Hi Navin, If you want DRAM-related stats you need to look at the functions in DRAMCtrl. There you have plenty stats already tracking how many bytes are accessed per page etc, and it should not be too tricky to add what you need.
As already pointed out, the DRAMCtrl does not actually deal with the simulated memory data, merely the timing. Andreas From: gem5-users <[email protected]<mailto:[email protected]>> on behalf of Navin Kashyap <[email protected]<mailto:[email protected]>> Reply-To: gem5 users mailing list <[email protected]<mailto:[email protected]>> Date: Tuesday, 21 March 2017 at 22:00 To: gem5 users mailing list <[email protected]<mailto:[email protected]>> Subject: Re: [gem5-users] Memory allocation in DRAM Hi, It does have data: (not the dram_ctrl.cc, but abstract_mem.cc) So, the way it works is: data is loaded into the memory space (pmemAddr), which actually stores data. DRAMSim etc as you pointed out gives a wrapper to simulate DRAM accesses, but the packet when it needs data is finally loaded from abstract_mem.cc. Cache in gem5 does handle data and it gets it from this particular memory. I have checked the flow and also am able to see the data flow. My question is: How do I load the data completely before access happens. From what I understand, data gets loaded only when accessed for the first time (they seem to be doing it using functional access or something like that) In dram_ctrl.cc: // do the actual memory access and turn the packet into a response access(pkt); In abstract_mem.cc: (In the access function) uint8_t *hostAddr = pmemAddr + pkt->getAddr() - range.start(); std::memcpy(pkt->getPtr<uint8_t>(), hostAddr, pkt->getSize()); On Wed, Mar 22, 2017 at 12:48 PM, hassan yamin <[email protected]<mailto:[email protected]>> wrote: From my observation, if you see the AbstractMemory.py file, there is a parameter null, which states that do not store data, always return zero.. I have debugged it in DRAMSim2, it actually returns no data... Check this again.. On Wed, Mar 22, 2017 at 1:39 PM, Navin Kashyap <[email protected]<mailto:[email protected]>> wrote: > Hi, > Yes, the data is stored in abstract_mem.cc as physical memory. So, when the > page is first touched, I access all the addresses that belong to the page > from abstract_mem (physical memory), to collect the stats. But I see that > the entire data is not loaded for the range of addresses in the page. > > On Wed, Mar 22, 2017 at 12:36 PM, hassan yamin > <[email protected]<mailto:[email protected]>> > wrote: >> >> Navin, i think u are missing something, the dram_ctrl.cc or or any >> other dram simulator like DRAMSim2 does not do any actual data >> storage. They just simulate the DRAM for performance and energy >> consumption related stats. They are not meant to do any actual data >> storage. Hope that helps. >> >> Hassan >> >> On Wed, Mar 22, 2017 at 1:19 PM, Navin Kashyap >> <[email protected]<mailto:[email protected]>> wrote: >> > Hi, >> > I am running gem5 in SE mode with DRAM. >> > I wanted to collect stats per page (row) in the main memory (DRAM). >> > I have added code such that when a page is first accessed, I visit all >> > the >> > columns and collect the stats related to the data each column holds. >> > But, I think that the entire page (row) is not loaded when the page is >> > first >> > accessed (apart from writing to abstract memory from dram_ctrl.cc, there >> > are >> > other paths to write data)? >> > How do I know when the entire page is loaded in SE mode? >> > >> > I am using 8kB row size. >> > >> > Thanks, >> > Navin >> > >> > _______________________________________________ >> > 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]<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 IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you.
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