even ks and the Riesel Conjecture

[jasong]

I have 4 2.4GHz cores that will slowly become free over the next 2-5 days.

If any sieving needs to be done, I have a question and a request:

Is it srsieve that's the best to one use for multiple ks with a base more than 2? The second question is, are there any particular files people would like help sieving with? A core2quad sieves pretty well, and I'd be happy to run whatever helps the project the most.

Edit: Never mind, I just noticed the new forum.

[gd_barnes]

Originally Posted by jasong

I have 4 2.4GHz cores that will slowly become free over the next 2-5 days.

If any sieving needs to be done, I have a question and a request:

Is it srsieve that's the best to one use for multiple ks with a base more than 2? The second question is, are there any particular files people would like help sieving with? A core2quad sieves pretty well, and I'd be happy to run whatever helps the project the most.

Edit: Never mind, I just noticed the new forum.

A little related info...

I am sieving the remaining two k's for Karsten (kar_bon) for this effort up to P=1T and will be done on Thurs. This still isn't enough sieving and I told him I'd have 2-6 cores available to throw at it after Sunday. For LLRing to n=1M, we probably need to sieve to at least P=4T on k=351134 (175567).

Reference best sieving software:
For 1 or 2 k's, use 1 or 2 instances of sr1sieve. (sr1sieve is over twice as fast as anything else for a single k)
For 3 to ~50-100 k's, use sr2sieve.
For ~50-100 k's or more, use srsieve.

For a small # of k's, srsieve is about the slowest software that you can use. Use sr1sieve or sr2sieve instead. (You'll have to get it started with srsieve and then switch over.) I'm getting P=6M and P=9M/second using sr1sieve on the files that you left posted here and that's on a Dell core duo, which is my fastest siever. You'd probably get faster on your quad.

I think the same applies to all bases.

As for helping sieve, you could help with team drive #1 in Conjectures 'R Us running sr2sieve beginning on Saturday. I have a couple of large factor gaps that I need to fill going up to P=1T but I'll have them filled by Saturday. We need to go to about P=1.5T, which I'm thinking will take about 10-12 CPU days on a core 2 duo; perhaps less on your quad.

If you're interested in sieving a portion of P=1T-1.5T (perhaps P=1T-1.2T) on the drive, let me know. We're sieving the range of n=100K-200K base 16 so they're all top-5000 candidates.

Thanks for the offer.


Gary

[jasong]

Originally Posted by gd_barnes

A little related info...

I am sieving the remaining two k's for Karsten (kar_bon) for this effort up to P=1T and will be done on Thurs. This still isn't enough sieving and I told him I'd have 2-6 cores available to throw at it after Sunday. For LLRing to n=1M, we probably need to sieve to at least P=4T on k=351134 (175567).

Reference best sieving software:
For 1 or 2 k's, use 1 or 2 instances of sr1sieve. (sr1sieve is over twice as fast as anything else for a single k)
For 3 to ~50-100 k's, use sr2sieve.
For ~50-100 k's or more, use srsieve.

For a small # of k's, srsieve is about the slowest software that you can use. Use sr1sieve or sr2sieve instead. (You'll have to get it started with srsieve and then switch over.) I'm getting P=6M and P=9M/second using sr1sieve on the files that you left posted here and that's on a Dell core duo, which is my fastest siever. You'd probably get faster on your quad.

I think the same applies to all bases.

As for helping sieve, you could help with team drive #1 in Conjectures 'R Us running sr2sieve beginning on Saturday. I have a couple of large factor gaps that I need to fill going up to P=1T but I'll have them filled by Saturday. We need to go to about P=1.5T, which I'm thinking will take about 10-12 CPU days on a core 2 duo; perhaps less on your quad.

If you're interested in sieving a portion of P=1T-1.5T (perhaps P=1T-1.2T) on the drive, let me know. We're sieving the range of n=100K-200K base 16 so they're all top-5000 candidates.

Thanks for the offer.


Gary

I have a couple days of sieving to do for a friend, and then ~850G for Riesel Sieve, then everything will be freed up for your(our?) project.

Looking forward to it. :)

[gd_barnes]

Originally Posted by kar_bon

i tested 239107 from jasong last n (564k) upto 873k now with no prime yet.

175567 tested from 525k to 655k, no prime.

i'll send you the remaining test-files for further sieving!

Karsten,

I have sieved k=351134 to P=5T and k=478214 to P=2.5T for the Riesel base 2 conjectures for even k's. This should be sufficient for LLRing well past n=1M now on both because k=478214 is so much lower weight. I'll do some calculations later on and let you know about how far to LLR them before sieving should be needed again.

The files are in their normal links on the Riesel conjectures reservation page.

Sieving removed 10-15% of the candidates in both files. You should get a significant time savings now.


Gary

[kar_bon]

that's great. i'll continue llr-test by now.

perhaps the 2 missing primes to prove this conjecture are just around the corner!

[kar_bon]

k=175567 at n=691k

k=239107 at n=918k

no new prime yet

[kar_bon]

Riesel base 2 even:
14361, 19401 and 20049 at n=379k

Riesel base 2 odd:
all 12k's at n=301k (includes doublechecking of Jean's k's)