Re: Load Distributed Checkpoints, take 3

On Mon, 25 Jun 2007, Heikki Linnakangas wrote:

> It only scans bgwriter_lru_percent buffers ahead of the clock hand. If the
> hand isn't moving, it keeps scanning the same buffers over and over again.
> You can crank it all the way up to 100%, though, in which case it would work,
> but that starts to get expensive CPU-wise.

In addition to being a CPU pig, that still won't necessarily work because
the way the LRU writer ignores things with a non-zero usage_count.  If
it's dirty, it's probably been used recently as well.

--
* Greg Smith gsmith@gregsmith.com http://www.gregsmith.com Baltimore, MD