On Mon, Mar 28, 2016 at 2:06 PM, Peter Geoghegan <p...@heroku.com> wrote:
> On Mon, Mar 28, 2016 at 12:55 AM, Oleg Bartunov <obartu...@gmail.com> > wrote: > > We'll post the patch. > > Cool. > > > Teodor made something to get abbreviated keys work as > > I remember. I should say, that 27x improvement I got on my macbook. I > will > > check on linux. > > I think that Linux will be much faster. The stxfrm() blob produced by > Mac OSX will have a horribly low concentration of entropy. For an 8 > byte Datum, you get only 2 distinguishing bytes. It's really, really > bad. Mac OSX probably makes very little use of strxfrm() in practice; > there are proprietary APIs that do something similar, but all using > UTF-16 only. > Yes, Linux is much-much faster, I see no difference in performance using latest icu 57_1. I tested on Ubuntu 14.4.04. But still, icu provides us abbreviated keys and collation stability, so let's add --with-icu. > > -- > Peter Geoghegan >
