Great, now I see the reason that they check for non-caching cpu in scripts. We used to use AtomicSimpleCPU and fastmem option for checkpointing, and NonCachingSimpleCPU is a replacement for this.
Thanks Daniel and Abhishek, Ali On Sun, Mar 15, 2020 at 8:23 AM Daniel Carvalho <oda...@yahoo.com.br> wrote: > In particular, the following description seems to be relevant to your > questions: > > "Simple CPU model based on the atomic CPU. Unlike the atomic CPU, this > model causes the memory system to bypass caches and is therefore slightly > faster in some cases. However, its main purpose is as a substitute for > hardware virtualized CPUs when stress-testing the memory system." > > > You can find further details in the commit that introduced > NonCachingSimpleCPU: > https://gem5-review.googlesource.com/c/public/gem5/+/12419 > > > When checkpoints/simpoints are taken, the cache contents are not stored, > therefore it would not matter if you created the checkpoints with them. > Then, when you restore the checkpoints, you must provide the real desired > configuration, which would include the cache hierarchy and your > non-cache-bypassing CPU type. As such, when the checkpoints are restored, > the caches will be empty, so you should provide a warmup period to fill > them. > > > Regards, > > Daniel > Em sábado, 14 de março de 2020 23:04:40 GMT+1, Abhishek Singh < > abhishek.singh199...@gmail.com> escreveu: > > > Hi, > > I do not know the reason for that. But if you want to create simpoints > which will be used by O3CPU, you should use the AtomicSimpleCPU with > "--caches" option and also add "--l2cache" if your O3CPU is using L2 cache. > > Best regards, > > Abhishek > > > On Sat, Mar 14, 2020 at 5:53 PM Ali Hajiabadi <ahajiabad...@gmail.com> > wrote: > > Thanks for your reply. But se.py script checks that the CPU type is > non-caching. Is there a reason for that? Can I ignore those checks? > > On Sun, Mar 15, 2020 at 5:41 AM Abhishek Singh < > abhishek.singh199...@gmail.com> wrote: > > Hi, > I would advise using Atomic Simple Cpu with “—caches” option to create > Simpoints > > > On Sat, Mar 14, 2020 at 5:35 PM Ali Hajiabadi <ahajiabad...@gmail.com> > wrote: > > Hi everyone, > > What is the difference between using NonCachingSimpleCPU > and AtomicSimpleCPU in order to profile and taking simpoints and > checkpoints? I want to use checkpoints to simulate and evaluate my own > modified version of O3 core model. Which CPU type is the best to profile > and take checkpoints? I don't want to bypass caches in my O3 model. > > Also, I am using RISCV implementation of gem5. > > Thanks, > Ali > _______________________________________________ > gem5-users mailing list > gem5-users@gem5.org > http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users > > _______________________________________________ > gem5-users mailing list > gem5-users@gem5.org > http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users > > _______________________________________________ > gem5-users mailing list > gem5-users@gem5.org > http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users > > _______________________________________________ > gem5-users mailing list > gem5-users@gem5.org > http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users >
_______________________________________________ gem5-users mailing list gem5-users@gem5.org http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users
