You're right, but I'll try to fill this out a little. There are 2 types of memory systems, atomic and timing. Functional accesses happen in both models as a way of setting things up outside of the rules of the simulation itself. That would be to, for instance, service system calls or load processes in SE mode, or to load a kernel image in FS mode.
There are 4 CPU models, although 1 is still mostly under development right now. These are, along with the memory system mode they work with: 1. Simple CPU - atomic 2. Simple CPU - timing 3. O3 CPU - timing 4. In order - timing The in order model is the newest and is actively being worked on to support more ISAs, etc. When you pass -d to fs.py, you're asking for the O3 CPU model which only works on a timing memory system. If you don't, you're going to automatically use the simple CPU model. That model defaults to atomic mode, I believe, so you need to specify --timing if you want a timing memory system. If you want to use the in order model, you would specify --inorder. I think since that can only be used with a timing memory system that's what you get implicitly like O3, but I haven't tried it myself. Gabe Quoting Shoaib Akram <[email protected]>: > --detailed implies timing memory accesses. > > ---- Original message ---- >> Date: Wed, 29 Apr 2009 14:09:14 -0500 >> From: ef <[email protected]> >> Subject: Re: [m5-users] Simple M5 Question: memory system and CPU types >> To: M5 users mailing list <[email protected]> >> >> Hello, >> >> -t gives you simpel cpu (timing mode) and timing >> memory model I presume. >> >> So how do I get an O3 with a timing memory model? >> >> Thanks >> >> ---- Original message ---- >> >Date: Wed, 29 Apr 2009 13:39:55 -0500 >> >From: ef <[email protected]> >> >Subject: [m5-users] Simple M5 Question: memory >> system and CPU types >> >To: [email protected] >> > >> > Hi, >> > >> > This question is probably really simple, and >> I have >> > read documentation repeatedly, but the >> semantics are >> > just confusing me. >> > >> > So, >> > We have 3 types of processors: O3,Simple, and >> > Atomic. >> > We then have three types of memory systems >> Timing, >> > Atomic, Functional. >> > >> > In the M5 command line using the default >> python >> > scripts (fs.py) when you type -d --caches >> -l2cache > you will get a O3 processor with a timing >> memory >> > system. >> > When you use -t you will get a Simple cpu >> with a >> > functional memory system. >> > When you fast foward you get Atomic memory >> and >> > processor. >> > >> > Is this correct? Or did I totally get it >> wrong? >> > >> > Thanks, >> >________________ >> >_______________________________________________ >> >m5-users mailing list >> >[email protected] >> >http://m5sim.org/cgi-bin/mailman/listinfo/m5-users >> _______________________________________________ >> m5-users mailing list >> [email protected] >> http://m5sim.org/cgi-bin/mailman/listinfo/m5-users >> ________________ >> _______________________________________________ >> m5-users mailing list >> [email protected] >> http://m5sim.org/cgi-bin/mailman/listinfo/m5-users > _______________________________________________ > m5-users mailing list > [email protected] > http://m5sim.org/cgi-bin/mailman/listinfo/m5-users > _______________________________________________ m5-users mailing list [email protected] http://m5sim.org/cgi-bin/mailman/listinfo/m5-users
