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Hi Everyone
I am new to prime grid, i have just started to run the programme on my PC, I only want to crunch on my GPU, I have a old titan x, I think i am running a PPS work units on GPU. My questions is there any work units i can run that could discover a prime number on GPU? or is that mainly for CPU,
I think i remember reading that PPS help to discover prime numbers which i also really enjoy,
hope everyone is having a great day.
Martin
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 mikey
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Joined: 17 Mar 09
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Hi Everyone
I am new to prime grid, i have just started to run the programme on my PC, I only want to crunch on my GPU, I have a old titan x, I think i am running a PPS work units on GPU. My questions is there any work units i can run that could discover a prime number on GPU? or is that mainly for CPU,
I think i remember reading that PPS help to discover prime numbers which i also really enjoy,
hope everyone is having a great day.
Martin
YES you are crunching workunits on your gpu and YES you can find prime numbers on PPS Sieve, I've been crunching for a long time here and have found 1,398,942 "Primes/Factors" on just PPS Sieve. That doesn't count all the other sub projects I've also found "primes/factors" while crunching here at PrimeGrid.
Here is the website that shows that kind of stuff:
https://stats.free-dc.org/user/pgrid/37043
That is my numbers you will have to change the userid number to your own and refresh the page to see your own numbers. You are very new here so your stats may be blank at this point but should fill in over time. | |
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dthonon Volunteer tester
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Sieves do not find primes, but they eliminate composite numbers. In PrimeGrid search space, where numbers are huge, sieving is not pushed until all possible composite numbers are removed.
To find primes with a GPU, you need to run a Generalized Fermat Prime Search project. Start with GFN-15, you should find a prime fairly soon with a Titan-X. | |
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Ravi FernandoProject administrator
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Welcome to PrimeGrid! We have several projects suitable for GPUs: the GFN projects (GFN15-22 and Do You Feel Lucky?), AP27, and PPS Sieve. Of these, the GFN projects are searching for large primes (anywhere from ~250,000 digits for GFN15 to ~25,000,000 digits for DYFL), the AP27 project is searching for long arithmetic progressions of primes (involving 20-27 primes of about 18 digits each), and the PPS Sieve is looking for factors of Proth numbers. (The remaining Proth candidates will then be tested in the PPS LLR projects, which are for CPUs. So the PPS Sieve helps our prime-finding efforts, but it won't discover any big primes on its own.) If you want to discover a big prime on your GPU, the GFN projects are the way to go.
However, I notice in your list of tasks that your computer has returned a lot of workunits with errors. I'm pretty new here myself (and don't have a usable GPU anyway), so I'm not sure what the problem is. If I were you, I'd first check the fine print under each project on the preferences page (also linked in the top left corner of the page, item 4) to make sure your GPU is compatible with the various projects. If that doesn't help, then you might check the "Problems and Help" forum. People are very helpful there :)
Last comment, in case it isn't clear: all work here is useful, and you should run whatever you find most interesting. Happy crunching! | |
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Keith
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Welcome!
You do have a really good computer there.
However, the AP and GFN tasks are failing on your computer. The common cause of this, when paired with Windows 10, is that Windows installed a video driver that is not suitable for this kind of work. So you will need to go to the nvidia website and download the newest official drivers for your video card and install them. Then you should be able to find primes on the GPU with the GFN projects.
On the forums there are sections for each type of task you can run here. Take a look at the sticky threads in those to see what kinds of primes each kind of project is looking for.
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Badge Score: 2*1 + 4*2 + 5*1 + 6*12 + 9*2 + 10*1 = 115
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Welcome to PG, MartinBData !
Ravi Fernando wrote: ...
However, I notice in your list of tasks that your computer has returned a lot of workunits with errors.
...
Well noted, Ravi.
Hope someonelse can help with the errors 'cause I dont' have a clue.
Edit:
Martin, your CPU is very capable of finding a prime.
If I were you I'd give it a try.
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Something that does not occur in a year may, perchance, happen in a moment. | |
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Michael GoetzVolunteer moderator
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Hi Everyone
I am new to prime grid, i have just started to run the programme on my PC, I only want to crunch on my GPU, I have a old titan x, I think i am running a PPS work units on GPU. My questions is there any work units i can run that could discover a prime number on GPU? or is that mainly for CPU,
I think i remember reading that PPS help to discover prime numbers which i also really enjoy,
hope everyone is having a great day.
Martin
Welcome to PrimeGrid, Martin.
Most of the advice you've received is good advice, except for one thing: You can not find primes with a sieve. In fact, sieves do the exact opposite: they find not-primes (i.e., composite numbers). So if you want to find prime numbers, a sieve task is the wrong thing to be running.
