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Search: Posts Made By: ewmayer
Forum: Hardware 2022-06-24, 23:03
Replies: 248
Views: 50,598
Posted By ewmayer
After crunching hard for 18 months, my...

After crunching hard for 18 months, my bargain-refurb KNL workstation went "boink" at beginning of May. Suspect the MoBo - possibly the CPU - but after a fair bit of fruitless attempted fault-tracing...
Forum: Flea Market 2022-06-24, 22:57
Replies: 0
Views: 50
Posted By ewmayer
6 x 32GB Samsung-Compatible DDR4-2400 ECC Registered Server RAM

Samsung 32GB M393A4K40CB1-CRC DDR4-2400 ECC RDIMM 2Rx4 OEM Compatible Registered Server RAM (6 Sticks available)

$89.95 each or all 6 sticks for $500

These were pulled out of an Intel...
Forum: Soap Box 2022-06-20, 22:26
Replies: 5
Views: 645
Posted By ewmayer
Yahoo! Finance explains why Crypto is not merely...

Yahoo! Finance explains why Crypto is not merely a massively more environmentally destructive techno-iteration of Tulip mania (the italicized snip is literal-copy from the Yahoo headlines section of...
Forum: Mlucas 2022-06-16, 21:58
Replies: 25
Views: 2,270
Posted By ewmayer
Interesting, thanks. Do you now have 2...

Interesting, thanks. Do you now have 2 production-run instances running on the respective 4-core subsets, and if so, what are the respective exponents/runtimes? On Galaxy S7 with its hybrid quadcore...
Forum: Lounge 2022-06-01, 18:32
Replies: 30
Views: 2,124
Posted By ewmayer
Good question - I think a good guide is "does the...

Good question - I think a good guide is "does the proposed construction make sense when applied to a similar common-usage word?" E.g. for the 'e'xample, substitute 'weight' for 'effervescence'. We...
Forum: Lounge 2022-05-31, 22:14
Replies: 30
Views: 2,124
Posted By ewmayer
e[7]: effervescencelessness (e.g. "The...

e[7]: effervescencelessness
(e.g. "The effervescencelessness of the champagne indicated to me that the bottle had been opened some time ago.")
Forum: Lounge 2022-05-31, 19:01
Replies: 4,466
Views: 421,411
Posted By ewmayer
There's also a flip side to this sort of story: ...

There's also a flip side to this sort of story:

Accused of Cheating by an Algorithm, and a Professor She Had Never Met...
Forum: Data 2022-05-25, 22:34
Replies: 110
Views: 7,256
Posted By ewmayer
Arrow Using the 3 now-known factors - a quite...

Using the 3 now-known factors - a quite impressive collection - the cofactor is still composite [C11008], so this is no time to rest on your laurels. :)
Forum: Lounge 2022-05-19, 20:58
Replies: 1,936
RIP
Views: 225,963
Posted By ewmayer
His music for The Bounty...

His music for The Bounty (https://en.wikipedia.org/wiki/The_Bounty_%281984_film%29) was also surprisingly effective in a very nontraditional way. Underrated film IMO, very checkered development...
Forum: FermatSearch 2022-05-14, 21:26
Replies: 14
Views: 8,359
Posted By ewmayer
Thanks, Andreas (and Luigi). Yes, 'type 5'...

Thanks, Andreas (and Luigi).

Yes, 'type 5' is the GIMPS jargon - same as type 1, i.e. a Fermat-PRP, a^(N-1) (mod N), but followed by the Suyama-style cofactor-PRP step. The...
Forum: FermatSearch 2022-05-13, 22:29
Replies: 14
Views: 8,359
Posted By ewmayer
F25-F30 cofactor status

[By way of cross-referencing]

I just posted details/results for my tests of the F25-F30 cofactors here (https://www.mersenneforum.org/showthread.php?p=605833#post605833). Executive Summary:

o...
Forum: Factoring 2022-05-13, 22:16
Replies: 73
Views: 12,271
Posted By ewmayer
OK, so it took a little bit longer...

