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Search: Posts Made By: ewmayer
Forum: Hardware 2021-06-11, 20:42
Replies: 183
Views: 25,718
Posted By ewmayer
On typical GIMPS wavefront/DC work, I get good...

On typical GIMPS wavefront/DC work, I get good Mlucas scaling up to 4 threads (1 per each of 4 physical cores), rapidly diminishing returns beyond that. Large-FFTs get better scaling at high core...
Forum: Flea Market 2021-06-03, 00:20
Replies: 0
Views: 319
Posted By ewmayer
4 Port VGA KVM Switch for $0 + shipping cost

See here (https://www.amazon.com/Wireless-Keyboard-Connection-Switching-Function/dp/B071Y6C516/) for details. I used for several months to manage my desktop PC and 3 crunching micro-PCs, worked...
Forum: Hardware 2021-06-01, 21:57
Replies: 57
Views: 2,734
Posted By ewmayer
Not to promote further straying-off-topic -...

Not to promote further straying-off-topic - "money: whence it came, where it went" (h/t John K. Galbraith) discussions should be continued in Soap Box - but thinking of money solely or mostly in...
Forum: Hardware 2021-05-30, 20:09
Replies: 57
Views: 2,734
Posted By ewmayer
Bitcoin rival Chia 'destroyed' hard disc supply...

Bitcoin rival Chia 'destroyed' hard disc supply chains, says its boss (https://www.newscientist.com/article/2278696-bitcoin-rival-chia-destroyed-hard-disc-supply-chains-says-its-boss/)

Even if one...
Forum: Software 2021-05-27, 00:50
Replies: 54
Views: 8,435
Posted By ewmayer
One of the reasons p = M61 is an attractive...

One of the reasons p = M61 is an attractive modulus for Mersenne-mod FGT(p^2) is that one can do several rounds of add/sub butterflies before having to mod-reduce. The wide-MULs of course are the...
Forum: GpuOwl 2021-05-26, 21:11
Replies: 30
Views: 5,707
Posted By ewmayer
Good suggestion - done.

Good suggestion - done.
Forum: Hardware 2021-05-25, 22:40
Replies: 183
Views: 25,718
Posted By ewmayer
Ordered 192GB = 6 x 32GB-per-dimm of RAM for my...

Ordered 192GB = 6 x 32GB-per-dimm of RAM for my KNL last night - the 2400MHz actually proved slightly cheaper (I walked both 2133 and 2400 through to checkout in separate-site shopping baskets), as...
Forum: GpuOwl 2021-05-25, 21:46
Replies: 30
Views: 5,707
Posted By ewmayer
@Simon - done, thanks - I put the clinfo-issue...

@Simon - done, thanks - I put the clinfo-issue fix in the Troubleshooting section of the OP.

16GB should be OK with just 1 instance running, but suggest watching progress through at least one p-1...
Forum: GPU to 72 2021-05-23, 22:12
Replies: 14
Views: 2,272
Posted By ewmayer
[We open our next scene with a hand slapping the...

[We open our next scene with a hand slapping the owner's forehead, accompanied by the utterance "doh!"]

Re above: In fact it seems silly to use powerful general-modulus factoring machinery like...
Forum: Mlucas 2021-05-22, 21:27
Replies: 28
Views: 2,632
Posted By ewmayer
For p-1 of current-wavefront (6M FFT) exponents,...

For p-1 of current-wavefront (6M FFT) exponents, that should allow you to cut 20-25% work off the minimum-memory option for my stage 2 implementation, depending on how much of it you allow stage 2 to...
Forum: PrimeNet 2021-05-20, 22:13
Replies: 6
Views: 391
Posted By ewmayer
Yes, but in e.g....

Yes, but in e.g. PRP=<aid>,1,2,3215747,-1,99,0,3,1..., 3 is the PRP base and 1 is the PRP-test (and cofactor-post-test) residue type, no? The OP said he changed the 3 to 5, which would give a base-5...
Forum: PrimeNet 2021-05-20, 20:21
Replies: 6
Views: 391
Posted By ewmayer
PRP-CF n00b here - why change the PRP base from 3...

PRP-CF n00b here - why change the PRP base from 3 to 5?
Forum: News 2021-05-17, 20:20
Replies: 11
Views: 3,155
Posted By ewmayer
I'm able to log in to e.g. amazon.co.uk and...

