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https://www.hardwareluxx.de/community/f11/ryzen-schach-performance-bmi2-problem-1156117.htmlhttps://github.com/lantonov/asmFish/wiki/Change-log2018-04-26 Fix for Large Pages (asm). bench 5643520
> Reload rcx register prior to calling OS_VirtualAlloc. This patch should prevent the rcx register
> from getting clobbered and therefore restore the functionality of LP in asmFish.
> See discussion at issue #160 for more details.
https://github.com/lantonov/asmFish/issues/160 tthsqe12 commented Apr 25, 2018
> Haha i can reproduce the crash. It seems to happen at least when large pages are
> requested but not available. Should be easy to fix.
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> Damit das System large pages erlaubt, muss man in den group policies das Recht
> für "lock pages in memory" aktivieren und UAC deaktivieren oder die engine als
> Administrator laufen lassen.
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> Danke, damit ist das popcnt Problem erklärt. Die beiden Befehle PDEP und PEXT werden zwar soweit ich weiß
> nur in der Erzeugung der möglichen Züge verwendet, aber bei der mageren Performance sollte man die dann
> tunlichst meiden. Interessanterweise sinkt übrigens der Stromverbrauch entsprechend, wenn man die
> BMI2 Versionen verwendet. AVX2 soll ja auch nicht überzeugend sein - da dürfte auch der Grund liegen,
> weshalb die neuen Prime Versionen zuwenig Last erzeugen.
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> Folks should note that using LP will put that much more stress to their CPUs
> (the same as additional overclock) i.e. higher temps.
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> Enabling large pages with the pro versions of Windows is relatively simple. For W10 just follow the
> instructions in this thread:
http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=17033 > But disabling UAC doesn't do the job, you'll have to run your engine as administrator.
> Using the home versions of Windows makes things more tricky.
> Please try this:
http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?pid=259791#pid259791 > But I don't know if that also works for W10.
> How much speed increase by enabling large pages - Depends on the hash size - up to 20%.
> More than you gain by overclocking.
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> increase in power consumption is less than what you gain.
> startposition +15% on a threadripper with largepages