Next Available Range

[Nasdaq]

Have liased with Joe O and agreed that jumping to 100P is not a problem.

You guys are nuts - there's no point in sieving at that high level, and you'll break even at best. This is getting extremely close to the point where the average time it takes to find a factor is longer than the time to finish a PRP test.

Unlike GIMPS, we're not trying to find all the primes in the range being sieved. A prime for one of the six k's at 17M, for example, means that all the factors for that k above 17M are now useless, since that k is eliminated. When you take this into account, the optimal sieve depth will be lower: around 50-75P.

[opyrt]

You guys are nuts - there's no point in sieving at that high level, and you'll break even at best. This is getting extremely close to the point where the average time it takes to find a factor is longer than the time to finish a PRP test.

From what I see on my testrange above 100P this seems correct. Having 8 cores running for 3 days without a result feels demoralizing.

Matt: Any chance we could get a lower range back from PrimeGrid? In that way we could actually contribute. ;-)

[runesk]

From what I see on my testrange above 100P this seems correct. Having 8 cores running for 3 days without a result feels demoralizing.

Matt: Any chance we could get a lower range back from PrimeGrid? In that way we could actually contribute. ;-)

I've done my last manual sieve range above 100P. Crunching all weekend without a hint of a factor gives me no joy.

My thoughts is that if you want to continue supporting manual sieveing, you should get back some of the range received by PrimeGrid. The other solution is to only support PrimeGrid... (and then you should be removed from DC-Vault as well). I might join PrimeGrid, but at the moment, my focus is non-boinc, and I get some strange satisfaction doing just that (some might consider this some kind of insanity, I'm sure)...

.R

[Matt]

I've messaged Joe O to let him know your concerns.

[Joe O]

I've messaged Joe O to let him know your concerns.

Available: 70000000 -> 80000000

[opyrt]

Thank you guys!

Seems much better.

[wolfemancs]

In the last year (according to the comments on http://www.sierpinskisieve.com/complete.php?all=1 PrimeGrid has gone from 31,587,913 on March 15, 2009, to very near 70,000,000 with the challenge that concluded today.

The manual effort was given back 70-80P on March 31 last year and is currently at 70.96P (last reserved). Would it make sense to give some of this range back to PrimeGrid? Maybe leave the manual sieve another years worth of work and return 72-80 to PrimeGrid?

At the current pace PrimeGrid will be working on the 100P range that you guys didn't think was very profitable before the manual effort even breaks 71.5P leaving 8.5P of "useful" work unsieved while PrimeGrid is doing less useful work.

Even at 65-70P, and even with a 64 bit AMD machine (much better siever than LLR machine), if I decide that all I care about is SoB, and not PSP, it's becoming very close to a push as to whether it's more efficient to sieve or LLR. If PrimeGrid has to bump to 80P it tips even more toward LLR tests.

In the interests of full disclosure, I'm a PrimeGrid siever, not a manual siever, so feel free to ignore me. :-)