On Tuesday, December 10, 2013, Tom Lane wrote: > Jeff Janes <jeff.ja...@gmail.com <javascript:;>> writes: > > On Tue, Dec 3, 2013 at 11:39 PM, Claudio Freire > > <klaussfre...@gmail.com<javascript:;> > >wrote: > >> Problem is, Postgres relies on a working kernel cache for checkpoints. > >> Checkpoint logic would have to be heavily reworked to account for an > >> impaired kernel cache. > > > I don't think it would need anything more than a sorted checkpoint. > > Nonsense. We don't have access to the physical-disk-layout information > needed to do reasonable sorting; to say nothing of doing something > intelligent in a multi-spindle environment, or whenever any other I/O > is going on concurrently. >
The proposal I was responding to was simply to increase shared_buffers to 80% of RAM *instead of* implementing directIO. Cheers, Jeff
