Re: [Starpu-devel] Problems with memory in CUDA

[Nathalie Furmento <nathalie.furmento@labri.fr>]

On 21/10/2013 02:09, Cyril Bordage wrote:
> Hi,
>
> I call starpu_data_unregister_submit to free memory. It works well on
> CPUs, but only on CPUs, not on GPUs. To be more precise, I see, with
> nvidia-smi, only increasing in memory consumption. And it ends with a
> "error: out of memory". If I split my program into two passes, it works
> like a charm (no out of memory).
>
>
> Cyril.
>
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Cyril,

You should tell us more. Which version of StarPU ? Which machine ? What 
do you mean by  2 passes ?

There is currently a problem with the cuda allocation memory both in the 
trunk and the branch starpu-1.1 following the commit introducing the 
batch allocation of small CUDA allocations (<= 4MiB) to avoid the huge 
cudaMalloc overhead. You could try to disable it by setting the value of 
CHUNK_ALLOC_MAX to 0 in the file  src/datawizard/malloc.c

I have no ideas if both problems are linked though.

Cheers,

Nathalie