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Search: Posts Made By: ewmayer
Forum: Hardware 2021-06-13, 23:57
Replies: 195
Views: 26,166
Posted By ewmayer
@Paul - thx. NUMA-ness must be enabled by default...

@Paul - thx. NUMA-ness must be enabled by default in BIOS, because after installing the package, 'numactl -H' gives
[ewmayer@localhost ~]$ numactl -H
available: 2 nodes (0-1)
node 0 cpus: 0 1 2 3...
Forum: Hardware 2021-06-13, 22:59
Replies: 195
Views: 26,166
Posted By ewmayer
I have 2 good reasons for not using numactl: ...

I have 2 good reasons for not using numactl:

1. I don't know which mode is currently being set for MCDRAM, with regular RAM now installed, and found no related boot option;

2. 'numactl: command...
Forum: Hardware 2021-06-13, 22:18
Replies: 195
Views: 26,166
Posted By ewmayer
Quote from the above-linked Colfax page: ...

Quote from the above-linked Colfax page:

Again, though, I've not found a way to control the configuration mode, the only visible NUMA-related subitems in the SuperMicro boot menu are disabled, and...
Forum: Hardware 2021-06-13, 21:56
Replies: 195
Views: 26,166
Posted By ewmayer
@kriesel: Thx, but the Cray docs refer to a...

@kriesel: Thx, but the Cray docs refer to a particular KNL-node hardware configuration which they apparently used in some KNL-based supercomputers.


I revisited this similar tutorial from Colfax...
Forum: Hardware 2021-06-13, 00:56
Replies: 195
Views: 26,166
Posted By ewmayer
192GB RAM successfully installed and running...

192GB RAM successfully installed and running @2400MHz per the BIOS. But -

1. Runtime for my ongoing LL-DC on cpu 64-67 jumped from 22 ms/iter to 37 ms/iter. The per-iter times for the big F30 DC...
Forum: Hardware 2021-06-11, 20:42
Replies: 195
Views: 26,166
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: 386
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: 59
Views: 2,942
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: 59
Views: 2,942
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: 8,501
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: 5,754
Posted By ewmayer
Good suggestion - done.

Good suggestion - done.
Forum: Hardware 2021-05-25, 22:40
Replies: 195
Views: 26,166
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: 5,754
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: 2,292
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: 2,701
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: 404
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: 404
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: 3,279
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: 3,279
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: 2,292
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: 2,701
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: 2,701
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: 195
Views: 26,166
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: 195
Views: 26,166
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: 3,833
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...
Showing results 1 to 25 of 1000

 
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