hash table: use lookup instead of iteration #8
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When a Bitmain device reports a nonce, it also return a
work_id. Thecgpu_infoobject contains a queue of "in flight" work items, in a uthash hash table. Ultimately, the__find_work_byidfunction is used to locate the work item with the givenidin this hash table. It does this... by iterating over the hash table, although the ids are used as hash keys!This PR replaces iteration over the whole hash table by direct access to the right element, using the hash. It reduces CPU use when mining at very low difficulty.