Hi Yinchong, I am not quite sure the exact meaning of "memory initialization" you mentioned (DRAM initialization steps? or Data initialization). If you care about how data is accessed by the gem5, I may give you some clue.
In SE mode, your host machine first allocates a large memory space for your benchmark. The data is actually in this memory space. Gem5 remembers the starting address so that it knows where the data should be read from or written to your host machine. On the other hand, the virtual main memory only behaves like a timing model but never stores the real data. As a result, it seems the data has been initialized prior to the simulation. -Tao On 02/05/2013 01:06 PM, Yinchong Feng wrote: > I think that it's Main Memory. > It shows like below： > > 0: 0: system.physmem: Write of size 4096 on address 0x0 > 0: system.physmem: 00000000 7f 45 4c 46 01 01 01 00 00 00 00 00 00 00 > 00 00 ELF > 0: system.physmem: 00000010 02 00 28 00 01 00 00 00 34 9c 00 00 34 00 > 00 00 ( 4 4 > 0: system.physmem: 00000020 f0 c2 09 00 02 00 00 05 34 00 20 00 08 00 > 28 00 pB 4 ( > 0: system.physmem: 00000030 14 00 12 00 06 00 00 00 34 00 00 00 34 80 > 00 00 4 4 > 0: system.physmem: 00000040 34 80 00 00 00 01 00 00 00 01 00 00 04 00 > 00 00 4 > 0: system.physmem: 00000050 04 00 00 00 04 00 00 00 38 01 00 00 38 81 > 00 00 8 8 > 0: system.physmem: 00000060 38 81 00 00 20 00 00 00 20 00 00 00 04 00 > 00 00 8 > 0: system.physmem: 00000070 04 00 00 00 07 00 00 00 d4 d6 07 00 d4 d6 > 08 00 TV TV > > Do you have any idea? > > Thanks, > Yinchong > > > 2013/2/5 Tao Zhang <[email protected] > <mailto:[email protected]>> > > do you mean cache or main memory? > > -Tao > > > On 02/05/2013 11:46 AM, Yinchong Feng wrote: >> Hi All, >> >> I'm new at using gem5, and I'm trying to run benchmarks on gem5 >> in SE mode. I feel confused about the momory initialization in SE >> mode. When I ran the bianries with debug-flags MemoryAccess, >> MemDepUnit and MemTest, I saw that the memory was initialized >> before the real simulation starting. Could you please tell me >> where the data is from? >> >> Best regards, >> Yinchong >> >> >> _______________________________________________ >> gem5-users mailing list >> [email protected] <mailto:[email protected]> >> http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users > > _______________________________________________ > gem5-users mailing list > [email protected] <mailto:[email protected]> > http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users > > > > _______________________________________________ > gem5-users mailing list > [email protected] > http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users
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