OK, so it took a little bit longer (https://www.mersenneforum.org/showthread.php?p=605833#post605833) - but from F25 all the way through F30, the latter having required roughly 100x the compute...
Forum: Computer Science & Computational Number Theory 2022-05-13, 22:05
Replies: 82
Views: 36,062
Posted By ewmayer
F25-F30 cofactor status, Part 2

In each case I begin with a quick Pépin-test residue sanity check, summarized here:

In the results below, for each prime factor, 'A: R == ' is the full residue (mod p) and 'B: R ==' is the (mod p)...
Forum: Computer Science & Computational Number Theory 2022-05-13, 21:54
Replies: 82
Views: 36,062
Posted By ewmayer
F25-F30 cofactor status, Part 1

[I PMed a more-or-less-identical draft of this to Prime95, ATH; yorix, jasonp, philmoore and R. Gerbicz yesterday]

F25-F30 cofactor status:

In the context of testing the cofactor-PRP...
Forum: Lounge 2022-05-08, 23:55
Replies: 1,936
RIP
Views: 225,963
Posted By ewmayer
Ghost_of_Kyiv...

Ghost_of_Kyiv (https://en.wikipedia.org/wiki/Ghost_of_Kyiv) | Wikipedia

But while we're on the topic of glue-sniffing, don't let that stop anyone from running out and buying the commemorative...
Forum: GPU Computing 2022-04-18, 19:08
Replies: 45
Views: 7,701
Posted By ewmayer
@Magellan3s: What about int32 performance vs...

@Magellan3s: What about int32 performance vs float32? I'm guessing much of the TF code uses that.

No need for big specs-tables dumps, just the rundown of int32 vs float32 for various GPUs of...
Forum: GPU Computing 2022-04-09, 20:16
Replies: 374
Views: 97,544
Posted By ewmayer
2 of the 3 R7s in my 3-GPU open-frame desktop rig...

2 of the 3 R7s in my 3-GPU open-frame desktop rig have been nonfunctional since last fall due to issue detailed in the copied-below e-mail thread between myself and Mike/Xyzzy.

I am trying to find...
Forum: GMP-ECM 2022-04-01, 22:36
Replies: 24
Views: 2,172
Posted By ewmayer
I refer to all such compressed-tarchives of e.g....

I refer to all such compressed-tarchives of e.g. my Mlucas code as "release tarballs" - but finally got the one named so under the 4 you mention, building now. Thx!

Update: Build/test/install...
Forum: GMP-ECM 2022-04-01, 21:26
Replies: 24
Views: 2,172
Posted By ewmayer
Thanks - got a little further before hitting the...

Thanks - got a little further before hitting the next missing build component (I also copied both your files to the new ecm-7.0.4 dir, fails there the same way):

[ewmayer@localhost ecm-master]$...
Forum: GMP-ECM 2022-04-01, 20:52
Replies: 24
Views: 2,172
Posted By ewmayer
Sorry - too much orthogonal advice flying around....

Sorry - too much orthogonal advice flying around. Just grabbed the 7.0.4 release, still don't see the above files:
[ewmayer@localhost ~]$ tar xjf ecm-7.0.4.tar.bz2
[ewmayer@localhost ~]$ ll |grep...
Forum: GMP-ECM 2022-04-01, 20:12
Replies: 24
Views: 2,172
Posted By ewmayer
Thanks - that needs at least one other...

Thanks - that needs at least one other install-script:

configure: error: cannot find install-sh, install.sh, or shtool in "." "./.." "./../.."
Forum: GMP-ECM 2022-04-01, 18:47
Replies: 24
Views: 2,172
Posted By ewmayer
Yeah, don't we wish: [ewmayer@localhost ~]$...

Yeah, don't we wish:

[ewmayer@localhost ~]$ sudo dnf install autoconf
[sudo] password for ewmayer:
CentOS-8 - AppStream ...
Forum: GMP-ECM 2022-04-01, 00:12
Replies: 24
Views: 2,172
Posted By ewmayer
Where is 'autoreconf" supposed to be? Is that a...

Where is 'autoreconf" supposed to be? Is that a command in some Linux distros, or a gmp-ecm script? I don't see either on my CentOS system:

[ewmayer@localhost ecm-master]$ autoreconf -i
bash:...
Forum: GMP-ECM 2022-03-31, 22:55
Replies: 24
Views: 2,172
Posted By ewmayer
That's where Paul and I got the source just now,...

That's where Paul and I got the source just now, only to find after unpacking it, that the 'configure' file is missing:
[ewmayer@localhost ~]$ ll ecm-master
total 2468
-rw-rw-r--. 1 ewmayer...
Forum: Hardware 2022-03-30, 18:32
Replies: 185
Views: 42,637
Posted By ewmayer
I see Odroid N2 and N2+ with 4GB RAM (but...

I see Odroid N2 and N2+ with 4GB RAM (but typically sans PSU and eMMC module) selling for under $100 at various sites including eBay, Amazon and here (https://ameridroid.com/products/odroid-n2-plus)...
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