espressomd-users
[Top][All Lists]
Advanced

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [ESPResSo-users] CUDA error: out of memory


From: Markus Gusenbauer
Subject: Re: [ESPResSo-users] CUDA error: out of memory
Date: Fri, 02 Aug 2013 11:39:17 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130329 Thunderbird/17.0.5

You are absolutely right, it is a 2GB GPU, thanks for the info! Can I use more than 1 GPU for a simulation?

Markus


On 02.08.2013 11:17, Stefan Kesselheim wrote:
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





reply via email to

[Prev in Thread] Current Thread [Next in Thread]