https://bugs.launchpad.net/ubuntu/+source/pyopencl/+bug/1354086
It may help to wait for one run of the kernel to finish before starting the next: for me, repeated pyopencl.enqueue_copy(cq0,bCL.data,aCL.data) leaks memory (sometimes ending in a crash, sometimes a whole-system hang) but repeated pyopencl.enqueue_copy(cq0,bCL.data,aCL.data).wait() doesn't.
Also note that frequently creating and deleting objects may be slow (compared to reusing existing ones) even when it doesn't crash.
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