Date: Mon, 22 Dec 2014 22:57:21 +0100 From: marcel@...wthinkers.net To: john-users@...ts.openwall.com Subject: Re: ARM exynos 5410 benchmark results In message <20141222203619.GA29434@...nwall.com>, Solar Designer writes: > > supposedly a 5V 2A supply will not work. This is something I have not > > tested. > > You'd need to measure the current before you test this, or you'd likely > burn the 2A PSU. I think I'll pass. There was a version of the board made that had power analysis built in (Odroid XU+E), finding someone with one of those would probably be easier. > > > I think you wrongly stated that you ran 8 threads. I think you > > > only ran 4. If so, please correct that little detail. > > > > Checked, and I did fill it out correctly. Total cores is 8 for this > > SoC, it's big.LITTLE. 4 x Cortex-a7 which can switch to 4 x Cortex-A15. > > > > So total cores turns out to be 8, with only 4 being active at > > any one time. > > Oh, I didn't realize you specified "4 / 8" rather than "8 / 4" (like we > would for a more typical system with multiple logical CPUs per core). > That's not how this notation was meant to be used, but it's a curious > extension we could consider for cases such as yours. I think it'd get > very confusing and ambiguous when those CPUs also start supporting > multiple threads per core, though. For example, what if your chip > supported 2 threads/core? Would you specify "8 / 8", because you'd run > 8 threads on 4 cores, and have another 4 cores idle (which would in fact > be the optimal way to use that chip)? But people would surely read this > as 8 threads running on 8 cores! So let's not go for those extensions. > I'll fix your entry to "4 / 4" now, because for our purposes the chip > has 4 cores. Fair enough, but keep in mind that things are about to get a lot more complicated. Have a look at https://www.linaro.org/blog/hardware-update/big-little-software-update/ for some of the things that are coming. Add to that the eventual (?) release of working OpenCL libs for these devices. - marcel
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