Hi everyone, Is there any new effort in making this parallelization work for arbitrary multi-core systems (e.g scaling the number of threads/EQs according to the number of cores in the simulated system) ?
Regards, Tiago On Tue, Aug 26, 2014 at 9:07 AM, Steve Reinhardt via gem5-users < gem5-users@gem5.org> wrote: > 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 >> > > > _______________________________________________ > gem5-users mailing list > gem5-users@gem5.org > http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users >
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