20091110, 04:56  #1 
May 2007
Kansas; USA
5^{2}·11·37 Posts 
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=200K500K as a slightly lower priority effort. The optimum sieve depth for breaking off n=200K300K 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=200K300K 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 64bit 2.4 Ghz core ~5 days to sieve a P=1T range using 64bit sr2sieve. When we're at P=12T, I'll remove the n=200K300K 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=300K500K as a very low priority effort if anyone wants to. These are good bases to run the much fastertesting powerof2 bases. Iirc, even with the new PFGW, as a general rule, I've found that they test ~2.53 times faster than nonpowerof2 bases for the same size kvalue and # of digits. (Yes, the smaller kvalues can test much faster than the larger ones, even on nonpowerof2 bases using the new PFGW.) Reservations: Code:
gd_barnes P<=3T complete Flatlander P=3T4T complete gd_barnes P=4T5T complete Flatlander P=5T8T complete gd_barnes P=8T12T complete (Sieving is paused as we break off and test n=200K300K.) Last fiddled with by gd_barnes on 20091214 at 09:24 Reason: update status 
20091111, 23:05  #2 
I quite division it
"Chris"
Feb 2005
England
31·67 Posts 
Taking 3T4T.
Where is the file? 
20091112, 06:14  #3 
May 2007
Kansas; USA
5^{2}×11×37 Posts 
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.
Gary 
20091113, 22:19  #4 
May 2007
Kansas; USA
5^{2}×11×37 Posts 
P=2T3T is done. Taking P=4T5T.

20091115, 19:48  #5 
I quite division it
"Chris"
Feb 2005
England
4035_{8} Posts 
Taking 5T6T.

20091117, 23:59  #6 
I quite division it
"Chris"
Feb 2005
England
31·67 Posts 
Taking 6T7T.

20091118, 14:45  #7 
I quite division it
"Chris"
Feb 2005
England
31·67 Posts 
3T4T is complete.

20091121, 21:51  #8 
May 2007
Kansas; USA
23677_{8} Posts 
P=4T5T is complete. I'll reserve more later next week after getting back from a business trip.

20091121, 22:26  #9 
I quite division it
"Chris"
Feb 2005
England
31·67 Posts 
5T6T is complete.

20091123, 23:21  #10 
I quite division it
"Chris"
Feb 2005
England
31×67 Posts 
6T7T is complete.
Taking 7T8T. 
20091202, 00:28  #11 
I quite division it
"Chris"
Feb 2005
England
31×67 Posts 
7T8T is complete.
Due to hardware issues I've had to go back to 32bit Windows, so I won't be sieving for a while. 
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