Re: Use pread and pwrite instead of lseek + write and read

Oskari Saarenmaa <os@ohmu.fi> writes:
> On my laptop a simple pgbench run (scale 100, 15 minutes) shows a 1.5% 
> performance improvement.

I would have hoped for a lot better result before anyone would propose
that we should deal with all the portability issues this'll create.

> A 1.5% performance improvement is small but 
> measurable - and IMV more importantly it allows us to drop more than 100 
> lines of backwards (compatible?) code; maybe we could start targeting 
> more recent platforms in v10?

That's basically nonsense: we'll end up adding way more than that to
deal with platforms that haven't got these APIs.
        regards, tom lane