT(m5 checkpoint) exit event
we're creating the checkpoint.
--
Dr. Bobby R. Bruce
Room 3050,
Kemper Hall, UC Davis
Davis,
CA, 95616
web: https://www.bobbybruce.net
On Mon, Sep 5, 2022 at 3:31 PM Chrysanthos Pepi cpepi001@outlook.com
wrote:
Hello All,
I want to create checkpoints after a FS Ubuntu boot up with KVM and then
use that checkpoint to run multiple benchmarks with Timing/O3. Right now I
am using x86-ubuntu-run-with-kvm.py script to do that and it successfully
boots up and I am able to connect with the m5term to view the process.
I slightly modified the script to add the m5 checkpoint; command,
according to this, and it look like this:
command = "m5 exit;" \
+ "echo 'This is running on Timing CPU cores.';" \
+ "m5 checkpoint;" \ # Save a checkpoint
+ "sleep 1;" \ # Run a benchmark
+ "m5 exit;"
My understanding is that, on the 1st m5 exit it switches from KVM to
Timing so I want to get a checkpoint and later run a benchmark. I tried
that and I am able to see the echo message but then it terminates. Then I
tried to execute the same command trough m5term but still the same result
(attach log files)
Kind regards,
Chrysanthos Pepi
gem5-users mailing list -- gem5-users@gem5.org
To unsubscribe send an email to gem5-users-leave@gem5.org
gem5-users mailing list -- gem5-users@gem5.org
To unsubscribe send an email to gem5-users-leave@gem5.org
gem5-users mailing list -- gem5-users@gem5.org
To unsubscribe send an email to gem5-users-leave@gem5.org
Hi Bobby,
I attached the scripts and an output log (gem5, and m5term). I am not really sure how to properly restore the checkpoint and continue the readfile_contents commands. For now the command is an echo just to make it work and later I want to pass the benchmark to run.
Kind regards,
Chrysanthos Pepi
From: Bobby Brucemailto:bbruce@ucdavis.edu
Sent: Thursday, September 8, 2022 16:21
To: The gem5 Users mailing listmailto:gem5-users@gem5.org
Subject: [gem5-users] Re: Creating Checkpoints
Hey Chrysanthos,
My first thought here is the disk image I believe you are using, by default, will exit once booted. I suspect you'll have to set readfile_contents="/bin/bash" or something like that on your set_workload function to be able to m5term into the simulation.
Could you send the config file you've built and the terminal output you're seeing?
Kind regards,
Bobby
Dr. Bobby R. Bruce
Room 3050,
Kemper Hall, UC Davis
Davis,
CA, 95616
web: https://www.bobbybruce.net
On Wed, Sep 7, 2022 at 12:03 PM Chrysanthos Pepi <cpepi001@outlook.commailto:cpepi001@outlook.com> wrote:
Thank you,
I modified the script to use classic caches and I was able to create a checkpoint.
Now, in order to restore it and run command/benchmark, we can pass the checkpoint_path into the Simulator and change the processor type from SimpleSwitchapleProcessor to SimpleProcessor?
I did that and the simulation started, connected with m5term but it stuck at “==== m5 terminal: Terminal 0 ====”
Kind regards,
Chrysanthos Pepi
From: Bobby Brucemailto:bbruce@ucdavis.edu
Sent: Tuesday, September 6, 2022 18:51
To: The gem5 Users mailing listmailto:gem5-users@gem5.org
Subject: [gem5-users] Re: Creating Checkpoints
There are two restrictions with Ruby and checkpointing that I'm aware of:
- You have to use MOESI_hammer or another protocol that implements that flush function.
- If you take a checkpoint in Ruby it has to be restored with Ruby.
I don't believe there are any such restrictions with classic caches.
--
Dr. Bobby R. Bruce
Room 3050,
Kemper Hall, UC Davis
Davis,
CA, 95616
web: https://www.bobbybruce.net
On Tue, Sep 6, 2022 at 2:42 PM Chrysanthos Pepi <cpepi001@outlook.commailto:cpepi001@outlook.com> wrote:
Hi Dr. Bruce,
Thank you for your reply. In order to create checkpoints do I need to use MOESI hammer protocol or classic caches?
Kind regards,
Chrysanthos Pepi
From: Bobby Brucemailto:bbruce@ucdavis.edu
Sent: Tuesday, September 6, 2022 12:46
To: The gem5 Users mailing listmailto:gem5-users@gem5.org
Subject: [gem5-users] Re: Creating Checkpoints
You need to explicitly state what you want to do at the "m5 checkpoint" exit event, otherwise it'll just default to a regular exit.
