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Forum: GpuOwl 2021-11-30, 02:23
Replies: 200
Views: 26,255
Posted By kriesel
help output excerpt (note the zero values for...

help output excerpt (note the zero values for upper limits) from gpuowl-win V7.2-86

FFT Configurations (specify with -fft <width>:<middle>:<height> from the set below):
FFT 256K [ 1.57M - ...
Forum: MattcAnderson 2021-11-30, 01:15
Replies: 9
Views: 165
Posted By kriesel
Pt-Ni or Pt-Ni-Cu...

Pt-Ni or Pt-Ni-Cu https://samueli.ucla.edu/longer-lasting-catalysts-to-improve-fuel-cells/
Pt-free Fe-N-C https://www.anl.gov/article/platinumfree-catalysts-could-make-cheaper-hydrogen-fuel-cells...
Forum: MattcAnderson 2021-11-29, 23:30
Replies: 9
Views: 165
Posted By kriesel
Bronze and brass and other alloys are metals,...

Bronze and brass and other alloys are metals, including those with minor ingredients considered nonmetallic (carbon, sulfur, phosphorus, nitrogen etc). Most metal used in industry is an intentional...
Forum: Operation Billion Digits 2021-11-29, 17:31
Replies: 16
Views: 9,224
Posted By kriesel
Misc. updates

There is a November 28 patch (https://mersenneforum.org/showpost.php?p=594124&postcount=12) for Mlucas v20.1.1 (https://www.mersenneforum.org/mayer/README.html).
Mersenne.ca is now accepting P-1...
Forum: Operation Billion Digits 2021-11-29, 17:24
Replies: 16
Views: 9,224
Posted By kriesel
Qualification (#1 "roa")

Run time scaling completed twice, from 10M to 500M or higher plus short stage 1 OBD interim timing, yields multiple extrapolations to OBD GPU72 bounds P-1 both stages completion within one year of...
Forum: Miscellaneous Math 2021-11-29, 05:39
Replies: 429
Views: 39,839
Posted By kriesel
s/up/down/

s/up/down/
Forum: GpuOwl 2021-11-28, 20:45
Replies: 28
Views: 10,217
Posted By kriesel
gpuowl-win v7.2-86-gddf3314

As usual, build-log.txt separate, everything else in the compressed file. Have not tested it much myself, only generating the help output to a file. Adds middle 2 fft, etc.
Forum: Data 2021-11-28, 16:35
Replies: 3,483
Views: 312,521
Posted By kriesel
Historically, overall, January and September have...

Historically, overall, January and September have been most productive.

From https://www.mersenne.org/primes/, sorted by day of year;
Mp#35 1996 Nov 13
Mp#39 2001 Nov 14
Mp#40 2003 Nov 17...
Forum: kriesel 2021-11-28, 16:18
Replies: 6
Views: 3,976
Posted By kriesel
Discovery dates

Discovery dates can be found at https://www.mersenne.org/primes/. Other than patterns such as varying computer usage & shutdown at U of Central Missouri and elsewhere, relating to academic year...
Forum: Math 2021-11-27, 13:35
Replies: 8
Views: 201
Posted By kriesel
I thought later after I posted that, that seed >...

I thought later after I posted that, that seed > Mp or Mp2 would be some sort of problem. But it seems to work, at least in a very small sample tried.
The wikipedia article should be updated if it's...
Forum: Math 2021-11-27, 00:35
Replies: 8
Views: 201
Posted By kriesel
https://en.wikipedia.org/wiki/Lucas%E2%80%93Lehmer...

https://en.wikipedia.org/wiki/Lucas%E2%80%93Lehmer_primality_test#Alternate_starting_values states there are an infinite number of universal starting values.

The ninth page of Bas Jensen's PhD...
Forum: Lounge 2021-11-26, 12:55
Replies: 1,527
Views: 160,716
Posted By kriesel
New variant concerning, leading to a new round of...

New variant concerning, leading to a new round of travel bans
https://science.thewire.in/health/b-1-1-529-britain-says-new-sars-cov-2-variant-is-most-significant-yet-found/
Forum: Hardware 2021-11-25, 03:25
Replies: 29
Views: 2,564
Posted By kriesel
Why LL with its inferior error checking and full...

