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-   -   P-1 factoring anyone? (https://www.mersenneforum.org/showthread.php?t=11101)

davieddy 2011-10-12 08:54

I came here for an argument
 
and am confronted vith zee legendary German SOH.


[QUOTE=ckdo;274214]Just to get this straight: The highest exponent I have assigned is 47,447,837. It's been LL tested before, but not P-1 tested (surprise, an on topic post).

So, if you're looking for someone who's holding up progress at whatever wavefront, look elsewhere.

If you're looking for someone to throw some smokin' silicon "at the coalface", also look elsewhere. I ain't interested.

And, lest we forget, you should consider the option of shelling out a few bucks and getting some work done yourself, rather than trying to evangelize those pursuing different goals.[/QUOTE]

For what its worth, I run my adequate Celeron 440 24/7, first time LLs,
P-1 when necessary, and ask the willing Eric to TF a few more bits on
his GPU.
I "spend" quite a bit of time monitoring the project's progress, and
if I think some aspect could be improved, I say so.

David Fawlty

LaurV 2011-10-12 09:36

[QUOTE=davieddy;274219]and am confronted vith zee legendary German SOH.[/QUOTE]

Acronym Definition
State Of Health
Start of Heading
Sydney Opera House (Sydney, Australia)
Save Our Homes (Amendment)
Section Overhead (SONET)
[B]Society of Homeopaths[/B]
Sense Of Humor (used in personal ads)
Sound of Hope (radio network)
Start Of Header
Safety and Occupational Health (USACE)
Stock On Hand
Soldiers of Honor (gaming)
Straits of Hormuz
[B]Sons of Hodir [/B](World of Warcraft)
Secretariat of Health
Snyder's of Hanover (bakery)
Siege of Hate (band)
Soldiers of Heaven
Survivors of Homicide
Secretary of Housing (US)
Stoughton Opera House (Stoughton, WI)
Signal Overhead (SONET)
[B]Scientific Observation Hole[/B]
Start of Overhaul
Second-Order-Hold
Saviors of Humor (gaming clan)
Significant Other Half
Space on Hire (India)
[B]Saints of Hell[/B]
Sine is Opposite divided by Hypotenuse (trigonometry)
So Over Him/Her
Sepia Officinalis Hemocyanin

(bold face is my own work)
(just to add some salt and pepper... flame war ahead!)

davieddy 2011-10-12 10:05

As I thought.
 
No[QUOTE=LaurV;274221]Sense Of Humor[/QUOTE]

Doncha just love these TLAs

David

davieddy 2011-10-12 10:44

@ckdo
 
There are ~50K people engaged in GIMPS.
One alone can't do much constructively.
OTOH One awkward c*** can put a f****** great spanner in the works.

Put that in your pipe and smoke it.

David

Christenson 2011-10-12 22:16

[QUOTE=petrw1;274194]Just a minor point of clarification. I was only reporting that I had 630 P-1 completions in 60 days. The project as a whole has done significantly more than that.[/QUOTE]

You mean I'm only doing 20% as much P-1 as YOU? :smile: Oh well...clean my clock again...but my numbers are similar, you probably have more cores doing it...

Davie:

As noted before, we are a only a few bits off the precise mathematical optimum...and ckdo isn't sitting on his TF assignments, he's farming them out to the likes of me and dubslow and chuck...and we are, at this point, finding factors more quickly than we could eliminate exponents by completing an LL test. But, given the equipment and algorithms available today, we will only eliminate 10-20% of exponents by TF, leaving the other 80% still needing LLs.

You ought to know that the global optimum for the project over even a single year's time may not be the same as the precise mathematical optimum accomplishment of proving Mersenne numbers not to be prime. The reason is because there is cross-coupling between the types of work done and how it is done and the total number of participants -- and with the distance from the mathematical optimum being relatively small, it is probably more important to increase the number of participants than it is to reach the precise optimum...

Case in point being the (I assume) large number of casual users that don't have enough patience to complete a full LL test....

Dubslow 2011-10-13 00:01

Are you kidding? I barely have the patience for them. The speed of TF is what keeps me alive! :smile:

petrw1 2011-10-13 03:21

[QUOTE=Christenson;274270]You mean I'm only doing 20% as much P-1 as YOU? :smile: Oh well...clean my clock again...but my numbers are similar, you probably have more cores doing it.[/QUOTE]

I set a goal of 10 P-1 per day a couple months ago and threw everything I could at it that is capable of doing large P-1.

Note with the quads it really only became feasible to assign 4 cores to P-1 use the MaxHigMemWorkers (2 or 3) and Memory= for each worker in Local.txt

Presently that consists of 23 cores:
(Not all run full time - you can guess by the thruput)
i5-750: 4 cores = 3.05 per day (OC'd to 3.2)
i7-860: 4 cores = 2.9 per day
Q9550: 4 cores = 1.65 per day
E8400: 2 cores = 1.2 per day
E6550: 2 cores = 0.4 per day
E8500: 2 cores = 0.4 per day
P4-3.4: 1 core = 0.45 per day
T6500: 1 core = 0.4 per day (I find 2 cores of a LapTop on P-1 overworks/overheats it)
i3-M330: 1 core = 0.15 per day (ditto)
========================
TOTAL: 10.6 per day

That only leaves me the following on TF:
T6500: 1 core
i3-M330: 1 core
P6000: 2 cores (owner complaining it was running too hard even with 1 core P-1)
P4-2.4: 1 core

Christenson 2011-10-13 03:35

I'm surprised you're not doing LLs or ECM on those extra cores...or do I need to sell you a GPU so you can find out why for yourself?

petrw1 2011-10-13 05:07

[QUOTE=Christenson;274304]I'm surprised you're not doing LLs or ECM on those extra cores...or do I need to sell you a GPU so you can find out why for yourself?[/QUOTE]

IMHO....
1. P-1 is where the most help is needed
2. On the P-1 list I can feel I am a top contributor. I tried allocating almost everything to LL for a good part of a year and couldn't crack top-100.
3. ECM does NOT contribute to finding Mersenne Primes (I'd like to help)
4. My next PC (when I am working again) will probably have a good GPU ... not necessarily for TF (there are lots there) but it appears LL on a GPU is becomming a reality.

Dubslow 2011-10-13 05:25

I think he meant the cores you currently use for TF

davieddy 2011-10-13 07:32

Apologies to all for any pottymouthing
 
Although I'm not averse to getting my hands dirty, be it
programming, running software or owning hardware,
I am a theorist at heart.

At the end my second year at Oxford (physics) a graduate had to
peruse my file with the details of the experiments I had done.
(We had the choice of continuing with "practical" or taking the theoretical option)
After five seconds he said "You are going to do the theory option aren't you?"

I would like to think this was because I (gratuitously) noted the
theory which justified the experiment, but it was probably my scrawly handwriting.

BTW there are two large threads in the Lounge discussing the effect
of GPUs on TF.

David


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