You'll need to change the "on_exit_event" parameter when constructing the Simulator. Something like this:
...
def create_checkpoint():
m5.checkpoint("<path to checkpoint>")
simulator = Simulator(
board=board,
on_exit_event={
ExitEvent.EXIT : (func() for func in [processor.switch]),
ExitEvent.CHECKPOINT: (func() for func in [create_checkpoint]),
},
...
Note here we're saying on the first EXIT (m5 exit) exit event we're switching cores, and on the first CHECKPOINT(m5 checkpoint) exit event we're creating the checkpoint.
--
Dr. Bobby R. Bruce
Room 3050,
Kemper Hall, UC Davis
Davis,
CA, 95616
web: https://www.bobbybruce.net
On Mon, Sep 5, 2022 at 3:31 PM Chrysanthos Pepi <cpepi001@outlook.commailto:cpepi001@outlook.com> wrote:
Hello All,
I want to create checkpoints after a FS Ubuntu boot up with KVM and then use that checkpoint to run multiple benchmarks with Timing/O3. Right now I am using x86-ubuntu-run-with-kvm.py script to do that and it successfully boots up and I am able to connect with the m5term to view the process.
I slightly modified the script to add the m5 checkpoint; command, according to this, and it look like this:
command = "m5 exit;" \
+ "echo 'This is running on Timing CPU cores.';" \
+ "m5 checkpoint;" \ # Save a checkpoint
+ "sleep 1;" \ # Run a benchmark
+ "m5 exit;"
My understanding is that, on the 1st m5 exit it switches from KVM to Timing so I want to get a checkpoint and later run a benchmark. I tried that and I am able to see the echo message but then it terminates. Then I tried to execute the same command trough m5term but still the same result (attach log files)
Kind regards,
Chrysanthos Pepi
gem5-users mailing list -- gem5-users@gem5.orgmailto:gem5-users@gem5.org
To unsubscribe send an email to gem5-users-leave@gem5.orgmailto:gem5-users-leave@gem5.org
gem5-users mailing list -- gem5-users@gem5.orgmailto:gem5-users@gem5.org
To unsubscribe send an email to gem5-users-leave@gem5.orgmailto:gem5-users-leave@gem5.org
gem5-users mailing list -- gem5-users@gem5.orgmailto:gem5-users@gem5.org
To unsubscribe send an email to gem5-users-leave@gem5.orgmailto:gem5-users-leave@gem5.org
Hey Chrysanthos,
I apologize for taking so long to dive into this. I don't know exactly what
was wrong with your setup, but I think it was to do with how you were
setting the "readfile_contents" (the script to run when the boot was
loaded). Playing around with the scripts you sent, I eventually got a
working example. These are attached. The script which saves the checkpoint
uses a KVM core, and the script which restores uses a TIMING core.
Kind regards,
Bobby
Dr. Bobby R. Bruce
Room 3050,
Kemper Hall, UC Davis
Davis,
CA, 95616
web: https://www.bobbybruce.net
On Fri, Sep 9, 2022 at 3:17 PM Chrysanthos Pepi cpepi001@outlook.com
wrote:
Hi Bobby,
I attached the scripts and an output log (gem5, and m5term). I am not
really sure how to properly restore the checkpoint and continue the
readfile_contents commands. For now the command is an echo just to make
it work and later I want to pass the benchmark to run.
Kind regards,
Chrysanthos Pepi
*From: *Bobby Bruce bbruce@ucdavis.edu
*Sent: *Thursday, September 8, 2022 16:21
*To: *The gem5 Users mailing list gem5-users@gem5.org
*Subject: *[gem5-users] Re: Creating Checkpoints
Hey Chrysanthos,
My first thought here is the disk image I believe you are using, by
default, will exit once booted. I suspect you'll have to set
readfile_contents="/bin/bash" or something like that on your set_workload
function to be able to m5term into the simulation.
Could you send the config file you've built and the terminal output you're
seeing?
Kind regards,
Bobby
--
Dr. Bobby R. Bruce
Room 3050,
Kemper Hall, UC Davis
Davis,
CA, 95616
web: https://www.bobbybruce.net
On Wed, Sep 7, 2022 at 12:03 PM Chrysanthos Pepi cpepi001@outlook.com
wrote:
Thank you,
I modified the script to use classic caches and I was able to create a
checkpoint.
Now, in order to restore it and run command/benchmark, we can pass the
checkpoint_path into the Simulator and change the processor type from
SimpleSwitchapleProcessor to SimpleProcessor?
