On Fri, 2003-10-17 at 16:22, Greg Stark wrote:
> If it's just a matter of all the read i/o from vacuum then we're best off
> sleeping for a few milliseconds every few kilobytes. If it's the cache then
> we're probably better off reading a few megabytes and then sleeping for
> several seconds to allow the other buffers to get touched and pushed back to
> the front of the LRU.
Uh, no -- if it is the cache, we're better off fixing the buffer
replacement policy, not trying to hack around it. Replacement policies
that don't suffer from sequential flooding are well known.
-Neil
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