On Tue, Jan 12, 2016 at 12:57 AM, Andres Freund <and...@anarazel.de> wrote:>
> My theory is that this happens due to the sorting: pgbench is an update
> heavy workload, the first few pages are always going to be used if
> there's free space as freespacemap.c essentially prefers those. Due to
> the sorting all a relation's early pages are going to be in "in a row".
Not sure, what is best way to tackle this problem, but I think one way could
be to perform sorting at flush requests level rather than before writing
to OS buffers.