I did that and the simulation started, connected with m5term but it stuck
at “==== m5 terminal: Terminal 0 ====”
Kind regards,
Chrysanthos Pepi
*From: *Bobby Bruce bbruce@ucdavis.edu
*Sent: *Tuesday, September 6, 2022 18:51
*To: *The gem5 Users mailing list gem5-users@gem5.org
*Subject: *[gem5-users] Re: Creating Checkpoints
There are two restrictions with Ruby and checkpointing that I'm aware of:
-
You have to use MOESI_hammer or another protocol that implements that
flush function. -
If you take a checkpoint in Ruby it has to be restored with Ruby.
I don't believe there are any such restrictions with classic caches.
--
Dr. Bobby R. Bruce
Room 3050,
Kemper Hall, UC Davis
Davis,
CA, 95616
web: https://www.bobbybruce.net
On Tue, Sep 6, 2022 at 2:42 PM Chrysanthos Pepi cpepi001@outlook.com
wrote:
Hi Dr. Bruce,
Thank you for your reply. In order to create checkpoints do I need to use
MOESI hammer protocol or classic caches?
Kind regards,
Chrysanthos Pepi
*From: *Bobby Bruce bbruce@ucdavis.edu
*Sent: *Tuesday, September 6, 2022 12:46
*To: *The gem5 Users mailing list gem5-users@gem5.org
*Subject: *[gem5-users] Re: Creating Checkpoints
You need to explicitly state what you want to do at the "m5 checkpoint"
exit event, otherwise it'll just default to a regular exit.
You'll need to change the "on_exit_event" parameter when constructing the
Simulator. Something like this:
...
def create_checkpoint():
m5.checkpoint("<path to checkpoint>")
simulator = Simulator(
board=board,
on_exit_event={
ExitEvent.EXIT : (func() for func in [processor.switch]),
ExitEvent.CHECKPOINT: (func() for func in [create_checkpoint]),
},
...
Note here we're saying on the first EXIT (m5 exit) exit event we're
switching cores, and on the first CHECKPOINT(m5 checkpoint) exit event
we're creating the checkpoint.
--
Dr. Bobby R. Bruce
Room 3050,
Kemper Hall, UC Davis
Davis,
CA, 95616
web: https://www.bobbybruce.net
On Mon, Sep 5, 2022 at 3:31 PM Chrysanthos Pepi cpepi001@outlook.com
wrote:
Hello All,
I want to create checkpoints after a FS Ubuntu boot up with KVM and then
use that checkpoint to run multiple benchmarks with Timing/O3. Right now I
am using x86-ubuntu-run-with-kvm.py script to do that and it successfully
boots up and I am able to connect with the m5term to view the process.
I slightly modified the script to add the m5 checkpoint; command,
according to this, and it look like this:
command = "m5 exit;" \
+ "echo 'This is running on Timing CPU cores.';" \
+ "m5 checkpoint;" \ # Save a checkpoint
+ "sleep 1;" \ # Run a benchmark
+ "m5 exit;"
My understanding is that, on the 1st m5 exit it switches from KVM to
Timing so I want to get a checkpoint and later run a benchmark. I tried
that and I am able to see the echo message but then it terminates. Then I
tried to execute the same command trough m5term but still the same result
(attach log files)
Kind regards,
Chrysanthos Pepi
gem5-users mailing list -- gem5-users@gem5.org
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Hi Bobby,
Thank you very much! Now it works.
Kind regards,
Chrysanthos Pepi
From: Bobby Brucemailto:bbruce@ucdavis.edu
Sent: Wednesday, September 14, 2022 17:24
To: The gem5 Users mailing listmailto:gem5-users@gem5.org
Subject: [gem5-users] Re: Creating Checkpoints
Hey Chrysanthos,
I apologize for taking so long to dive into this. I don't know exactly what was wrong with your setup, but I think it was to do with how you were setting the "readfile_contents" (the script to run when the boot was loaded). Playing around with the scripts you sent, I eventually got a working example. These are attached. The script which saves the checkpoint uses a KVM core, and the script which restores uses a TIMING core.
Kind regards,
Bobby
Dr. Bobby R. Bruce
Room 3050,
Kemper Hall, UC Davis
Davis,
CA, 95616
web: https://www.bobbybruce.net
On Fri, Sep 9, 2022 at 3:17 PM Chrysanthos Pepi <cpepi001@outlook.commailto:cpepi001@outlook.com> wrote:
Hi Bobby,
I attached the scripts and an output log (gem5, and m5term). I am not really sure how to properly restore the checkpoint and continue the readfile_contents commands. For now the command is an echo just to make it work and later I want to pass the benchmark to run.
