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Old 2021-03-05, 20:36   #166
kriesel
 
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prime95 on Windows 10 gave mostly 2 cores/worker optimal, until reaching large exponents (~300M). But latency can be long compared to assignment expiration. See second attachment of https://www.mersenneforum.org/showpo...4&postcount=11 for prime95/win10 exhaustive benchmark, for comparison to any ubuntu/mprime results to follow.

Last fiddled with by kriesel on 2021-03-05 at 20:36
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Old 2021-03-05, 21:27   #167
ewmayer
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Quote:
Originally Posted by kriesel View Post
prime95 on Windows 10 gave mostly 2 cores/worker optimal, until reaching large exponents (~300M). But latency can be long compared to assignment expiration. See second attachment of https://www.mersenneforum.org/showpo...4&postcount=11 for prime95/win10 exhaustive benchmark, for comparison to any ubuntu/mprime results to follow.
Thanks, though as usual I needed reading glasses. :)

My own rule of thumb for manycore-system runs is to go with whichever combo has the fewest #workers and yields at least 95% of the maximum total throughput, to keep completion times reasonable.
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Old 2021-05-01, 21:43   #168
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Of possible interest to our UK readers, a cheap refurb 68C/272T 7250 KNL.

Priced some RAM modules, going to hold off for now, but do occasional price-checks, posting links here for reference.

From the SuperMicro mobo manual:
Quote:
The K1SPE has six (6) DIMM slots that can support 384 GB of Registered RDIMM up to 64 GB size and DDR4 2400 MHz speed, 1.20V SDRAM. See Chapter 5 for details.
(BIOS applicable settings related to memory: Memory Configurations -> Memory Map -> Channel Interleaving)
Recommended RAM modules: focus on DDR4 1.2V-2400, the fastest supported RAM frequency:
Code:
GB-Per-DIMM:	Recommended Modules:
 8:
	Samsung M393A1G40EB1-CRC	$50 per dimm
	Hynix HMA41GR7AFR4N-UH		$40 on Amzn
16:
	Samsung M393A2K40BB1-CRC	$73 on Amzn
	Samsung M393A2K40CB1-CRC	$80 on Amzn
	Hynix HMA42GR7AFR4N-UH		$65 on Amzn
	Hynix HMA82GR7AFR8N-UH		$85 on Amzn, but as low as $58 used [MicroMark had best price]
32:
	Samsung M393A4K40BB1-CRC	$157 on Amzn
	Samsung M393A4K40CB1-CRC	$172 on Amzn; this was the 1 module where the Sponsored-Ad top-placer in most of my DDG searches, Nemix.com, had the best price, $150
	Hynix HMA84GR7AFR4N-UH		$157 on Amzn
64:
	Samsung M386A8K40BM1-CRC4Q	$297 on Amzn
	Micron MTA72ASS8G72LZ-2G3B2	$298 on eBay, $350 on Amzn

Last fiddled with by ewmayer on 2021-05-03 at 00:36
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Old 2021-05-01, 23:34   #169
Uncwilly
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Quote:
Originally Posted by ewmayer View Post
Of possible interest to our UK readers, a cheap refurb 68C/272T 7250 KNL:
That sold days ago.

Last fiddled with by ewmayer on 2021-05-02 at 03:06 Reason: Still sets a price level...
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