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Forum: Analysis & Analytic Number Theory 2021-02-06, 20:55
Replies: 2
Views: 7,981
Posted By bgbeuning
Learning about NP-complete problems was a while a...

Learning about NP-complete problems was a while a go,
but "which factorization is closest to sqrt(N)" sounds like
the "0-1 knapsack" problem.
Forum: Analysis & Analytic Number Theory 2021-02-06, 16:44
Replies: 2
Views: 7,981
Posted By bgbeuning
Fermat method best case

I am a computer guy and not a math guy.
I have been playing with Fermat's factoring method and come upon a math question.
In the worst case Fermat is O(n^1/2) but in the best case it is O(1).
I am...
Forum: Other Mathematical Topics 2021-01-29, 21:17
Replies: 52
Views: 22,944
Posted By bgbeuning
This thread is old, but I did not see any...

This thread is old, but I did not see any reference to quadratic residues to speed up Fermat's method.
See Knuth, Vol 2, Section 4.5.4, Algorithm D.
Forum: Hardware 2019-01-20, 13:41
Replies: 5
Views: 1,019
Posted By bgbeuning
Lightning

Last summer lighting hit a tree in my backyard.
The surge took out various items in the house.
(Utilities run near the street and enter the far side of the house.)

But for GIMPS purposes, it...
Forum: Soap Box 2019-01-17, 11:23
Replies: 93
Views: 8,518
Posted By bgbeuning
The vast majority of scientific papers support...

The vast majority of scientific papers support that man is causing global warming.
These papers go through a rigorous peer review process to catch mistakes.

I trust scientists to deal in facts...
Forum: Lounge 2018-07-20, 03:15
Replies: 27
Views: 4,368
Posted By bgbeuning
Most high schools have guidance counselors who...

Most high schools have guidance counselors who can offer tests to see what
you might like to get into.

I think a lot of college students are in your position.
One plan is to take a wide variety...
Forum: Soap Box 2018-02-24, 20:00
Replies: 714
Views: 70,450
Posted By bgbeuning
I strongly support the 2nd amendment. Everyone...

I strongly support the 2nd amendment.
Everyone should be able to bear the same arms as George Washington.

Most of the original 10 amendments say we can not do things the
British tried to do to...
Forum: Software 2018-01-28, 14:40
Replies: 8
Views: 2,542
Posted By bgbeuning
prime95 config file changes

Sometimes I want to make a config file change and hope prime95 will
see the change at some point. But sometimes it seems to just overwrite
my change and lose it.

Prime95 has config files...
Forum: Soap Box 2018-01-28, 14:35
Replies: 35
Views: 5,283
Posted By bgbeuning
I took the "no admissions" picture to mean ...

I took the "no admissions" picture to mean
"This is a tourist area, no locals allowed"

but maybe that is just cynical me.
Forum: Soap Box 2018-01-23, 01:13
Replies: 182
Views: 36,676
Posted By bgbeuning
Bill Gates has a company terrapower...

Bill Gates has a company terrapower (http://terrapower.com/) that
uses a fuel that was a byproduct of nuclear refining that is sitting in stockpiles in TN / KY.
There first customer is in China....
Forum: GPU Computing 2018-01-14, 00:24
Replies: 375
Views: 55,248
Posted By bgbeuning
This seems to assume one GPU PCI card per...

This seems to assume one GPU PCI card per machine.
I have machines with 4 GPU each.
The other nvidia programs have a -d argument (device) to say which GPU to run on.
Forum: Lounge 2018-01-13, 02:39
Replies: 67
Views: 14,836
Posted By bgbeuning
My guess is p=80,322,241 on Jan 10, 2019 My...

My guess is p=80,322,241 on Jan 10, 2019

My reasoning is the last two primes had a ratio of 1.040 and
even though that is a historically low ratio, I am an optimist.
Forum: Hardware 2018-01-13, 02:24
Replies: 11
Views: 1,676
Posted By bgbeuning
One NUMA node accessing memory on another NUMA...

