Message boards : Graphics cards (GPUs) : Top hosts exceed 30,000+ RAC
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I just noticed that now two machines exceed the 30,000 mark of recent average credit. (Top Hosts) | |
ID: 6046 | Rating: 0 | rate: / Reply Quote | |
Care to share the specs of your host? | |
ID: 6047 | Rating: 0 | rate: / Reply Quote | |
It's a 64-bit Linux system with a total of 4 GT200 class CUDA devices, made possible due to the 2-in-1 GeForce GTX 295. The Phenom 9550 CPU cores are not so impressive as those of Core i7, but they always seem able to keep the GPUs satisfied. Actively running more than two CUDA devices required an upgrade from a 750 Watt to a 1000 Watt power supply, now a Zalman ZM1000-HP. | |
ID: 6051 | Rating: 0 | rate: / Reply Quote | |
Consider the Price of this AMD Phenom the delivered power is although impressive. Now you can upgrade to Phenom II and show me a Intel-System with such a plattform-compatibility. | |
ID: 6053 | Rating: 0 | rate: / Reply Quote | |
Sorry, but what are you talking about? This is about the GPUs.. you just need a board with 2 PCIe slots, 2 GTX 295 and preferrably 4 CPU cores, though on Linux less may do for 4 GPUs. | |
ID: 6071 | Rating: 0 | rate: / Reply Quote | |
Sorry, but what are you talking about? This is about the GPUs.. you just need a board with 2 PCIe slots, 2 GTX 295 and preferrably 4 CPU cores, though on Linux less may do for 4 GPUs. With 6.62 you might not even need that much on windows ... I am seeing less than 1% average CPU with that application. At that CPU rate you could even run all 4 GPU cores on a single CPU system (if we ignore bus bandwidth and CPU I/O bandwidth issues) ... ____________ | |
ID: 6073 | Rating: 0 | rate: / Reply Quote | |
J.D. wrote: Anyone care to speculate when the first machine will exceed 40K and 50K of RAC? :-) " If " the rig will crunch without producing computation errors and doesn't freeze I'd expect the 40K to be reached around the weekend... ;) (Knock on wood) | |
ID: 6100 | Rating: 0 | rate: / Reply Quote | |
Good luck mate! That would be almost half the output of my entire team.. :D | |
ID: 6139 | Rating: 0 | rate: / Reply Quote | |
Good luck mate! That would be almost half the output of my entire team.. :D Um, well that is what I would class as CPU I/O bandwidth, because the CPU has only the one channel to service the interrupts ... a rose by any other name ... But even a multi-core system still has potential issues with bandwidth for the same reason unless the MB has distinct and separate channels for each GPU to be serviced. Then we can get into the same issue with the dual, and soon to come quad, core systems where there is one I/O channel for each card and the two/four GPU cores are contending for service at the same time. This is an issue that has dogged PCs for, like, forever ... though the CPUs we use have more power than the CPUs of mainframes of yore the I/O is simply not really there ... they are getting there, slowly ... but, some of those old systems were masters at I/O ... In any case, my opinion we are in violent agreement ... | |
ID: 6142 | Rating: 0 | rate: / Reply Quote | |
" If " the rig will crunch without producing computation errors and doesn't freeze I'd expect the 40K to be reached around the weekend... ;) (Knock on wood) 40K! Even sooner than the weekend. :-) | |
ID: 6213 | Rating: 0 | rate: / Reply Quote | |
I was pleasantly surprised too...especially because the rig had freezes and produced computation errors... | |
ID: 6214 | Rating: 0 | rate: / Reply Quote | |
Um, well that is what I would class as CPU I/O bandwidth, because the CPU has only the one channel to service the interrupts ... a rose by any other name ... I'm still not convinced. Is there an interrupt at all? I don't know about the new method, but as far as I understand the polling is not an interrupt, it's just a normal task switch, which the scheduler would have done anyway. The way I see it: a single core executes only one thread at a time. Thus when multiple GPUs need work all except one are blocked.. no matter how much I/O bandwidth you give that cpu, it couldn't execute the other threads at the same time. If you have multiple CPUs (be it physical ones, more cores or logical ones via multithreading) then each of them can process one thread at the same time and, with otherwise perfect software, lags / breaks could be avoided. What I need is the ability to execute several threads at once, not I/O bandwidth. So.. I'm not sure if we're talking about the same thing ;) MrS ____________ Scanning for our furry friends since Jan 2002 | |
ID: 6257 | Rating: 0 | rate: / Reply Quote | |
Four GPUs and 4 CPU cores means one gpugrid WU/core and so, no WU in cache. I have a 2 cores CPU and a gtx295 (2 GPUs) and I can not get that the Boinc scheduler feeds them without my personal intervention (which, e.g., is impossible if I'm sleeping) (Boinc 6.6.3) | |
ID: 6307 | Rating: 0 | rate: / Reply Quote | |
