I'll mention that gem5 does have the foundation for parallelizing a single simulation across multiple cores; see for example http://repo.gem5.org/gem5/rev/2cce74fe359e. However, if you want to model a non-trivial configuration (i.e., one where there is communication between threads), then you have to insert synchronization, and that does limit your speedup, as Andreas has mentioned.
Steve On Tue, Aug 26, 2014 at 3:03 AM, Hussain Asad via gem5-users < gem5-users@gem5.org> wrote: > Thank you, Andreas > *moved to gem5-users :) > > > On Tue, Aug 26, 2014 at 8:39 AM, Andreas Hansson <andreas.hans...@arm.com> > wrote: > >> Hi Hussain, >> >> I’d suggest to ask on the gem5-users list for everyone’s benefit. >> >> Multi-threading invariably comes at a cost, and if you want to run say >> 10 experiments, they are embarrassingly parallel. As one of the main >> purposes of gem5 is design-space exploration most users will be running >> 10’s or 100’s of experiments. Thus, instead of making gem5 multi-threaded >> and “throwing performance away”, it is efficient as a single-threaded >> simulator, and I suggest to run your experiments in parallel to make use of >> your many cores/servers etc. >> >> Andreas >> >> From: Hussain Asad <x7xcloudstr...@gmail.com> >> Date: Tuesday, 26 August 2014 04:13 >> To: Andreas Hansson <andreas.hans...@arm.com> >> Subject: Gem5 on multiple cores >> >> Hi Andreas, >> >> I have a quick question, I am running gem5 build on a core i7 system, >> but gem5 uses just one core of the available 8(4cores +4threads). >> >> Is this feature not yet implemented or am I compiling the system not >> correctly, As I would assume if it was using all my CPU cores the >> simulation would be much faster. >> >> running gem5 on Ubuntu 14 LTS, core i7, 8GB of RAM at the moment, should >> I move my system to University servers would it be faster in a server >> system? >> >> Thanks >> Best Regards >> Hussain >> >> -- 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 > gem5-users@gem5.org > http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users >
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