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If you're using a GPU for other tasks, it may be beneficial to leave hyperthreading on in the BIOS and instead tell BOINC to use 50% of the CPU's.

If you have an Intel CPU with hyperthreading, either turn off the hyperthreading in the BIOS, or set BOINC to use 50% of the processors.

Before the challenge starts, take some time and experiment and see what works best on your computer. Those looking to maximise their computer's performance during this challenge, or when running LLR in general, may find this information useful. Multi-threading optimisation instructions Please, please, please make sure your machines are up to the task. If you have certain recent Intel Skylake-X and Xeon CPUs, especially if it's overclocked or has overclocked memory, and haven't run the new AVX-512 LLR before, we strongly suggest running it before the challenge while you are monitoring the temperatures. It's faster than the previous LLR app and draws more power and produces more heat.

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Note that PPS-DIV is running the latest AVX-512 version of LLR which takes full advantage of the features of these newer CPUs.

Highly overclocked Haswell, Broadwell, Skylake, Kaby Lake or Coffee Lake (i.e., Intel Core i7, i5, and i3 -4xxx or better) computers running the application will see fastest times. Sieving is an excellent alternative for computers that are not able to LLR. If your computer is highly overclocked, please consider 'stress testing' it. Tasks on one CPU core will take 2 hours on fast/newer computers and 5 hours+ on slower/older computers. It does not tolerate 'even the slightest of errors.' Please see this post for more details on how you can 'stress test' your computer. Intel CPUs with FMA3 capabilities (Sandy Bridge, Ivy Bridge, Haswell, Broadwell, Skylake, Kaby Lake, Coffee Lake) will have a very large advantage, and Intel CPUs with dual AVX-512 (certain recent Intel Skylake-X and Xeon CPUs) will be the fastest.ĪTTENTION: The primality program LLR is CPU intensive so, it is vital to have a stable system with good cooling.

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The challenge will begin 10th October 2019 18:00 UTC and end at 15th October 2019 18:00 UTC.Īpplication builds are available for Linux 32 and 64 bit, Windows 32 and 64 bit and MacIntel. To participate in the Challenge, please select only the Fermat Divisor Search LLR (PPS-DIV) project in your PrimeGrid preferences section. It focuses on making mathematics interesting while also giving them an opportunity to win prizes and scholarships.

The challenge is being offered on the new Fermat Divisor Search (PPS-DIV) (LLR) application.Ĭelebrated on October 15th each year, World Maths Day encourages students globally to take a break from standard math lessons giving them the opportunity to enjoy the beauty of mathematics by participating in maths-themed competitions, quizzes and games.

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The seventh Challenge of the 2019 Challenge series is a 5 day challenge to celebrate World Maths Day. If you are not using graphics enabled BOINC client, you may use.Select which subprojects to run via the.

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