Posts by Curious
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1)
Message boards :
Number crunching :
Optimized app ?
(Message 623)
Posted 1 Nov 2015 by Curious Post: It varies from CPU to CPU: on my system (a laptop pc) it works as I said. On your system (which I assume is a desktop pc) it works as you said. If you don't believe me, I don't care but surfing the web one finds out that some people see better results with SSEx than AVXx in some projects (not only DENIS). The only thing to do to be sure is to try by ourselves. |
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2)
Message boards :
Number crunching :
Optimized app ?
(Message 620)
Posted 1 Nov 2015 by Curious Post: I assume you don't know about Crunch3r's SSE4.1 app version. This is the one I'm referring to (not sesef's SSE3 one): it's two times faster than AVX2 on my CPU when running one WU at a time without any other application (distributed computing nor not-DC) so no throttling at all. I know it's a really simple scenario but it allows you to understand things easily. Sure enough on other CPUs it will perform differently than my Haswll CPU with Hyper Threading and factory power limitation (which I removed through Intel extreme tuning utility though), but I wrote it clearly that I was referring to my particular case. EDIT Corrected typos |
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3)
Message boards :
Number crunching :
Optimized app ?
(Message 615)
Posted 1 Nov 2015 by Curious Post: Yes, in Asteroids@Home message boards they briefly explain why AVX isn't suggested for CPU with Hyper Threading, see here. Moreover on Primegrid message boards is pointed out that simulating a duble number of cores causes the chip to produce more heat. I've noticed that AVX2 is significantly slower than SSE4.1 on my HT Intel (Haswell) CPU too. EDIT URL added |
