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

[Cyril Bordage <cyril.bordage@inria.fr>]

Thank you for your answer, I will do that.


Cyril.


Le 21/10/2013 16:32, Samuel Thibault a écrit :
> Cyril Bordage, le Mon 21 Oct 2013 16:12:59 +0200, a écrit :
>> The "out of memory" can occur at different locations.
>> I have found one example again : in cudaMemset for the initialization of
>> a redux handle.
> 
> D'oh, cudaMemset running out of memory...
> 
>> #3  0x00007fffec920322 in __GI___assert_fail (assertion=0x4ae460 "_b ==
>> cudaSuccess", file=0x4ae435 "utils/starpu.c", line=157,
>>     function=0x4ae640 <__PRETTY_FUNCTION__.14205>
>> "init_vector_cuda_func") at assert.c:101
>> #4  0x000000000043e16a in init_vector_cuda_func (buffers=0x7fff7f244978,
>> cl_arg=0x0) at utils/starpu.c:157
> 
> And we clearly don't want to make you systematically check for out of
> memory conditions in cudaMemset calls...
> 
> I guess we don't really have another better option than defaulting to
> using only e.g. 90% of the available memory, to let cuda have 10% for
> its own uses. You can already do that easily by setting e.g.
> 
> export STARPU_LIMIT_CUDA_MEM=3600
> 
> if your GPUs have 4GiB memory.
> 
> Samuel
>