Hello everyone, I have two questions: 1) I see two ways (if I am not wrong) to modify the properties of the CPU and memory hierarchy. The first one is using command line options like "-n 2" or "--l1d_size=L1D_SIZE" etc.. The second one is modifying the "se.py" configuration file and adding objects and assign attributes of the objects new values for example: "cpu = SimpleCPU(clock = '2GHz', width = 2)" Is there any difference between these two ways to modify the CPU or memory properties? Can someone please explain what is the benefit of using script file (se.py) 2) I want to change the internal structures of the CPU like "numIQEntries" or "commitWidth".. I think I need to change the O3CPU.py file in the /src directory and build the gem5 again.. Is there any easier option to do this modification? Building gem5 each time is a time consuming and inefficient way.. Thanks in advance, Burak -- *Mehmet Burak AYKENAR Graduate Student of Computer Engineering Research Assistant **TOBB ETU Z-10 Microprocessors Laboratory* * mbaykenar.etu.edu.tr mbaykenar(a)etu.edu.tr*

Hi >Can someone please explain what is the benefit of using script file (se.py) Not all attibutes can be passed to command line. For example, number of mshr, prefetcher, .... So they should be defined in script >Is there any easier option to do this modification? See how Caches.py works and is called in se.py Then you can also create a similar config file for cpu, and modify the parameters you want. Hope that helps On 1/7/12, Mehmet Burak Aykenar <mbaykenar(a)etu.edu.tr> wrote: > Hello everyone, > > I have two questions: > > 1) I see two ways (if I am not wrong) to modify the properties of the CPU > and memory hierarchy. The first one is using command line options like "-n > 2" or "--l1d_size=L1D_SIZE" etc.. The second one is modifying the "se.py" > configuration file and adding objects and assign attributes of the objects > new values for example: "cpu = SimpleCPU(clock = '2GHz', width = 2)" > > Is there any difference between these two ways to modify the CPU or memory > properties? Can someone please explain what is the benefit of using script > file (se.py) > > 2) I want to change the internal structures of the CPU like "numIQEntries" > or "commitWidth".. I think I need to change the O3CPU.py file in the /src > directory and build the gem5 again.. Is there any easier option to do this > modification? Building gem5 each time is a time consuming and inefficient > way.. > > Thanks in advance, > Burak > -- > *Mehmet Burak AYKENAR > Graduate Student of Computer Engineering > Research Assistant > **TOBB ETU Z-10 > Microprocessors Laboratory* > * > mbaykenar.etu.edu.tr > mbaykenar(a)etu.edu.tr* > -- -- // Naderan *Mahmood;

Hi, thanks for quick reply Mahmood, I appreciate it.. I think I got the idea.. By looking inside the "config.ini" file I changed internal module attributes of the CPU by adding lines ... CPUClass.issueToExecuteDelay = 2 CPUClass.decodeWidth = 4 CPUClass.commitWidth = 4 CPUClass.issueWidth = 4 CPUClass.numIQEntries = 32 ... and for the next simulation, I got what I expected. 'config.ini' and 'stats.txt' has changed (the IPC reduced significantly for example) I assume I did the correct thing :) ,means if you noticed what I have done is wrong please inform me :) Regards, Burak 2012/1/7 Mahmood Naderan <mahmood.nt(a)gmail.com> > Hi > > >Can someone please explain what is the benefit of using script file > (se.py) > Not all attibutes can be passed to command line. For example, number > of mshr, prefetcher, .... So they should be defined in script > > > >Is there any easier option to do this modification? > See how Caches.py works and is called in se.py > Then you can also create a similar config file for cpu, and modify the > parameters you want. > > Hope that helps > > On 1/7/12, Mehmet Burak Aykenar <mbaykenar(a)etu.edu.tr> wrote: > > Hello everyone, > > > > I have two questions: > > > > 1) I see two ways (if I am not wrong) to modify the properties of the CPU > > and memory hierarchy. The first one is using command line options like > "-n > > 2" or "--l1d_size=L1D_SIZE" etc.. The second one is modifying the "se.py" > > configuration file and adding objects and assign attributes of the > objects > > new values for example: "cpu = SimpleCPU(clock = '2GHz', width = 2)" > > > > Is there any difference between these two ways to modify the CPU or > memory > > properties? Can someone please explain what is the benefit of using > script > > file (se.py) > > > > 2) I want to change the internal structures of the CPU like > "numIQEntries" > > or "commitWidth".. I think I need to change the O3CPU.py file in the /src > > directory and build the gem5 again.. Is there any easier option to do > this > > modification? Building gem5 each time is a time consuming and inefficient > > way.. > > > > Thanks in advance, > > Burak > > -- > > *Mehmet Burak AYKENAR > > Graduate Student of Computer Engineering > > Research Assistant > > **TOBB ETU Z-10 > > Microprocessors Laboratory* > > * > > mbaykenar.etu.edu.tr > > mbaykenar(a)etu.edu.tr* > > > > > -- > -- > // Naderan *Mahmood; > _______________________________________________ > gem5-users mailing list > gem5-users(a)gem5.org > http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users > > > !DSPAM:6374,4f083e3e7441685123195! > > > -- *Mehmet Burak AYKENAR Graduate Student of Computer Engineering Research Assistant **TOBB ETU Z-10 Microprocessors Laboratory* * mbaykenar.etu.edu.tr mbaykenar(a)etu.edu.tr*

