Sieving Riesel & Sierp base 16
 

Hey all,

I'm currently sieving Riesel and Sierp base 16 together for the remaining unreserved k's for n=200K-500K as a slightly lower priority effort. The optimum sieve depth for breaking off n=200K-300K is P=12T. This assumes the very likely possibility that we won't complete testing both drives to n=300K within ~1 year and so only takes into account the rate of factor removal from the n=200K-300K portion of the file; not the entire file.

I'm not going to make a formal sieving drive out of it but if anyone would like to help, please post a reservation here.

The file sieved to P=8T is attached to this posting. I'll remove factors from it as we progress. It takes one 64-bit 2.4 Ghz core ~5 days to sieve a P=1T range using 64-bit sr2sieve.

When we're at P=12T, I'll remove the n=200K-300K part of the file and post some files in the Riesel base 16 drive for testing. When/if we find some more primes on Sierp base 16 before reaching n=200K, I'll remove those k's from the file. We can also continue sieving n=300K-500K as a very low priority effort if anyone wants to.

These are good bases to run the much faster-testing power-of-2 bases. Iirc, even with the new PFGW, as a general rule, I've found that they test ~2.5-3 times faster than non-power-of-2 bases for the same size k-value and # of digits. (Yes, the smaller k-values can test much faster than the larger ones, even on non-power-of-2 bases using the new PFGW.)


Reservations:
[code]
gd_barnes P<=3T complete
Flatlander P=3T-4T complete
gd_barnes P=4T-5T complete
Flatlander P=5T-8T complete
gd_barnes P=8T-12T complete
(Sieving is paused as we break off and test n=200K-300K.)
[/code]Gary

Taking 3T-4T.

Where is the file?

I wasn't going to post it until I found out if there was any interest. I've now attached it to the 1st posting here. Thanks for helping. :smile:


Gary

P=2T-3T is done. Taking P=4T-5T.

Taking 5T-6T.

Taking 6T-7T.

3T-4T is complete.

P=4T-5T is complete. I'll reserve more later next week after getting back from a business trip.

5T-6T is complete.

6T-7T is complete.

Taking 7T-8T.

7T-8T is complete.
Due to hardware issues I've had to go back to 32bit Windows, so I won't be sieving for a while.

That's a bummer on having to go to 32 bit. Thanks for the help.

I'll go ahead and reserve P=8T-10T and put it on 2 cores. I'll see if I can get us up to P=12T by mid-month so that we can get the Riesel drive started again.


Gary

P=8T-10T is complete. Reserving P=10T-12T.

BTW, quite some time back, I posted the file sieved to P=8T in the first post here.

If anyone is interested in helping, we can go ahead and sieve this range to a few trillion above P=12T. That's optimal if it takes us at least a year to finish testing n=200K-300K on both sides. Since n=300K is n=1.2M base 2, it's quite a bit of work for 43 k's, although the avg. k is very low weight.

P=10T-12T is complete. The sieving effort is paused as we break off and test n=200K-300K.