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Search: Posts Made By: ewmayer
Forum: Data 2022-05-25, 22:34
Replies: 110
Views: 6,392
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: 1,932
RIP
Views: 219,974
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: 7,487
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: 7,487
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: 11,806
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: 34,640
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: 34,640
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: 1,932
RIP
Views: 219,974
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: 7,460
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: 95,587
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: 1,912
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: 1,912
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: 1,912
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: 1,912
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: 1,912
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: 1,912
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: 1,912
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: 41,798
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)...
Forum: Mlucas 2022-03-20, 19:29
Replies: 27
Views: 3,651
Posted By ewmayer
Small patch uploaded - The bug only manifests for...

Small patch uploaded - The bug only manifests for users doing PRP tests and who have set CheckInterval = 1000, the minimal allowable value, in their mlucas.ini file. (Such a low value is not...
Forum: GPU Computing 2022-03-17, 21:09
Replies: 45
Views: 7,460
Posted By ewmayer
Several years ago, in conjunction with the...

Several years ago, in conjunction with the discussion in this thread, I hacked together a float32 version of the then-current Mlucas version, managed to get it mostly working, but more-pressing...
Forum: Lounge 2022-03-16, 02:15
Replies: 373
Views: 45,105
Posted By ewmayer
100th anniversary of the Berlin premiere...

100th anniversary of the Berlin premiere F.W.Murnau's Nosferatu. Wikipedia:
Forum: Mlucas 2022-03-13, 22:56
Replies: 27
Views: 3,651
Posted By ewmayer
@tdulcet: I saw the thread in question and had a...

@tdulcet: I saw the thread in question and had a look at what happens with such fractional-test-saved assignment. Long story short - there should be no problem for Mlucas users.

Step-through debug...
Forum: Mlucas 2022-03-07, 19:55
Replies: 27
Views: 3,651
Posted By ewmayer
That's a developer-only flag I used to help gauge...

That's a developer-only flag I used to help gauge performance of various stage 2 prime-pairing-related settings during my algorithm development work, by way of counting modmuls without actually doing...
Forum: Hardware 2022-03-05, 20:38
Replies: 244
Views: 48,737
Posted By ewmayer
Lack of keyboard-based minimize on my Ubuntu...

Lack of keyboard-based minimize on my Ubuntu desktop (my main Linux work-managment machine - all others are remote-access) also bugged me - at least under Ubuntu/Gnome, "option-h" (where 'option' is...
Forum: Hardware 2022-03-04, 19:40
Replies: 11
Views: 1,183
Posted By ewmayer
I'm not familiar with the details of the apparent...

I'm not familiar with the details of the apparent difference in running mprime in avx-512 vs fma3 mode. Could you enlighten? My own code makes no such distinction, because AFAIK no Intel CPUs have...
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