Hi, I'm currently experimenting with Spectre on gem5, and I'm dumping debugging output using the O3PipeView flag. However, I get a lot of output for instructions that are not relevant to the attack sequence. I was wondering if it's possible to limit the debugging output to a certain instruction address range. I know I can limit it to a tick range, but I'd like to dump every instance of the attack, not just a specific one. I have the instruction addresses for the attack and it would be great if I can just use that. Another option would be to dynamically enable and disable debugging output (or the O3PipeView flag, at least) using an m5op. Yet another option is a way to enable/disable debugging in the config script mid-simulation. This would allow me to exit the simulation using an m5op before the instructions, enable debugging in the config script, continue, exit using an m5op after the instructions, disable debugging, etc. Any help is greatly appreciated. Thank you. Best, Hossam

Hi Hossam, > Yet another option is a way to enable/disable debugging in the config script mid-simulation. This would allow me to exit the simulation using an m5op before the instructions, enable debugging in the config script, continue, exit using an m5op after the instructions, disable debugging, etc. You can definitely do this. You can use the m5.trace.enable() and m5.trace.disable() functions in python to enable and disable the debug output. You can use m5 ops to exit the simulation as you mentioned as well and then call these functions. Cheers, Jason On Wed, Feb 21, 2024 at 10:46 AM Hossam ElAtali via gem5-users < gem5-users@gem5.org> wrote: > Hi, > > I'm currently experimenting with Spectre on gem5, and I'm dumping > debugging output using the O3PipeView flag. However, I get a lot of output > for instructions that are not relevant to the attack sequence. I was > wondering if it's possible to limit the debugging output to a certain > instruction address range. I know I can limit it to a tick range, but I'd > like to dump every instance of the attack, not just a specific one. I have > the instruction addresses for the attack and it would be great if I can > just use that. > > Another option would be to dynamically enable and disable debugging output > (or the O3PipeView flag, at least) using an m5op. > > Yet another option is a way to enable/disable debugging in the config > script mid-simulation. This would allow me to exit the simulation using an > m5op before the instructions, enable debugging in the config script, > continue, exit using an m5op after the instructions, disable debugging, etc. > > Any help is greatly appreciated. Thank you. > > Best, > Hossam > _______________________________________________ > gem5-users mailing list -- gem5-users@gem5.org > To unsubscribe send an email to gem5-users-leave@gem5.org >

Hi Jason, Thanks for the very quick response! I managed to surround the ROI with m5op instructions to issue WORKBEGIN and WORKEND events, but now the stats.txt​ file is getting out of hand. It dumps stats every time the simulation pauses. Is there a way to make it not dump on every event or disable it altogether? I tried using the --stats-file​ command line option with an empty string but that caused a crash. I also tried truncating and/or deleting the file in the event handler in the config script (using the open and truncate python functions), but that did nothing (my guess is because the file is already open elsewhere). Thanks again! Best, Hossam ________________________________ From: Jason Lowe-Power <jason@lowepower.com> Sent: Wednesday, February 21, 2024 1:59 PM To: The gem5 Users mailing list <gem5-users@gem5.org> Cc: Hossam ElAtali <hossam.elatali@uwaterloo.ca> Subject: Re: [gem5-users] Limit debug output to certain instruction address range Hi Hossam, > Yet another option is a way to enable/disable debugging in the config script mid-simulation. This would allow me to exit the simulation using an m5op before the instructions, enable debugging in the config script, continue, exit using an m5op after the instructions, disable debugging, etc. You can definitely do this. You can use the m5.trace.enable() and m5.trace.disable() functions in python to enable and disable the debug output. You can use m5 ops to exit the simulation as you mentioned as well and then call these functions. Cheers, Jason On Wed, Feb 21, 2024 at 10:46 AM Hossam ElAtali via gem5-users <gem5-users@gem5.org<mailto:gem5-users@gem5.org>> wrote: Hi, I'm currently experimenting with Spectre on gem5, and I'm dumping debugging output using the O3PipeView flag. However, I get a lot of output for instructions that are not relevant to the attack sequence. I was wondering if it's possible to limit the debugging output to a certain instruction address range. I know I can limit it to a tick range, but I'd like to dump every instance of the attack, not just a specific one. I have the instruction addresses for the attack and it would be great if I can just use that. Another option would be to dynamically enable and disable debugging output (or the O3PipeView flag, at least) using an m5op. Yet another option is a way to enable/disable debugging in the config script mid-simulation. This would allow me to exit the simulation using an m5op before the instructions, enable debugging in the config script, continue, exit using an m5op after the instructions, disable debugging, etc. Any help is greatly appreciated. Thank you. Best, Hossam _______________________________________________ gem5-users mailing list -- gem5-users@gem5.org<mailto:gem5-users@gem5.org> To unsubscribe send an email to gem5-users-leave@gem5.org<mailto:gem5-users-leave@gem5.org>

