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 Showing results 1 to 25 of 255 Search took 0.04 seconds. Search: Posts Made By: bgbeuning
 2021-02-06, 20:55 Replies: 2 Views: 19,071 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.
 2021-02-06, 16:44 Replies: 2 Views: 19,071 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...
 2021-01-29, 21:17 Replies: 52 Views: 28,936 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: 1,225 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: 141 Views: 17,542 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: 4,935 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: 990 Views: 107,040 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: 3,007 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: 6,010 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: 224 Views: 46,327 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: 381 Views: 67,588 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: 16,983 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: 2,033 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: 5,607 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: 4,533 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: 4,092 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: 130,374 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: 130,374 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: 1,992 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: 4,257 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: 4,257 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: 12,782 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: 12,782 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: 4,171 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: 5,659 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...
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