I'm able to log in to e.g. amazon.co.uk and amazon.de using same credentials as my usual US account - in fact I used the UK site just last week to order a used copy of an only-released-for-Region-2...
Forum: News 2021-05-17, 03:10
Replies: 11
Views: 3,155
Posted By ewmayer
I see it available in the UK...

I see it available in the UK (https://smile.amazon.co.uk/), so try prepending 'smile.' to whichever usual link you use for your country.
Forum: GPU to 72 2021-05-14, 22:36
Replies: 14
Views: 2,272
Posted By ewmayer
(Somehow missed this when PaulU OPed it:) ...

(Somehow missed this when PaulU OPed it:)



Ha! Real men (a.k.a. execrable masochists) factor numbers like this using the world's slowest bignum code - I mean of course *nix 'bc', which IIRC...
Forum: Mlucas 2021-05-11, 20:10
Replies: 28
Views: 2,632
Posted By ewmayer
How much RAM are you getting in your iMac? I...

How much RAM are you getting in your iMac? I really dislike the lack of RAM-expandability in the M1-based Apple offerings, as detailed in articles like this:

Theoretically, you can upgrade RAM &...
Forum: Mlucas 2021-05-10, 21:10
Replies: 28
Views: 2,632
Posted By ewmayer
Hi, Bayanne - tdulcet and danc2 have put together...

Hi, Bayanne - tdulcet and danc2 have put together a very nice auto-install-and-tune script, but that is alas Linux-only. But a simple DIY command-line build for Arm-based iMac is straightforward,...
Forum: Hardware 2021-05-07, 20:37
Replies: 183
Views: 25,718
Posted By ewmayer
I updated the current-prices table in my post...

I updated the current-prices table in my post above to add the officially supported 2133 DIMMs - as with 2400, the current sweet spot is at 16GB, one could buy 6 of those and thus max out the memory...
Forum: Hardware 2021-05-01, 21:43
Replies: 183
Views: 25,718
Posted By ewmayer
Of possible interest to our UK readers, a cheap...

Of possible interest to our UK readers, a cheap refurb 68C/272T 7250 KNL (https://www.ebay.com/itm/Intel-Xeon-Phi-7250-68-Core-272-Thread-CPU-Knights-Landing-/224307986087).

Priced some RAM...
Forum: Hardware 2021-04-18, 23:04
Replies: 83
Views: 3,761
Posted By ewmayer
Re. Hot-air-blowing: [hot by human standards] !=...

Re. Hot-air-blowing: [hot by human standards] != [hot by chipset standards].

The 2nd Radeon 7 GPU I added to my old ATX-case Haswell system (all case fans long-ago kaput, ventilation all via...
Forum: Hardware 2021-04-10, 23:02
Replies: 83
Views: 3,761
Posted By ewmayer
Less of a problem for Mike than most - he pays...

Less of a problem for Mike than most - he pays 1/3 as much for electricity in backwater Arkansas than I do in high-tech/woke/green/blahblah California.
Forum: Hardware 2021-04-04, 20:58
Replies: 15
Views: 651
Posted By ewmayer
Perhaps CADO-NFS, much like the GIMPS p-1...

Perhaps CADO-NFS, much like the GIMPS p-1 clients, is querying the system for available RAM and using some large fraction of that for efficiency reasons. Does the program have the equivalent of a...
Forum: PrimeNet 2021-04-02, 20:32
Replies: 6
Views: 1,151
Posted By ewmayer
A more interesting question is what the server...

A more interesting question is what the server does with the following kind of thing: A p-1 run found the following factor of M(109228331): 67043584777242522312784510096836476580550779917618449.
...
Forum: Software 2021-03-15, 20:07
Replies: 14
Views: 742
Posted By ewmayer
Table-lookup param-selection is coded up. Of the...

Table-lookup param-selection is coded up. Of the various curve-fits tried, polynomials seem ill-suited since the whole point of curve-fitting is to achieve significant data compression, by accurately...
Forum: Software 2021-03-14, 22:08
Replies: 14
Views: 742
Posted By ewmayer
I've uploaded a revised set2.txt with the...

I've uploaded a revised set2.txt with the duplicate at x = 25 removed. I probably have Excel-something on one of my Linux boxes, but can't afford more hours dicking around learning the basics of yet...
Showing results 1 to 25 of 1000

 
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