Hi Jan, On Mon, 22 Nov 2010 17:17:04 +0100, Jan Meinke <[email protected]> wrote: > cl.enqueue_write_buffer(queue, a_dev, orig.astype(np.float32))
This is your bug. The memory that e_w_b reads from has to be kept alive until the transfer finishes. In this case, the garbage collector throws it away right after you start the transfer. I'm wondering whether we should default cl.enqueue_write_buffer's is_blocking to True, which would eliminate this whole class of problems. FWIW, I've been bitten by this same issue. Opinions? Ideas on how to do this without breaking API? (Rename e_w_b?) HTH, Andreas
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