Sierp. base 6 team sieve

[mdettweiler]

Originally Posted by gd_barnes

Anon, I suppose if we are using the fastest siever, we should use the fastest LLRer to compute the optimum depth. Carlos's and Karsten's quad(s) are the fastest LLRing machines that I've seen.

Using Carlos's time will reduce optimum depth for breaking off n=100K-150K. It would now be:

1.3T * 614 / 129 ~= 6.2T.

So...round down to P=~5.5T-6T to allow for future factor removal additionally reducing the sieving removal rate.

This is still only a 'ball park' estimate. When we hit about P=4T and have all factors removed to that point, then I would consider the factor removal rate at that point close enough to extrapolate an optimum sieve depth.

Then, we'll get to do it all over again for n=150K-200K starting from P=~5.5T-6T.

If anyone has a faster sieving or LLRing machine -AND- you will be either helping with sieving or LLRing Sierp base 6 now or in the future, let me know. I want to get as close as possible to an apples-to-apples comparison.


Thanks,
Gary

Well, for an apples-to-apples comparison, probably a non-overclocked Core 2 (Duo or Quad) would be best--I think they're about equally good at sieving and LLR/PRPing. So, maybe this p-rate information from my Core 2 Duo 2.2Ghz would be helpful:

p=1796383025029, 1221822 p/sec, 153 factors, 92.8% done, 248 sec/factor
Expected factors in range 1750G-1800G: 159.22

My machine is not overclocked, and is running 32-bit Linux (so it's probably a pretty good apples-to-apples comparison of sieving and LLR).

[gd_barnes]

Originally Posted by Anonymous

Well, for an apples-to-apples comparison, probably a non-overclocked Core 2 (Duo or Quad) would be best--I think they're about equally good at sieving and LLR/PRPing. So, maybe this p-rate information from my Core 2 Duo 2.2Ghz would be helpful:

p=1796383025029, 1221822 p/sec, 153 factors, 92.8% done, 248 sec/factor
Expected factors in range 1750G-1800G: 159.22

My machine is not overclocked, and is running 32-bit Linux (so it's probably a pretty good apples-to-apples comparison of sieving and LLR).

Good point. I agree with this and is the way I do the optimum sieve depths on NPLB. We'll get the more exact depth a little later using this method instead.


Gary

[mdettweiler]

1750G-1800G complete.

[KriZp]

1200G-1500G KriZp complete
reserving 2500G-3000G KriZp

[gd_barnes]

Adding 2 more cores...

Reserving P=3T-3.25T

1.5T-1.75T should be done very early Thursday morning.

[grobie]

Reserving 3250 to 3400 ETA Apr 5th

[gd_barnes]

1500G-1750G complete; factors to be Emailed

Reserving 3400G-3500G...a small range to sync up the 4 machines for a large reservation next time.

[em99010pepe]

Reserving 3500-4100
and 4100-4700

ETA~less than 2 days.

[em99010pepe]

So how deep are we going? Just asking because a heat wave is passing Portugal and sieving reduces the CPU temps by 5 ºC. If this goes on I prefer to sieve without having the necessity to reduce the CPU speed. lol

BTW, 3500-4100 at 83%.

Carlos

[gd_barnes]

Reserving 4700G-5200G for my 4 machines. My 2 ranges will finish up this morning and afternoon; will send factors then.


Carlos, we still have to do a calculation but I'm guessing 6000G = 6T for breaking off n=100K-150K; closer to 9T-10T for n=150K-200K; then it goes up from there. We're sieving n=100K-400K so plenty of work to do.

As soon as Anon gets all contiguous factors up to P=~3000G-3500G, he can remove them and run a test at P=~5000G to see what his remove rate is and we can do the calculation.

Once we hit optimal for n=100K-150K, we'll stop, remove that n-range, add it to drive 3, and continue sieving n=150K-400K.


Gary

[em99010pepe]

3500-4100 done, factors sent.