Gregory Stark <stark@enterprisedb.com> writes:
> a) You wouldn't have to keep the lock while doing the I/O.
Hoo, yeah, so the period of holding the share-lock could well be
*shorter* than it is now. Most especially so if the write() blocks
instead of just transferring the data to kernel space and returning.
I wonder whether that could mean that it's a win to double-buffer
even if we aren't computing a checksum? Nah, probably not.
regards, tom lane