On Sat, Jun 8, 2013 at 9:21 PM, Albert <[email protected]> wrote: > Hello: > > Recently I found a strange question about Gromacs-4.6.2 on GPU workstaion. > In my GTX690 machine, when I run md production I found that the ECC is on. > However, in my another GTX590 machine, I found the ECC was off: > > 4 GPUs detected: > #0: NVIDIA GeForce GTX 590, compute cap.: 2.0, ECC: no, stat: compatible > #1: NVIDIA GeForce GTX 590, compute cap.: 2.0, ECC: no, stat: compatible > #2: NVIDIA GeForce GTX 590, compute cap.: 2.0, ECC: no, stat: compatible > #3: NVIDIA GeForce GTX 590, compute cap.: 2.0, ECC: no, stat: compatible > > moreover, there is only two GTX590 in the machine, I don't know why Gromacs > claimed 4 GPU detected. However, in my another Linux machine which also have > two GTX590, Gromacs-4.6.2 only find 2 GPU, and ECC is still off. > > I am just wondering: > > (1) why in GTX690 the ECC can be on while it is off in my GTX590? I compiled > Gromacs with the same options and the same version of intel compiler
Unless your 690 is in fact a Tesla K10 it does surely not support ECC! Note that ECC is not something I personally think you really need. > > (2) why in machines both of physically installed two GTX590 cards, one of > them was detected with 4 GPU while the other was claimed contains two GPU? > Both GTX 590 and 690 are dual-chip boards which means two independent processing units with their own memory mounted on the same card and connected by a PCI switch (NVIDIA NF200). Hence, the two GPUs on these dual-chip boards will be enumerated as a separate devices. You can double-check this in nvidia-smi which should give the same devices as what mdrun reports. I suspect that one of the GPUs which is shown to have only two GPUs suffers from some hardware or software issues. Regards, Szilard > thank you very much > > best > Albert > -- > gmx-users mailing list [email protected] > http://lists.gromacs.org/mailman/listinfo/gmx-users > * Please search the archive at > http://www.gromacs.org/Support/Mailing_Lists/Search before posting! > * Please don't post (un)subscribe requests to the list. Use the www > interface or send it to [email protected]. > * Can't post? Read http://www.gromacs.org/Support/Mailing_Lists -- gmx-users mailing list [email protected] http://lists.gromacs.org/mailman/listinfo/gmx-users * Please search the archive at http://www.gromacs.org/Support/Mailing_Lists/Search before posting! * Please don't post (un)subscribe requests to the list. Use the www interface or send it to [email protected]. * Can't post? Read http://www.gromacs.org/Support/Mailing_Lists
