I think Linux boot is pretty reasonable. Or, Linux boot + some multithreaded tests (parsec is available for x86 in gem5-resources). If there isn't much performance impact there, I think that would be strong evidence for little performance impact, generally.
Cheers, Jason On Mon, Oct 5, 2020 at 3:07 AM Gabe Black via gem5-dev <gem5-dev@gem5.org> wrote: > Hey folks. I'm trying out using dynamically allocated arrays to track > source and destination register indices in static and dynamic instructions > rather than fixed size arrays and would like to check what the impact on > performance is. I used to use the twolf SPEC benchmark for that since it > was fairly quick and easy to run but still ran long enough to get > meaningful results, but do we have something like that now that's maybe > even easier to set up? Or is easier for other people to run? > > As far as the arrays, what I'm aiming at is to make it unnecessary to > measure the max number of indices needed and hence the minimum size of > those arrays since that centralized global value needs to reflect every > instruction in gem5, and it would be a bit of a pain to coordinate that > with multiple ISAs. Allocating those arrays statically as part of the > StaticInst or DynInst classes makes allocation cheaper since it just makes > the classes a little bigger, and making them dynamic will inevitably > involve secondary allocations to give the vectors (for instance) their > backing store. I'm hopeful it won't be that bad though, since StaticInsts > are usually reused from a cache and not reallocated, and dynamic > instructions are used in CPUs which already have lots of other, more > substantial overhead. > > Gabe > _______________________________________________ > gem5-dev mailing list -- gem5-dev@gem5.org > To unsubscribe send an email to gem5-dev-le...@gem5.org > %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s
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