Non-determinism comes from the FS simulation. You could try pinning the software threads to the hardware threads. The miss rate varies because of the dynamic behaviour of the synchronization primitives such as barriers and locks.
On Wed, Sep 10, 2014 at 9:50 PM, Andreas Hansson via gem5-users < gem5-users@gem5.org> wrote: > Hi Nizam, > > Could you elaborate on what is changing between the runs? > > The simulator is deterministic, so if everything stays the same you will > get exactly the same output (otherwise we would never be able to run any > regressions the way we do). > > Andreas > > From: Nizamudheen Ahmed via gem5-users <gem5-users@gem5.org> > Reply-To: Nizamudheen Ahmed <nizam.ah...@gmail.com>, gem5 users mailing > list <gem5-users@gem5.org> > Date: Wednesday, 10 September 2014 16:50 > To: gem5 users mailing list <gem5-users@gem5.org> > Subject: [gem5-users] non-determinism in GEM5 stats > > Hi champs, > > I observe the stats.txt contain alarmingly different data across multiple > run of the same benchmark under same target configuration. For example, i > get 17% miss-rate and 5% miss-rate across two different runs. > > Can you help me identifying what could be going wrong? > > I have checkpointed the Linux boot and i am attempting to run PARSEC > benchmark (blackscholes to be precise) ARM ISA. I also use m5::reset_stats > and m5::dump_and_reset_stats around the ROI (i instrumented the hook.c in > the PARSEC to invoke these calls). > > Thanks. > > Best regards, > Nizam > > > -- 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 > -- *thanks®ards* *BISWABANDAN* http://www.cse.iitm.ac.in/~biswa/ “We might fall down, but we will never lay down. We might not be the best, but we will beat the best! We might not be at the top, but we will rise.”
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