Four GPUs and 4 CPU cores means one gpugrid WU/core and so, no WU in cache. I have a 2 cores CPU and a gtx295 (2 GPUs) and I can not get that the Boinc scheduler feeds them without my personal intervention (which, e.g., is impossible if I'm sleeping) (Boinc 6.6.3) As mentioned in another thread recently 6.6.3 has a problem with uninitialized variables. Sooner or later, it won't get GPU work reliably. Boinc version 6.5.0 seems to cause the least trouble; get it from here. Phoneman1 | |
ID: 6311 | Rating: 0 | rate: / Reply Quote | |
Couldn't keep my promise to reach 50K just in time (yesterday)... | |
ID: 6435 | Rating: 0 | rate: / Reply Quote | |
Yes, I thought also something like that was happening. | |
ID: 6436 | Rating: 0 | rate: / Reply Quote | |
When I saw that there were less than the usual eight tasks "in progress" I checked the previous task-sides, but with no success: I couldn't find any new ones. Also, after submitting these "ghosts" neither the 'avg. cr' nor the 'tot. cr' for this host did change... | |
ID: 6439 | Rating: 0 | rate: / Reply Quote | |
Ul1, your list of computers shows 4 x i7s but 3 have not contacted the server this month. Those 3 also have a number of work units marked no reply. I wonder if the missing work units are to be found on these i7s?? | |
ID: 6440 | Rating: 0 | rate: / Reply Quote | |
As you mentioned: these rigs haven't done anything for the project this month...but the days I was dealing with the 'ghosts' were late monday and the whole tuesday... | |
ID: 6449 | Rating: 0 | rate: / Reply Quote | |
Couldn't keep my promise to reach 50K just in time (yesterday)... Woo! 50K! Here too! Okay, so my machine took 12 days longer, but still. :-) Meanwhile, the stats haven't yet shown a machine over 60K... | |
ID: 6738 | Rating: 0 | rate: / Reply Quote | |
There are a some motherboards out now that can more than 2 full PCI-e slots. The ASUS P6T6 WS Revolution motherboard, for example, can run 3 boards in full x16 speed. Many will run 3 or more boards, but few will have them all at full x16. This board, and I believe there are a few others out there by other companies, could run 3 GTX295's at once at full speed, though I don't have the money to buy 3 of those right now. | |
ID: 6780 | Rating: 0 | rate: / Reply Quote | |
16 or 8x PCIe 2.0 is uncritical for now. It's a bit critical though to run 6 GPUs (3 cards) in one box.. concerning PSU, cooling and noise. | |
ID: 6785 | Rating: 0 | rate: / Reply Quote | |
pharrg wrote: There are a some motherboards out now that can more than 2 full PCI-e slots. The ASUS P6T6 WS Revolution motherboard, for example, can run 3 boards in full x16 speed. Many will run 3 or more boards, but few will have them all at full x16. This board, and I believe there are a few others out there by other companies, could run 3 GTX295's at once at full speed, though I don't have the money to buy 3 of those right now. Right at the moment I'm running 3 GTX295 combined with an ASUS Rampage II Extreme, 3 9800GX2 are used together with an ASUS P6T6 WS...and I've got an ASRock X58 SuperComputer capable of running 4 cards waiting for being tested with GTXs. So there are some boards out there now for a while waiting to be used for what they were designed for: heavy crunching... ;) MrS wrote: 16 or 8x PCIe 2.0 is uncritical for now. It's a bit critical though to run 6 GPUs (3 cards) in one box.. concerning PSU, cooling and noise. Both rigs are using 850W PSUs from Antec to feed the GPUs and i7-CPUs, both oc'ed...without any probs...and I got an 1250W Enermax PSU to be used if the four card configuration should work. All rigs are air-cooled...and about the noise: well, that's something one has to accept if he wants to run such highly performant rigs... ;) | |
ID: 6793 | Rating: 0 | rate: / Reply Quote | |
I was pleased to see that you are running 3 295's on a Rampage II Extreme, as I just ordered a new system yesterday with that same card and 2 295's but didn't know if it had room for a third one, my wallet on the other hand is not so pleased to learn this. I thought I was going to be able to put off an upgrade for quite a while but now instead I find myself already trying to figure out how toafford a third one Crunching is proving to be an expensive habit but I think I am hooked at this point. If CPU's were Coke, GPU's are most certainly Crack. | |
ID: 6794 | Rating: 0 | rate: / Reply Quote | |
You would need a case with 8 expansion slots to use three GTX295 together with an R II Ex, e.g. Lian Li V2010, Lian Li PC-P80 or an Lian Li V1000 Plus II (only 7 slots, but it will work)... | |
ID: 6795 | Rating: 0 | rate: / Reply Quote | |
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ID: 6803 | Rating: 0 | rate: / Reply Quote | |
Sorry, but I think it won't work in your case: the Lian Li I've mentioned has the mobo installed upside down, so there's some space between the end of the mobo and the top of the case, enough for the part of the GTX that's overlapping... | |
ID: 6805 | Rating: 0 | rate: / Reply Quote | |
Message boards : Graphics cards (GPUs) : Top hosts exceed 30,000+ RAC