On Fri, 2003-11-14 at 10:32, Jan Wieck wrote:
> Bruce Momjian wrote:
> > Jan Wieck wrote:
> >> Christopher Browne wrote:
> >>
> >> > elein@varlena.com (elein) writes:
> >> >> What is the status of CVS head? Isn't it in sync with 7.4.RC2? I
> >> >> just upgraded from CVS and rebuilt clean and initdb now gives this
> >> >> lovely informative initdb failed message.
> >> >
> >> > No, I believe that they have started applying 7.5 patches, notably
> >> > including reimplementing initdb in C.
> >> >
> >> > Jan checked in the ARC changes last night, and he and Tom ran into
> >> > some problems, leading to that being pulled back out, while he
> >> > revisits the code.
> >>
> >> Yeah, there was a problem with *extreme* sharing ... the code tried to
> >> use the same buffer for multiple disk blocks at the same time, and
> >> somehow the backends did not agree on the correct content. But it's
> >> fixed and back in. You can see ARC working by setting
> >>
> >> buffer_strategy_status_interval = 10 # seconds
> >>
> >> and starting postmaster with -d1
> >
> > It is not on by default?
> >
>
> Sure not. Why would someone turn on debug messages by default?
>
> Or did you mean ARC itself? Since it replaced the old LRU code, it is
> the only choice you have now. Which sort of raises the question if we
> would want to have multiple choices, like a config option
>
> buffer_replacement_strategy = lru|lru2|arc
>
people would always want to have those choices (especially for doing
development/testing/benchmarking between the different methods) the
question is is it worth the effort to give people those options?
Robert Treat
--
Build A Brighter Lamp :: Linux Apache {middleware} PostgreSQL
