get_kernel_preferred_work_group_size_multiple
Returns the preferred multiple of work-group size for launch.
Description
This kernel query function returns the preferred multiple of work-group
size for launch. This is a performance hint.
Specifying a work-group size that is not a
multiple of the value returned by this query
as the value of the local work size argument
to enqueue_kernel will not fail to
enqueue the block for execution unless the
work-group size specified is larger than the
device maximum.
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