Why LL with its inferior error checking and full 100%+ cost DC, not PRP with GEC and proof generation and ~0.5% certification cost?
Forum: Mlucas 2021-11-24, 23:05
Replies: 12
Views: 756
Posted By kriesel
No. Mersenne & Fermat numbers; P-1 LL PRP, & P-1...

No. Mersenne & Fermat numbers; P-1 LL PRP, & P-1 Pepin test respectively.
https://www.mersenneforum.org/showpost.php?p=488291&postcount=2...
Forum: Astronomy 2021-11-24, 19:24
Replies: 29
Views: 2,572
Posted By kriesel
https://www.youtube.com/watch?v=7IjgZGhHrYY A...

https://www.youtube.com/watch?v=7IjgZGhHrYY
A payload (http://www.sal.wisc.edu/WUPPE/) the UW-Madison produced missed the Challenger disaster...
Forum: GPU Computing 2021-11-24, 19:16
Replies: 6
Views: 168
Posted By kriesel
See also this post...

See also this post (https://www.mersenneforum.org/showpost.php?p=488292&postcount=3) in the reference info compilation (https://mersenneforum.org/showthread.php?t=24607).
Forum: GPU Computing 2021-11-23, 19:10
Replies: 3,519
Views: 450,884
Posted By kriesel
Try an explicitly CUDA10.x build of mfaktc. It's...

Try an explicitly CUDA10.x build of mfaktc. It's possible the CUDA11.2 mfaktc build (CC 8.6) did not include the optional downlevel compute capability levels such as CC 7.5. See...
Forum: Hardware 2021-11-23, 14:11
Replies: 8
Views: 290
Posted By kriesel
Ebay...

Ebay (https://www.ebay.com/sch/i.html?_from=R40&_nkw=xeon+phi&_sacat=175673&_sop=15) currently has some 5110P coprocessors for under $100; in one case = $40 US. For experimentation on a budget.
Forum: Hardware 2021-11-23, 01:53
Replies: 8
Views: 290
Posted By kriesel
per https://en.wikipedia.org/wiki/Xeon_Phi...

per https://en.wikipedia.org/wiki/Xeon_Phi content: (https://en.wikipedia.org/wiki/Xeon_Phi:)
Knights Corner ram is GDDR5 ECC (no provision for DIMM, or any other expansion) as PCIe coprocessor...
Forum: Hardware 2021-11-22, 21:10
Replies: 8
Views: 290
Posted By kriesel
I have a 7120A, which is PCIe coprocessor not...

I have a 7120A, which is PCIe coprocessor not installed ATM. Estimated 1/3 throughput of a 7210. Limited and fixed max ram would cost P-1 performance at normal exponents, preclude past ~1G....
Forum: chalsall 2021-11-22, 19:44
Replies: 26
Views: 472
Posted By kriesel
Compare the damage at 75MPH in the recent...

Compare the damage at 75MPH in the recent instance and damage at 55MPH! in the previous storm, to the design requirements easily found by web search in...
Forum: GPU Computing 2021-11-22, 18:20
Replies: 3,519
Views: 450,884
Posted By kriesel
Run mfaktc with the -info option. Output should...

Run mfaktc with the -info option. Output should look something like the following, which works. Check the bolded part below. (Underlined stuff can vary.) Mismatch between runtime version (dll) and...
Forum: GPU Computing 2021-11-22, 18:02
Replies: 3,519
Views: 450,884
Posted By kriesel
Win10 pro should not be an issue. Some older OS...

Win10 pro should not be an issue. Some older OS versions (Vista, XP) can be due to limits on driver availability for newer GPUs. Or occasionally an old CPU is not compatible with a new driver, or any...
Forum: chalsall 2021-11-22, 16:19
Replies: 26
Views: 472
Posted By kriesel
Wind and solar generation are inherently big...

Wind and solar generation are inherently big exposed installations vulnerable to damage by flying objects (trees, cows, vehicles, fragments of destroyed buildings, etc.) and becoming flying debris...
Forum: mersenne.ca 2021-11-22, 15:13
Replies: 721
Sticky: mersenne.ca
Views: 96,793
Posted By kriesel
I believe it must change the factor finding...

I believe it must change the factor finding probability to change the exponent. f=2kp+1. For larger p, fewer potential factors fit in the bounds. That's the broader trend. For small delta p,...
Showing results 1 to 25 of 1000

 
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