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Re: [ESPResSo-users] CUDA error: out of memory
From: |
Stefan Kesselheim |
Subject: |
Re: [ESPResSo-users] CUDA error: out of memory |
Date: |
Fri, 2 Aug 2013 11:17:05 +0200 |
Hi Markus,
yes, that is quite right. We need 19xN single precision float numbers per LB
cell, times two, because we stream from one lattice to a second lattice to
avoid race conditions.
200**3 cells *19 populations * 4 byte * 2 buffers=1216MB,
We need a bit more to save forces and so I'd conclude you have a 2GB GPU.
Cheers
Stefan
On Aug 2, 2013, at 11:01 AM, Markus Gusenbauer <address@hidden> wrote:
> Hi all,
>
> is the number of nodes with the LBM on GPU limited by hardware? When I choose
> too large simulation size, I get a CUDA out of memory error.
> Right now I am limited to around 8,320,000 nodes (200x200x208), after that it
> crashes.
>
> Example:
>
> setmd time_step 0.1
> setmd skin 0.2
> thermostat off
>
> set boxX 200
> set boxY 200
> set boxZ 208
>
> setmd box_l $boxX $boxY $boxZ
>
> lbfluid gpu grid 1 dens 1.0 visc 1.5 tau 0.1 friction 0.5
>
> set cycle 0
> while { $cycle<100 } {
> puts "$cycle / 100 \r";
>
> for { set i 1 } { $i < [expr $boxX-1]} { incr i } {
> for { set j 1 } { $j < [expr $boxY-1] } { incr j } {
> for { set k 0 } { $k < 1 } { incr k } {
> lbnode $i $j $k set u 0.0 0.0 0.001
> }
> }
> }
>
> integrate 1
> incr cycle
> }
>
>
> Thanks!
>
> Markus
>