Hi George,
First of all, not that the “--mem-size” you pass to gem5 only affects the
memory seen by the OS, not the actual DRAM configuration. We have recently
added a warning to highlight any discrepancy for the user when using the native
gem5 DRAM controller.
When it comes to your specific question, if you use the native DRAM controller
(faster and more tightly integrated with gem5), you can change the number of
channels on the command line, and add new memory types if you want to change
the number of ranks. Just subclass one of the existing memory classes in
src/mem/DRAMCtrl.py.
For DRAMSim2, there is no integration besides some basic checks on the access
granularity. Thus, you have to modify the ini file passed to the DRAMSim2
wrapper if you want to go down this route.
Andreas
From: George Michelogiannakis via gem5-users
<[email protected]<mailto:[email protected]>>
Reply-To: George Michelogiannakis
<[email protected]<mailto:[email protected]>>, gem5 users mailing
list <[email protected]<mailto:[email protected]>>
Date: Monday, October 6, 2014 at 7:35 PM
To: Gem5 Users Mailing List <[email protected]<mailto:[email protected]>>
Subject: [gem5-users] Memory size with DRAMSim2
Hi all,
when I run gem5 with dramsim2, what is the easiest way to increase the memory
size? Should I increase the number of channels in DRAMSim2's config, or use a
parameter in gem5 that'll trickle down to DRAMSim2 to increase the number of
ranks?
Thank you,
George M
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