"Min Xu (Hsu)" <xu(at)cs(dot)wisc(dot)edu> writes:
> ... As you said, however, experimental results
> shows fetching read-only lines didn't help, which led me wonder whether the
> second scenario your described was really happening.
I don't know --- we haven't tried it. I do intend to work up some
patches for these ideas, and then we can test them.
Or, if you happen to be wide awake at the moment, feel free to take a
shot at it ... I'm out of steam and won't get to it before tomorrow...
regards, tom lane