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These are no longer split out and shared in the root build/ directory. This does result in a small amount of overhead from building redundant copies of these files, although the overhead is not significant. When building 7 different variants of gem5, all the ISAs and NULL, the difference on my machine was: Before: real 41m25.372s user 914m22.266s sys 41m51.816s After: real 42m38.074s user 921m36.852s sys 43m2.949s This is about a 2-3% difference, which is a worse than typical case, since the overhead scales with the number of variants being built. The benefit of pulling ext/ into the variant directory is that there can now be a single config which applies to all files used to build gem5, and that config is represented by the variant of gem5 being built. Change-Id: I6f0db97c63a7f3e252e7e351aa862340978e701b Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/56750 Maintainer: Gabe Black <gabe.black@gmail.com> Tested-by: kokoro <noreply+kokoro@google.com> Reviewed-by: Gabe Black <gabe.black@gmail.com>
Follow these steps to get DRAMSim2 as part of gem5
1. Download DRAMSim2
1.1 Go to ext/dramsim2 (this directory)
1.2 Clone DRAMSim2: git clone git@github.com:umd-memsys/DRAMSim2.git
2. Compile gem5
2.1 Business as usual
3. Run gem5 with DRAMSim2
3.1 Use --mem-type=dramsim2 and set the device and system configuration