Hi Timo, As a general rule, never use any performance number from atomic mode. Atomic mode is for fast forwarding and warming (and for anything non-temporal). The only notion of time is ‘enough to not confuse the OS’.
I would recommend to re-run your experiment with a realistic timing core model (e.g. minor or arm_detailed), and a realistic DRAM controller (e.g. DDR3_1600_x64). I hope that explains it. Andreas On 16/07/2015 21:26, "gem5-users on behalf of Timo Schneider" <[email protected] on behalf of [email protected]> wrote: >Hi! > >I am running the stream benchmark[1] in GEM5 in SE, like this > >./build/X86/gem5.opt --debug-flags=ExecTicks ./configs/example/se.py >--mem-type=SimpleMemory -n 1 -c /gem5tests/stream > >The bandwidth reported is 2000 MB/s. Now if I run it on two CPUs in >parallel, like this > >./build/X86/gem5.opt --debug-flags=ExecTicks ./configs/example/se.py >--mem-type=SimpleMemory -n 2 -c /gem5tests/stream;/gem5tests/stream > >the reported bandwidth is still ~2000 MB/s, reported by both processes! >I expected it to be in the order of 1000 MB. The same happens with >different memory types, etc. > >Can someone explain why the memory bandwidth is not halved? > >Thank you! > > >_______________________________________________ >gem5-users mailing list >[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. ARM Limited, Registered office 110 Fulbourn Road, Cambridge CB1 9NJ, Registered in England & Wales, Company No: 2557590 ARM Holdings plc, Registered office 110 Fulbourn Road, Cambridge CB1 9NJ, Registered in England & Wales, Company No: 2548782 _______________________________________________ gem5-users mailing list [email protected] http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users
