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Forum: Hardware 2021-05-01, 21:43
Replies: 168
Views: 22,175
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: 65
Views: 2,147
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: 65
Views: 2,147
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: 441
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: 1,022
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: 598
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: 598
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...
Forum: GPU Computing 2021-03-14, 03:33
Replies: 365
Views: 66,820
Posted By ewmayer
Winning bid was $1226 and change - I wonder if...

Winning bid was $1226 and change - I wonder if the seller actually ends up getting paid.

Based on the ad wording, seems like a genuine gamer-with-a-gripe taking out his frustrations in a creative...
Forum: Software 2021-03-13, 21:14
Replies: 14
Views: 598
Posted By ewmayer
I was curious whether any nonlinear curve-fit...

I was curious whether any nonlinear curve-fit software readers brought to bear would be able to take the partial point sets - complete at the left end, where the 'action' is, then just a far-right...
Forum: Software 2021-03-12, 23:11
Replies: 14
Views: 598
Posted By ewmayer
Nonlinear curve fits needed

I am working on adding p-1 factoring support to Mlucas v20 - This is related to choosing optimal Stage 2 parameters. I have 2 (x,y)-point datasets for which I need high-quality nonlinear curve fits....
Forum: Cloud Computing 2021-03-09, 20:53
Replies: 77
Views: 4,641
Posted By ewmayer
Possible issue - how to handle savefile...

Possible issue - how to handle savefile incompatibility between client versions? This is not just an issue for gpuowl, but I got dinged by it when I upgraded my build of that client on one of my...
Forum: PrimeNet 2021-03-08, 21:43
Replies: 15
Views: 719
Posted By ewmayer
Ah, you're doing 100Mdigit work - I don't know...

Ah, you're doing 100Mdigit work - I don't know what the default p-1 protocol for those is supposed to be. PMing George to see if he can clarify.
Forum: PrimeNet 2021-03-08, 20:21
Replies: 15
Views: 719
Posted By ewmayer
Which program are you using? If gpuowl, it's been...

Which program are you using? If gpuowl, it's been doing a combined p-1 stage 1 and first-few-%-of-PRP since v7. That means that such a run starts out looking like a PRP, but the first few Miterations...
Forum: Mlucas 2021-03-08, 20:01
Replies: 1
Views: 297
Posted By ewmayer
M107353937 proved a bit too large to handle @5.5M...

M107353937 proved a bit too large to handle @5.5M FFT, even with the newly-reinstated HIACC carry code - here are the ROEs > 0.4375 hit in the first half-million iterations (I omit the 0.4375 ones,...
Forum: Mlucas 2021-03-07, 23:51
Replies: 1
Views: 297
Posted By ewmayer
Mlucas v20: Preview of coming detractions, or something :)

As I've noted elsewhere, v20 will have p-1 factoring support as its major feature add, with some details such as "fused p-1 stage 1 and PRP testing?" not yet finalized. (PRP-proof support will be in...
Forum: Software 2021-03-07, 21:50
Replies: 21
Views: 1,567
Posted By ewmayer
George, when doing e.g. PRP-testing and p-1 stage...

George, when doing e.g. PRP-testing and p-1 stage 1 we need to be able to include a small constant integer multiplier like 3 in the round-and-carry-step anyway, yes? Here some simple sample code from...
Forum: GPU Computing 2021-03-07, 20:30
Replies: 10
Views: 1,347
Posted By ewmayer
Oh, but reducing functionality after you buy...

Oh, but reducing functionality after you buy their product is exactly what various companies are already doing - for instance Apple is notorious for this...
Forum: Hardware 2021-03-05, 21:27
Replies: 168
Views: 22,175
Posted By ewmayer
Thanks, though as usual I needed reading glasses....

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...
Forum: Hardware 2021-03-05, 20:37
Replies: 15
Views: 1,558
Posted By ewmayer
I can only speak for the Radeon VII numbers, for...

I can only speak for the Radeon VII numbers, for which that page's ~300GHz-D/D are just over half the ~500GHz-D/D I get from each of my R7's, running underclocked (sclk=3) and pulling ~200W/GPU.
...
Forum: Hardware 2021-03-05, 20:15
Replies: 168
Views: 22,175
Posted By ewmayer
What worker/thread combination does its...

What worker/thread combination does its auto-tuner suggest is best in total-throughput terms?
Forum: Software 2021-03-01, 01:03
Replies: 21
Views: 1,567
Posted By ewmayer
I've seen similar "flailing" behavior using...

I've seen similar "flailing" behavior using gpuOwl, but always at or just beyond a max-expo-vs-FFT breakover point, e.g. forcing an expo ~107M to run at 5.5M FFT. But there computing per-iteration...
Forum: Software 2021-02-21, 21:39
Replies: 21
Views: 1,567
Posted By ewmayer
I just e-mailed George in hopes he can help you...

I just e-mailed George in hopes he can help you out. The ROEs seem high for those expos @5600K, but I've no time to look through the Prime95/mprime docs to figure out how to try to force a higher FFT...
Forum: Software 2021-02-21, 20:20
Replies: 21
Views: 1,567
Posted By ewmayer
What FFT length is it using for these 102-103M...

What FFT length is it using for these 102-103M expos? [For such ROEs to occur in the absence of data corruption, I would expect to see an FFT length intermediate between 5120K and 5632K.] Can you...
Forum: Mlucas 2021-02-19, 19:53
Replies: 19
Views: 1,625
Posted By ewmayer
Thanks - that is very helpful as far as future...

Thanks - that is very helpful as far as future roadmapping goes - so for selected of the FFT lengths:
o 26M: r0 = 208 needs to be made more accurate (rejected in your test.log due to excess ROE),...
Forum: Mlucas 2021-02-18, 21:08
Replies: 19
Views: 1,625
Posted By ewmayer
Some pics via Amazon.com here...

Some pics via Amazon.com here (https://www.amazon.com/Apple-Mini-Chip-256GB-Storage/dp/B08N5PHB83). The pic of the rear side shows an exhaust vent similar to those on my Intel NUCs - Lorenzo, are...
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