sr1sieve
 

The sr1sieve for AMD is about 100k faster than the sr1sieve for Intel but nepgen is still faster(over 2000k per sec.)
Which Intel processor is the best for primality proving and sieving?
Probably I will buy one in a few years. Now I'm still using my 3.2 GHZ Intel P4:smile: .

nuggetprime

[QUOTE]Which Intel processor is the best for primality proving and sieving?[/QUOTE]

Core2 duo/quad

Do you know something to make testing faster, or is 6 months time the best what I can get for n=300k-500k?

I am wondering the same. Sieved up to 300Billion from 200k-500k and there are a bit over 30k candidates left :/

Guys, you are using the best number-crunching software in the world. Sieving and then LLR is the best approach. Tricks like running sieves on AMD and LLR on P4 are all I can suggest. WRT core2d/q: wait a few months and they will be very cheap because AMD is going to release its new chip... :wink:

Well, yeah, but still :P

Anyway, school holiday wioll start from tomorrow, and last for a week. I talked to my computer class teacher, and she allowed me to use LLR on as many computers as I want(They have ~25 Pentium 4's with 2.4Ghz of raw power:flex: ) So I hope to find some primes in a few days :)

[QUOTE=paulunderwood;100890]Core2 duo/quad[/QUOTE]IMO: For C2Q you should not exceed FFT size of 112-128kB - above that you will get a large performance hit per core.

Oops, wrong thread.

kuratkull-- it's hard to oversieve in general. Spending one CPU week sieving when LLR on the range will take six months is not too long. On P4-2.4, LLR at 400k is around 6 minutes (depends on k value). When your sieve removes a candidate every 6 minutes, the sieve is deep enough. Note that from 200k to 500k, the average candidate is closer to 400k than the actual midpoint, because time to LLR does not increase linearly (it goes up as n^2, so 500k is about 6x longer than 200k per test). You can likely sieve to 1T or so using sr1sieve before splitting the file onto so many machines for LLR work.
Also, note with even a dozen computers, 6 CPU months of work will take 15 days per machine. When you choose your next k-value, set up the sieve to run to 600k or 700k (or 1M!), so you don't have to distribute and collect the files after just 2 weeks. But that's in the future.. for now, enjoy the results your labor of installing LLR on school computers provides!
-Curtis

Since you have only one week it's the best to go with pre-sieved candidates. For example our 5th Drive. I also have 8 Ks we got from Masser in the 700k-1M range, if you are interested let me know.

But before starting mass production please test LLR on a single machine using known primes to confirm that everything is all right.

Thanks for your comments :)

Yes, I have done testing before, and everything works, primes are found and such.

I don't have ONLY one week, I just asked my teacher if she would allow me, and she said that holiday is coming, and that would be a good opportunity, and since I get along with her pretty well, I don't think that continuing the LLR'ing after the holiday will be a problem.
I only got to sieve until 270Bil :/ (I didn't have enough time, because I started to sieve a few days ago, but talked to her about using the school computers just yesterday).

But now I'm on holiday and my school computers are doing some hard work :flex:

Hoping to find my FIRST prime soon :)