Re: Just-in-time Background Writer Patch+Test Results

"Kevin Grittner" <Kevin.Grittner@wicourts.gov> writes:
> On Thu, Sep 6, 2007 at 11:27 AM, in message
> <Pine.GSO.4.64.0709061121020.14491@westnet.com>, Greg Smith
> <gsmith@gregsmith.com> wrote: 
>> With the default delay of 200ms, this has the LRU-writer scanning the 
>> whole pool every 1 second,
>  
> Whoa!  Apparently I've totally misread the documentation.  I thought that
> the bgwriter_lru_percent was scanned from the lru end each time; I would
> not expect that it would ever get beyond the oldest 10%.

I believe you're correct and Greg got this wrong.  I won't draw any
conclusions about whether the LRU stuff is actually doing you any good
though.
        regards, tom lane