[Starpu-devel] CUDA Allocate problem

[Berenger Bramas <berenger.bramas@inria.fr>]

Hi,

We face a problem with StarPU and CUDA in some simulations.

The error is:

"oops in allocate_vector_buffer_on_node (datawizard/interfaces/vector_interface.c:264)... 4: unspecified launch failure"

In this case the error runs in a infinite loop (creating output file of Giga bytes! my best shot was 200 Go for an output file thanks to that).

But I also sometime get a message saying that CUDA memory is full:

"CUDA Error: out of memory"

(and even after this message the simulation continue sometimes)

We do not allocate memory by our-self during the simulation.

(But we have to mem copy to symbol at the beginning).

The size of block we are declaring with the handle are around 50MB.

I do not know if it is meaningful, but the ratio TIME TO COMPUTE  / SIZE OF DATA is small (huge data for small computational time => lots of transfer)

Any ideas?

(I can give .cu files or any other things if needed).

Thanks a lot.

Bérenger Bramas

HiePACS Project

Tel (05 24 57) 40 76
INRIA BORDEAUX Sud Ouest