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I have reconstructed the PG prefetching algorithm, and it is worth mentioning that I use direct_hash for all hashtables, which means that I used
GINT_TO_POINTER
andGPOINTER_TO_INT
to convertobj_id
orobj_size
as the key or the value. Compared tog_int64_hash
, this can reduce the overhead of allocation, dereference, and memory release.Maybe there is a problem on a 32 bit machine, where
long
andvoid*
maybe are both 4 bytes. :(