Kind regards,
Chrysanthos Pepi
From: Bobby Brucemailto:bbruce@ucdavis.edu
Sent: Thursday, September 8, 2022 16:21
To: The gem5 Users mailing listmailto:gem5-users@gem5.org
Subject: [gem5-users] Re: Creating Checkpoints
Hey Chrysanthos,
My first thought here is the disk image I believe you are using, by default, will exit once booted. I suspect you'll have to set readfile_contents="/bin/bash" or something like that on your set_workload function to be able to m5term into the simulation.
Could you send the config file you've built and the terminal output you're seeing?
Kind regards,
Bobby
Dr. Bobby R. Bruce
Room 3050,
Kemper Hall, UC Davis
Davis,
CA, 95616
web: https://www.bobbybruce.net
On Wed, Sep 7, 2022 at 12:03 PM Chrysanthos Pepi <cpepi001@outlook.commailto:cpepi001@outlook.com> wrote:
Thank you,
I modified the script to use classic caches and I was able to create a checkpoint.
Now, in order to restore it and run command/benchmark, we can pass the checkpoint_path into the Simulator and change the processor type from SimpleSwitchapleProcessor to SimpleProcessor?
I did that and the simulation started, connected with m5term but it stuck at “==== m5 terminal: Terminal 0 ====”
Kind regards,
Chrysanthos Pepi
From: Bobby Brucemailto:bbruce@ucdavis.edu
Sent: Tuesday, September 6, 2022 18:51
To: The gem5 Users mailing listmailto:gem5-users@gem5.org
Subject: [gem5-users] Re: Creating Checkpoints
There are two restrictions with Ruby and checkpointing that I'm aware of:
- You have to use MOESI_hammer or another protocol that implements that flush function.
- If you take a checkpoint in Ruby it has to be restored with Ruby.
I don't believe there are any such restrictions with classic caches.
--
Dr. Bobby R. Bruce
Room 3050,
Kemper Hall, UC Davis
Davis,
CA, 95616
web: https://www.bobbybruce.net
On Tue, Sep 6, 2022 at 2:42 PM Chrysanthos Pepi <cpepi001@outlook.commailto:cpepi001@outlook.com> wrote:
Hi Dr. Bruce,
Thank you for your reply. In order to create checkpoints do I need to use MOESI hammer protocol or classic caches?
Kind regards,
Chrysanthos Pepi
From: Bobby Brucemailto:bbruce@ucdavis.edu
Sent: Tuesday, September 6, 2022 12:46
To: The gem5 Users mailing listmailto:gem5-users@gem5.org
Subject: [gem5-users] Re: Creating Checkpoints
You need to explicitly state what you want to do at the "m5 checkpoint" exit event, otherwise it'll just default to a regular exit.
You'll need to change the "on_exit_event" parameter when constructing the Simulator. Something like this:
...
def create_checkpoint():
m5.checkpoint("<path to checkpoint>")
simulator = Simulator(
board=board,
on_exit_event={
ExitEvent.EXIT : (func() for func in [processor.switch]),
ExitEvent.CHECKPOINT: (func() for func in [create_checkpoint]),
},
...
Note here we're saying on the first EXIT (m5 exit) exit event we're switching cores, and on the first CHECKPOINT(m5 checkpoint) exit event we're creating the checkpoint.
--
Dr. Bobby R. Bruce
Room 3050,
Kemper Hall, UC Davis
Davis,
CA, 95616
web: https://www.bobbybruce.net
On Mon, Sep 5, 2022 at 3:31 PM Chrysanthos Pepi <cpepi001@outlook.commailto:cpepi001@outlook.com> wrote:
Hello All,
I want to create checkpoints after a FS Ubuntu boot up with KVM and then use that checkpoint to run multiple benchmarks with Timing/O3. Right now I am using x86-ubuntu-run-with-kvm.py script to do that and it successfully boots up and I am able to connect with the m5term to view the process.
I slightly modified the script to add the m5 checkpoint; command, according to this, and it look like this:
command = "m5 exit;" \
+ "echo 'This is running on Timing CPU cores.';" \
+ "m5 checkpoint;" \ # Save a checkpoint
+ "sleep 1;" \ # Run a benchmark
+ "m5 exit;"
My understanding is that, on the 1st m5 exit it switches from KVM to Timing so I want to get a checkpoint and later run a benchmark. I tried that and I am able to see the echo message but then it terminates. Then I tried to execute the same command trough m5term but still the same result (attach log files)
Kind regards,
Chrysanthos Pepi
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