Hello Chris,

There is something funky with the gpu72 website with regards to getting DCTF assignments. I'm setting options to "Let GPU72 decide" and it states it will factor to 70 bits (which is where I understand the immediate need is). The preview states that it will factor from 69 to 70 bits. However when I get the assignments, I get ones to factor from 70 to 71 bits. I'll finish the ones I've obtained, but I keep an eye for a fix to this before I request more.

-- Rich

[QUOTE=monst;387931]Hello Chris,

There is something funky with the gpu72 website with regards to getting DCTF assignments. I'm setting options to "Let GPU72 decide" and it states it will factor to 70 bits (which is where I understand the immediate need is). The preview states that it will factor from 69 to 70 bits. However when I get the assignments, I get ones to factor from 70 to 71 bits. I'll finish the ones I've obtained, but I keep an eye for a fix to this before I request more.

-- Rich[/QUOTE]

It looks like we're going to have enough power working on DCTF that we can factor all the way to 71 bits. If you really want to factor to just 70 bits, set it to 70 bits and pick "lowest exponent". Everything for Cat 1-3 DCTF is already fully factored, so what's left is all the same to GPU72.

[QUOTE=Mark Rose;387942]It looks like we're going to have enough power working on DCTF that we can factor all the way to 71 bits. If you really want to factor to just 70 bits, set it to 70 bits and pick "lowest exponent". Everything for Cat 1-3 DCTF is already fully factored, so what's left is all the same to GPU72.[/QUOTE]

Does this mean that I should upgrade my current assignments to 71? It is easy enough to do: dump unstarted assignments and grab a new bunch.

I usually go with mostly 2-3 days of queue, so if you are in the same case, better let it finish the 70s.
(actually it doesn't really matter, all of them would need to be done eventually...:smile:)

[QUOTE=LaurV;387945]I usually go with mostly 2-3 days of queue, so if you are in the same case, better let it finish the 70s.[/QUOTE]

I'm good with that. I've got a little less than 2 days queued.

It's not necessarily bad to have a lead of exponents sitting at 70 though, just in case some need to be released (at 70 vs lower).

I did a rough estimate of how much DCTF throughput we should be getting in a day or two based on who's already doing DCTF plus those who've said they will.

Result? Approximately 7 THz-d/d!

We have approximately 147 THz-days of work available or assigned at GPU72, with an approximately average of 7.5 GHz-d per assignment. That works out to about 933 exponents to 71 per day. At 7 THz-d/d we'll chew through all the available and assigned work in approximately 3 weeks. We'll be short about 50 exponents a day for this work (1000 total).

We'll still need another 35,000 exponents by mid January when the effort ends. Should we pull in two more ranges now? Since 38M, 40M, and 41M are mostly at 69 bits, they'll need about 8.9 GHz-d each. That will drop our throughput to about 800 exponents a day. We'll be short about 150 exponents a day for this work (short 5700).

We're short almost exactly the buffer of 6700 assignments, so if anyone else would like to jump on board to give us some margin, please do!

:chalsall:

An even balance of bit-first vs exponent-first is probably a good thing. Too many going from 69 to 71 means more exponents being released at 69. Too many going from 69 to 70 means too many released at 70. The latter is a bit unfortunate if we have the firepower to hit 71.

There's no sense getting tens of thousands of exponents to 70 without going to 71. That's a big buffer we don't really need.

[QUOTE=Mark Rose;387951]
We're short almost exactly the buffer of 6700 assignments, so if anyone else would like to jump on board to give us some margin, please do![/QUOTE]I don't have much but I'll throw a GTX650 (~70GHz-Days/D) at some to 70.

[QUOTE=legendarymudkip;387961]I don't have much but I'll throw a GTX650 (~70GHz-Days/D) at some to 70.[/QUOTE]

Thanks for all the cycles everyone; looks like we'll be able to squeak by without releasing anything at less than 71.

I've also brought a EC2 instance online for a while; 2 * 2050 Titans at ~520 GHz-d/d (aggregate) for ~13.5 cents an hour! :smile:

[QUOTE=legendarymudkip;387961]I don't have much but I'll throw a GTX650 (~70GHz-Days/D) at some to 70.[/QUOTE]

Every bit helps! I'm currently running 4 cards weaker than that one, 2 x GT 520 (29 GHz-d/d), and 2 x GT 430 (50 GHz-d/d). It adds up!