1)
Message boards :
Cullen/Woodall prime search :
Cullen Woodall Sieve Resumed
(Message 162075)
Posted 28 days ago by rogue
If this is using my code, then I can provide an Intel Mac build, but I don't know if this is tightly integrated into BOINC. In other words I don't know if it has to built using BOINC headers and libraries. I can also provide an M1 Mac build using OpenCL, although I haven't tested it. I haven't finished the changes to support Metal as it has not been a priority.
IIRC the previous sieving work was done with ppsievecl, which might be faster.
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2)
Message boards :
General discussion :
FTX, crypto and investing
(Message 158887)
Posted 156 days ago by rogue
Fiat - Latin - let it be done.
Fiat - English - Fix it again Tony.
Sorry, I couldn't resist.
Crypto is closer to a Ponzi scheme than anything else. Those who invested early are making a lot of money. Those investing later are losing a lot of money. Crypto is tied to money laundering and various criminal activities. I'm waiting for world governments to ban it, but I suppose that too many people in power have crypto and don't want to lose their investment. China has banned it. Just waiting on the US to do it. That would likely completely kill all crypto.
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3)
Message boards :
Sieving :
Automated sieving
(Message 158364)
Posted 174 days ago by rogue
I'm looking into a change for mfsieve/mfsievecl to speed up sieving. It won't double the speed for 1e6 < n < 2e6, but it should be more than 50% faster. It is a matter of computing 1e6! mod p faster than what it does today.
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4)
Message boards :
Sieving :
Automated sieving
(Message 158285)
Posted 178 days ago by rogue
For n between 1e6 and 2e6 you will likely need to sieve more deeply than 1e15.
I started n!6 earlier this year to 1e6 and I could sieve about 1e13 a month. The removal rate was well below what I would need if I were to test to the max n in the sieve. I stopped sieving at 5e13 and am PRP testing now. I guesstimated that I would need to sieve to about 5e14 to fully sieve the range. Since n! is much larger than n!6, I'm thinking that 2e16 will be closer to optimal sieving depth, but that is just a guess.
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5)
Message boards :
Sieving :
Automated sieving
(Message 157489)
Posted 222 days ago by rogue
Is there a need for an automated sieving system?
Simply put, a way for a server to maintain a db with clients connecting and getting sieve ranges to work on then returning factors?
It doesn't seem to me that such a thing exists, but that such a thing might provide value.
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6)
Message boards :
Problems and Help :
Genefer issues
(Message 156916)
Posted 269 days ago by rogue
No the cpu and the gpu use totally different memory resources so no chance of that happening I'm only talking about your cpu cores.
I'm not certain that is entirely true. I believe that using the M1/M2 CPUs from Apple use memory shared by by CPU and GPU.
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7)
Message boards :
Problems and Help :
Identical Machines, Very Different Elapsed Times
(Message 156867)
Posted 273 days ago by rogue
Does one of the machines have hyperthreading enabled and the other does not?
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8)
Message boards :
Number crunching :
Pi Approximation Day Challenge
(Message 156698)
Posted 295 days ago by rogue
I'm confused at how PPS is being managed now. Most of the p < 50 do not have tests loaded in PPS or PPS Mega and yet there seems to be a gap between what has been tested and the leading edge for other p in that range.
Also, it is very confusing that PPS Mega and PPS have overlapping k. Would it make sense to remove k < 740 from the PPS Mega stats and merge those in the PPS so that they can be found in a single place? I'm guessing the answer is "no" due to how PrimeGrid retains details on completed tests.
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9)
Message boards :
General discussion :
PPS nearing end of life
(Message 156482)
Posted 309 days ago by rogue
I'm surprised that the current challenge has wiped out the remaining candidates < 1M digits so quickly, although many of those tests are not completed yet.
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10)
Message boards :
General discussion :
PPS nearing end of life
(Message 156398)
Posted 313 days ago by rogue
It looks the rest of the PPS takes for k <1200 that are less than 1e6 digits have been loaded. This would be a good time of everyone to guess when the last task (not a double-check) will be handed out.
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