However, there's plenty of GPU apps that DO find primes, specifically all of the GFN applications. I suggest running GFN-15 since it's the smallest of the GFN applications and is most likely to find a prime quickly.
Your CPU is not a bad or slow one, so there's certainly no need for you to avoid CPU tasks should you want to go in that direction. The fastest (i.e., smallest) tasks for CPUs are PPSE and SGS.
Good luck!
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YES you are crunching workunits on your gpu and YES you can find prime numbers on PPS Sieve, I've been crunching for a long time here and have found 1,398,942 "Primes/Factors" on just PPS Sieve. That doesn't count all the other sub projects I've also found "primes/factors" while crunching here at PrimeGrid.
This is misleading. If I sieve a bunch of numbers with hundreds of thousand of digits, and it turns out one of these huge numbers is divisible by 29, have I "found" a prime? No. I have eliminated a huge number and saved others from having to test that huge number.
You may claim that I found the prime 29. But we were not interested in small primes, we were interested in huge primes. Sieves do not "find" small primes (these primes are too small to be "findable"), they remove huge non-primes.
Sieves basically run through a bunch of small primes (see, the sieve "knows" the prime even if it does not divide any of the considered huge candidates) that are uninteresting to see if they can eliminate an interesting candidate.
/JeppeSN | |
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Hi dthonon
I did not know that sieves eliminate composite numbers good to know, I will change the settings so that I receive GFN-15 work units on GPU. it good to know that my graphics card still has a chance of finding a prime. thank you for the advice. :-)
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Hi Ravi
Thank you its good to be here, I think I will change my settings to receive GFN-15-22, I sure do feel luckily lol. hope to find one in 4 months if not it is still a lot of fun anyway. I did not know that the numbers get that large I knew they where big but I did not know that they could get up to 25 million digits long. thank you for the information its good when someone explains it as it can be quite overwhelming when you first start. I also want to help out even though it will not find primes but helps to find prime numbers.
I think I solved the problem with PC rejecting work units but I will update my graphics card drivers before I change to the GFN-15 work units just in case. thank you for the advice, hope your having a good day. :-)
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Hi Keith
Thank you its good to be here hope your having a good day, its good to know that my PC is good and will be able to handle the work units. I will update my graphics card drivers and hopefully that fixes the problem, I will have a look at the threads to see if anyone else has similar problems thank you for the advice.
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Hi Eudy, I will give it a go at my CPU finding a prime. | |
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mikey
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YES you are crunching workunits on your gpu and YES you can find prime numbers on PPS Sieve, I've been crunching for a long time here and have found 1,398,942 "Primes/Factors" on just PPS Sieve. That doesn't count all the other sub projects I've also found "primes/factors" while crunching here at PrimeGrid.
This is misleading. If I sieve a bunch of numbers with hundreds of thousand of digits, and it turns out one of these huge numbers is divisible by 29, have I "found" a prime? No. I have eliminated a huge number and saved others from having to test that huge number.
You may claim that I found the prime 29. But we were not interested in small primes, we were interested in huge primes. Sieves do not "find" small primes (these primes are too small to be "findable"), they remove huge non-primes.
Sieves basically run through a bunch of small primes (see, the sieve "knows" the prime even if it does not divide any of the considered huge candidates) that are uninteresting to see if they can eliminate an interesting candidate.
/JeppeSN
I see that now, it seems I have misunderstood what the column "primes/factors" means. | |
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VatoVolunteer tester
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"primes/factors" columns could easily have been labelled "found things".
it's a count of however many things you've found that the subproject is searching for.
Sieves find factors, which removed composite candidates from the list.
LLR & GFN find primes.
AP27 finds sequences of (smaller) primes.
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Michael GoetzVolunteer moderator
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"primes/factors" columns could easily have been labelled "found things".
it's a count of however many things you've found that the subproject is searching for.
Sieves find factors, which removed composite candidates from the list.
LLR & GFN find primes.
AP27 finds sequences of (smaller) primes.
Where do you see "primes/factors"???
The private user account page says "factors found".
Nowhere in our server code does the string "primes/factors" appear.
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Ravi FernandoProject administrator
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Free-DC (e.g. mikey's link) uses the term "Primes/Factors". | |
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Michael GoetzVolunteer moderator
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Free-DC (e.g. mikey's link) uses the term "Primes/Factors".
I guess he's lumping all of it together -- on any given sub-project, you're either finding "primes" or "factors" (and AP26 is in a class by itself). They're not the same thing, obviously.
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VatoVolunteer tester
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Yes, sorry - i was just responding to the question, and had Free-DC in mind.
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