8 GPU limit linuxcoin - page 2. | Bitcointalksearch.org

DeathAndTaxes

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Activity: 1218

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Gerald Davis

Quote from: imsaguy on November 08, 2011, 04:12:38 PM

Its a hardcoded driver issue on both ati and nvidia. The 32bit was for obvious reasons, the 64bit seems less clear why.

Exactly any claim of resource issue is BS.

x86-64 supports 2^64 bit memory space.
Current CPU only support 2^48 bit memory space.
Windows further limits that to 2^44 bit memory space for some unknown reason but that is still more than enough.

There is sufficient virtual memory space to map couple thousand video cards.

cicada

full member

Activity: 196

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jjiimm_64, when you add the 5th card what happens?

Does aticonfig see the card at all, or seem to just ignore it?
Does 'lspci' list all 5 cards?

I'm curious if firing up a second X session tied only to the 5th card may be able to get around the problem..

imsaguy

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Don't send me a pm unless you gpg encrypt it.

Quote from: cicada on November 08, 2011, 04:10:46 PM

Quote from: pirateat40 on November 08, 2011, 04:05:25 PM

If its the same issues as with windows its a hardware limit based on resources.

Quote from: imsaguy on November 08, 2011, 04:07:49 PM

Both Windows and Linux are limited to 8 cores on 64bit and 4 cores on 32bit.

Either of you have a reference for that? It sounds like a BS answer made up by ATI developers who didn't want to try harder. There is no hardware limitation outside of the number of physical available ports. A software limitation I could see, as they'd possibly run out of address space in the 32bit drivers when looking at more than 32GB of VRAM Cheesy

Its a hardcoded driver issue on both ati and nvidia. The 32bit was for obvious reasons, the 64bit seems less clear why.

cicada

full member

Activity: 196

Merit: 100

Quote from: pirateat40 on November 08, 2011, 04:05:25 PM

If its the same issues as with windows its a hardware limit based on resources.

Quote from: imsaguy on November 08, 2011, 04:07:49 PM

Both Windows and Linux are limited to 8 cores on 64bit and 4 cores on 32bit.

Either of you have a reference for that? It sounds like a BS answer made up by ATI developers who didn't want to try harder. There is no hardware limitation outside of the number of physical available ports. A software limitation I could see, as they'd possibly run out of address space in the 32bit drivers when looking at more than 32GB of VRAM Cheesy

jjiimm_64

legendary

Activity: 1876

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Quote from: cicada on November 08, 2011, 03:57:27 PM

So far I haven't heard any solid take on whether or not more than 8GPU was possible using the linux catalyst driver - some say it's 8, some say it's 16, some say it's unlimited..

Are you asking because you're trying and can't get it to work, or just looking to see if it's possible?

If it's the former, let me be the first to call you insane Wink

If it's the latter, I'm not sure there's a definite answer. The only way to hit that limit is more than 4 dual-gpu cards in a motherboard with more than 4 PCI slots, both things are generally outside the greater reach of miner's pockets Tongue

It was the former, and I could not get it to work. 4 of my rigs are 4x5970 in a msiGD70 2900Mh pulling 1200 watts. the rig has 2 psu's and enough power to push all 5 cards if I could get them to work.

imsaguy

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Don't send me a pm unless you gpg encrypt it.

Both Windows and Linux are limited to 8 cores on 64bit and 4 cores on 32bit.

pirateat40

sr. member

Activity: 378

Merit: 250

"Yes I am a pirate, 200 years too late."

If its the same issues as with windows its a hardware limit based on resources.

cicada

full member

Activity: 196

Merit: 100

So far I haven't heard any solid take on whether or not more than 8GPU was possible using the linux catalyst driver - some say it's 8, some say it's 16, some say it's unlimited..

Are you asking because you're trying and can't get it to work, or just looking to see if it's possible?

If it's the former, let me be the first to call you insane Wink

If it's the latter, I'm not sure there's a definite answer. The only way to hit that limit is more than 4 dual-gpu cards in a motherboard with more than 4 PCI slots, both things are generally outside the greater reach of miner's pockets Tongue

jjiimm_64

legendary

Activity: 1876

Merit: 1000

Does anyone know a way around the 8 gpu limit in linuxcoin?

Does anyone run more then 8 gpus in their rigs?

Topic: 8 GPU limit linuxcoin - page 2. (Read 4626 times)