That's ok, but it would break if you had a different CPU model activated. The better thing to do is something like: class MyO3Cpu(DerivO3CPU) issueToExecuteDelay = 2 decodeWidth = 4 … and every where in Simulation.py replace DerivO3CPU with MyO3Cpu Ali On Jan 7, 2012, at 11:22 AM, Mehmet Burak Aykenar wrote: > Hi, thanks for quick reply Mahmood, I appreciate it.. > > I think I got the idea.. By looking inside the "config.ini" file I changed internal module attributes of the CPU by adding lines > > ... > CPUClass.issueToExecuteDelay = 2 > CPUClass.decodeWidth = 4 > CPUClass.commitWidth = 4 > CPUClass.issueWidth = 4 > CPUClass.numIQEntries = 32 > ... > > and for the next simulation, I got what I expected. 'config.ini' and 'stats.txt' has changed (the IPC reduced significantly for example) > I assume I did the correct thing :) ,means if you noticed what I have done is wrong please inform me :) > > Regards, > Burak > > 2012/1/7 Mahmood Naderan <mahmood.nt(a)gmail.com> > Hi > > >Can someone please explain what is the benefit of using script file (se.py) > Not all attibutes can be passed to command line. For example, number > of mshr, prefetcher, .... So they should be defined in script > > > >Is there any easier option to do this modification? > See how Caches.py works and is called in se.py > Then you can also create a similar config file for cpu, and modify the > parameters you want. > > Hope that helps > > On 1/7/12, Mehmet Burak Aykenar <mbaykenar(a)etu.edu.tr> wrote: > > Hello everyone, > > > > I have two questions: > > > > 1) I see two ways (if I am not wrong) to modify the properties of the CPU > > and memory hierarchy. The first one is using command line options like "-n > > 2" or "--l1d_size=L1D_SIZE" etc.. The second one is modifying the "se.py" > > configuration file and adding objects and assign attributes of the objects > > new values for example: "cpu = SimpleCPU(clock = '2GHz', width = 2)" > > > > Is there any difference between these two ways to modify the CPU or memory > > properties? Can someone please explain what is the benefit of using script > > file (se.py) > > > > 2) I want to change the internal structures of the CPU like "numIQEntries" > > or "commitWidth".. I think I need to change the O3CPU.py file in the /src > > directory and build the gem5 again.. Is there any easier option to do this > > modification? Building gem5 each time is a time consuming and inefficient > > way.. > > > > Thanks in advance, > > Burak > > -- > > *Mehmet Burak AYKENAR > > Graduate Student of Computer Engineering > > Research Assistant > > **TOBB ETU Z-10 > > Microprocessors Laboratory* > > * > > mbaykenar.etu.edu.tr > > mbaykenar(a)etu.edu.tr* > > > > > -- > -- > // Naderan *Mahmood; > _______________________________________________ > gem5-users mailing list > gem5-users(a)gem5.org > http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users > > > !DSPAM:6374,4f083e3e7441685123195! > > > > > > -- > Mehmet Burak AYKENAR > Graduate Student of Computer Engineering > Research Assistant > TOBB ETU Z-10 > Microprocessors Laboratory > > mbaykenar.etu.edu.tr > mbaykenar(a)etu.edu.tr > _______________________________________________ > gem5-users mailing list > gem5-users(a)gem5.org > http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users