Hi Hossam, If you're using the stdlib, you can override the default ROI begin handler. See the documentation here: https://github.com/gem5/gem5/blob/stable/src/python/gem5/simulate/simulator.py#L145 If you're not using the stdlib, then look for where the code you're using calls m5.stats.dump() and comment it out :) Cheers, Jason On Wed, Feb 21, 2024 at 4:59 PM Hossam ElAtali <hossam.elatali@uwaterloo.ca> wrote: > Hi Jason, > > Thanks for the very quick response! > > I managed to surround the ROI with m5op instructions to issue WORKBEGIN > and WORKEND events, but now the stats.txt​ file is getting out of hand. > It dumps stats every time the simulation pauses. Is there a way to make it > not dump on every event or disable it altogether? I tried using the > --stats-file​ command line option with an empty string but that caused a > crash. I also tried truncating and/or deleting the file in the event > handler in the config script (using the open and truncate python > functions), but that did nothing (my guess is because the file is already > open elsewhere). > > Thanks again! > > Best, > Hossam > ------------------------------ > *From:* Jason Lowe-Power <jason@lowepower.com> > *Sent:* Wednesday, February 21, 2024 1:59 PM > *To:* The gem5 Users mailing list <gem5-users@gem5.org> > *Cc:* Hossam ElAtali <hossam.elatali@uwaterloo.ca> > *Subject:* Re: [gem5-users] Limit debug output to certain instruction > address range > > Hi Hossam, > > > Yet another option is a way to enable/disable debugging in the config > script mid-simulation. This would allow me to exit the simulation using an > m5op before the instructions, enable debugging in the config script, > continue, exit using an m5op after the instructions, disable debugging, etc. > > You can definitely do this. > > You can use the m5.trace.enable() and m5.trace.disable() functions in > python to enable and disable the debug output. You can use m5 ops to exit > the simulation as you mentioned as well and then call these functions. > > Cheers, > Jason > > On Wed, Feb 21, 2024 at 10:46 AM Hossam ElAtali via gem5-users < > gem5-users@gem5.org> wrote: > > Hi, > > I'm currently experimenting with Spectre on gem5, and I'm dumping > debugging output using the O3PipeView flag. However, I get a lot of output > for instructions that are not relevant to the attack sequence. I was > wondering if it's possible to limit the debugging output to a certain > instruction address range. I know I can limit it to a tick range, but I'd > like to dump every instance of the attack, not just a specific one. I have > the instruction addresses for the attack and it would be great if I can > just use that. > > Another option would be to dynamically enable and disable debugging output > (or the O3PipeView flag, at least) using an m5op. > > Yet another option is a way to enable/disable debugging in the config > script mid-simulation. This would allow me to exit the simulation using an > m5op before the instructions, enable debugging in the config script, > continue, exit using an m5op after the instructions, disable debugging, etc. > > Any help is greatly appreciated. Thank you. > > Best, > Hossam > _______________________________________________ > gem5-users mailing list -- gem5-users@gem5.org > To unsubscribe send an email to gem5-users-leave@gem5.org > >