One NUMA node accessing memory on another NUMA node is something like 50% to 100% slower than a node accessing its local memory.
Most OS will try to allocate memory on the numa node with the core...
Forum: Information & Answers 2018-01-12, 02:57
Replies: 20
Views: 4,795
Posted By bgbeuning
Here are all the work types from the prime95...

Here are all the work types from the prime95 source code.

Most people use work type 0. It checks how fast your machine is
and picks the best work for it. A newer machine will get some double...
Forum: Hardware 2018-01-10, 16:32
Replies: 19
Views: 3,978
Posted By bgbeuning
Most chip sets on most motherboards support 2...

Most chip sets on most motherboards support 2 memory channels.
The LGA 2066 on your motherboard support 4 memory channels.
That should mean it can handle twice as many cores before memory
is the...
Forum: Lounge 2018-01-09, 23:13
Replies: 24
Views: 3,520
Posted By bgbeuning
Why climb Mt. Everest? Because it is there!

Why climb Mt. Everest?
Because it is there!
Forum: News 2018-01-01, 12:55
Replies: 505
Views: 115,600
Posted By bgbeuning
At one time finding primes had cash rewards. ...

At one time finding primes had cash rewards.
The GIMPS project had a long debate on how to split the reward.
I think part of the reason for the disclosure rules is to make sure
someone does not...
Forum: News 2017-12-30, 22:50
Replies: 505
Views: 115,600
Posted By bgbeuning
Congrats everyone! Thanks to everyone on that...

Congrats everyone!
Thanks to everyone on that 1023 long e-mail list who coordinate our efforts.
Forum: Information & Answers 2017-12-16, 23:17
Replies: 18
Views: 1,694
Posted By bgbeuning
I was not involved so this is just a guess. ...

I was not involved so this is just a guess.

A CPU has an FPU (Floating Point Unit) per core.
A GPU might have 40 to 100 FPU, so it can do a lot more computing, so a GPU gets more credit.

We...
Forum: GPU Computing 2017-12-13, 01:47
Replies: 16
Views: 3,853
Posted By bgbeuning
I never run mkaftc as root and it works fine. ...

I never run mkaftc as root and it works fine.
When mfaktc removes a task in worktodo.txt,
it creates a new file to replace it. The new file
is owned by the user running the process, or root.
Forum: GPU Computing 2017-12-11, 01:05
Replies: 16
Views: 3,853
Posted By bgbeuning
I run misfit on one machine, and mfaktc on other...

I run misfit on one machine, and mfaktc on other machines,
and misfit assigns them all work.
Makes sure the samba shares are writable
/etc/samba/smb.conf
read only = no
Forum: Linux 2017-10-11, 02:24
Replies: 29
Views: 10,378
Posted By bgbeuning
bc seems to be doing base 10 arithmetic. gmp...

bc seems to be doing base 10 arithmetic.
gmp and most "advanced" packages do base 2^32 (or close) arithmetic.
Forum: Linux 2017-10-10, 00:48
Replies: 29
Views: 10,378
Posted By bgbeuning
GNU bc has an extension to allow passing arrays...

GNU bc has an extension to allow passing arrays using "call by variable".
It looks like
zero( *a[], n ) {
for( i = 0; i < n; i++ ) a[i] = 0;
}

This is from reading the YACC grammar. ...
Forum: Software 2017-09-11, 18:11
Replies: 18
Views: 3,537
Posted By bgbeuning
On Windows, when a thread allocates memory the OS...

On Windows, when a thread allocates memory the OS fills the allocation
from the same NUMA node as the CPU the thread is running on.
If thread affinity is used to bind a thread to a CPU, then things...
Forum: Hardware 2017-08-31, 02:59
Replies: 42
Views: 4,855
Posted By bgbeuning
1.2e6 total GHz days

I am currently number 6 on the "top producers page".

I have 18 machines (most 4 core but one 24 core) running prime95
and 8 GPU (various models from Nvidia 760 to 980) running mfaktc.

During...
Showing results 1 to 25 of 255

 
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