1)
Message boards :
Problems and Help :
Private messages
(Message 162096)
Posted 28 days ago by  Grebuloner
I am running 2 PrimeGrid tasks on 12 threads of my Intel i5 CPU. Of course this suspends all tasks of other 6 projects I am running. But why PrimeGrid does not use my Intel Ie GPU? Einstein@home is using it on gamma ray pulsar data.
Tullio
You'll have to make sure "use Intel GPU" is checked as well as choosing a subproject for it in your venue preferences. But I'm not entirely sure PG actually works on Intel iGPUs without additional config files.
That being said: Many of us here in many posts strongly recommend you don't bother with it. The iGPU is extremely slow and has to share the resources of your CPU with its own work which slows everything down even more. It's a bit of a lose-lose for PG work.
As for running 2x6 threads on your 6c/12t i5, I recommend you read the multithreading sticky in the number crunching area. For prime finding subprojects (LLR2 stuff), you'll generally get the best performance by running only as many total threads as physical cores in the CPU. The post has many tips and instructions on how to do that and optimize the number of threads/tasks for the particular subproject you're running.
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2)
Message boards :
Cullen/Woodall prime search :
Cullen Woodall Sieve Resumed
(Message 162082)
Posted 28 days ago by Grebuloner
Noice. Just set my 2 big GPUs to get going once it's live and get that dangling old Ruby up to something fun.
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3)
Message boards :
Number crunching :
Credit Milestones
(Message 161692)
Posted 45 days ago by Grebuloner
One... two... five billion!
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4)
Message boards :
Problems and Help :
multiple GPUs
(Message 161336)
Posted 61 days ago by Grebuloner
Looking at your host, all the times are about the same. Where are you seeing the 6x difference?
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5)
Message boards :
Number crunching :
How to optimize the number of threads
(Message 161184)
Posted 71 days ago by Grebuloner
To me the numbers suggest that LLR is quite specific, but GFN something else?
Good question! Michael, is there a reason GFN21 and GFN22 both have a 40.5MB cache size?
What about AP27?
Thanks for doing this. It's nice to have an easy way to get FFT sizes without mining through others' tasks.
Could you perhaps include a blurb or two for those trying to figure out their cache sizes? E.g. "Look up your CPU on Wikipedia, find L3." (Although most recent AMD and some recent Intel chips are L2+L3...I know, it's not easy). Some other wording might help those with the split-cache multi-CCX CPUs from AMD.
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6)
Message boards :
Generalized Fermat Prime Search :
Simple explanation for Genefers and task size?
(Message 160172)
Posted 113 days ago by Grebuloner
I'm sure one of us would volunteer to run one of each app, just to get a general idea. No it won't be 100% accurate, because as you've said every PC is different. But it would give a vague idea of this app takes 15 times longer than this one, and a vague idea of someone with a CPU 3 times faster than the test machine will take a third of the time. A static page could then be made with these figures, so anyone coming along and wishing to run something which will take an hour on their particular GPU can make a pretty good guess.
Why can't it be you? You seem the most eager for it.
How would you determine relative run times from a single information point? If the benchmark is an AMD Ryzen 2700 at 4 GHz running an LLR2 subproject WU in 1 hour with one thread, how long should my Intel Core i9 10980XE at 4 GHz take to run the same WU? Or my Intel X5675 at 4 GHz?
I would also like to point out (because it's something I do) that it's pretty easy to just go to the top participants or computers pages and just click through the visible hosts/tasks to find systems of the same family or CPU and see how fast they are working through them.
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7)
Message boards :
Generalized Fermat Prime Search :
Simple explanation for Genefers and task size?
(Message 160152)
Posted 114 days ago by Grebuloner
Thanks Michael for the detailed answers. That makes a lot more sense to me now. I think you answered before I edited the post and added two more questions. Does the project itself have an opinion on which are the most important ones to search for? And is there anything useful to come from these numbers - presumably any correlation of things in maths is asking for a eureka moment and the furthering of everything in general. Somebody once said to me "maths is the basis of physics is the basis of everything".
Grebuloner: I picked the smallest genefers for 3 reasons - 1) to "tidy up" the lower numbers (I go onto Private GFN for that too), 2) because my multiple GPUs on multiple computers fly through them which looks cool on my Boinctasks list spread across 3 monitors, and 3) because I use antique GPUs which often screw up sometimes needing dismantled and repaired [1]. It's very irritating to have wasted a few days computation on a corrupted genefer extreme.
To both of you, are the numbers in a range infinite or not? You seem to disagree.
[1] Broken/old/unreliable GPUs accepted greatfully! I like repairing stuff! I'm in the UK if anyone has stuff they don't want....
My range reference was specifically to Primegrid and the software we run. As noted in other threads as software has been updated, there are technical upper limits to the numbers we can currently test. Ending a range/search might be because of a software limitation (like WW).
The great thing about PG is we have the opportunity to pick our projects for whatever reasons we want. I want to eliminate some k's in the conjectures, but I also love running up the badges so I change my focus around that (and my power bill...). Glad you found yours! :)
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8)
Message boards :
Generalized Fermat Prime Search :
Simple explanation for Genefers and task size?
(Message 160150)
Posted 114 days ago by Grebuloner
It's b^15 and b^20.
Do you mean b^32768 respectively b^1048576? /JeppeSN
Oops! Yes. I blame early Sunday morning brain fog.
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9)
Message boards :
Number crunching :
Tour de Primes 2023
(Message 160148)
Posted 114 days ago by Grebuloner
Just went to the basement to start some laundry and turning on the basement lights tripped a breaker. Oops.
Time to shuffle some systems around the house and maybe redistribute some GPUs.
That would be very scary if it was a single LED bulb in the basement. :)
Fortunately (or unfortunately?) there's a bit more than that. A few fluorescent tube hangers do the bulk of initial surging.
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10)
Message boards :
Number crunching :
Tour de Primes 2023
(Message 160116)
Posted 114 days ago by Grebuloner
Just went to the basement to start some laundry and turning on the basement lights tripped a breaker. Oops.
Time to shuffle some systems around the house and maybe redistribute some GPUs.
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