Pre-combined sieving remaining.

[Brucifer]

This is a *really* expensive hobby! It's just unfortunate for my wallet that I get such a kick out of it. My recalcitrant A/C unit decided to puke it's guts yesterday afternoon and I had a "scram" session due to rapidly rising high temperatures.

Anyway I was fortunate that the gal at the A/C shop took pity on me and squeezed me in today so I could get my farm running again. So what went wrong? We don't really know for sure but are suspecting a leak. However after crawling along and checking the pressure line, we couldn't find anything. So more coolant was added, and we will find out for sure before long since the hot weather is right around the corner. The last time he was out here working on this the weather was totally terrible, so he isn't sure whether or not he actually put enough back into the system after some pressure switches were added to the system.

So anyway, I guess this ought to cheer Lars up some. At least I should be able to get the 3000 block finished. So I'm back in operations with a flat wallet. I keep wanting to buy a dual core, but it seems like somthing keeps cropping up that takes my sandbagged dual core funds.....

[Brucifer]

Well it looks like all the pre-combined blocks have been reserved, so now all we have to do is to finish the reserved blocks we have. So it's nice to see that we have reached a PSP goal!!!

[Brucifer]

What's the game plan now that thecombined sieving has been reached?

[NeoGen]

They reserved another large batch for combined sieving at they yahoo group, and took out the regular dat file, so I guess the future is in combined.

But since combined sieving is quite slower than regular was, if we pressed some more on the PRP'ing side to help find a prime it would be great to all sievers, as each prime found cuts down on the dat file and sieving gets much faster.

[Brucifer]

yeah, I'm averaging about a 25% slow-down on the combined stuff as compared to the psp-only.

Finding a prime cuts down on stuff, but there sure aren't many of them found. And cpu efficiency wise, doing llrnet on an AMD is rather slow, as really it is an Intel game.

[NeoGen]

I think that on more recent AMD's (AMD64's X2's, Opterons) that rule doesn't apply no more... :P

Can anyone here do a few performance tests to see if this theory holds?

[Brucifer]

yep, I did, my amd64's are losing 25% too. The combined sieving is deeper and broader than the psp-only sieving.

[NeoGen]

Oops... my question was misleading, sorry. :oops: I meant to ask if the LLR on newer AMD's was still significantly slower than on equivalent Intels.

[Brucifer]

I have only a few pre-combined ranges left that should clear this afternoon on AMD-64's. I will put one of those 64's on the psp llrnet and see how it compares. I know a while back I was doing some rieselsieve llrnet on a 64, and it didn't keep up with my Celeron D 2.8 533. I don't expect that will change on the psp llrnet either. It is just an Intel game unfortunately. Doesn't mean though that you can't use them on llrnet, it's just that they aren't being used most efficiently.

[Brucifer]

I'm running about 3ms per iteraton slower on a socket 939 AMD-64 3200 than the celeron D 2.8 x533. So there is a lot of other stuff I'd rather run the amd-64's on than llrnet.