svn commit: r280323 - head/sys/kern

[Konstantin Belousov]

On Sun, Mar 22, 2015 at 12:16:22AM +0300, Dmitry Morozovsky wrote:
> On Sat, 21 Mar 2015, Konstantin Belousov wrote:
> 
> > > >   Somewhat modernize the SysV shm code:
> > > 
> > > Interesting.
> > > 
> > > Is my understanding correct that postgres still uses shm?  If so,
> > > has someone benchmarked the speedup?
> > 
> > Yes, some versions of Postgres still use SysV shm.  
> 
> To be clarified: IIUC, *all* contemporary versions of PostgreSQL do
> use SHM for shatrd buffers (as PgSQL use process-per-connection model)
>
No.  Recent versions use mmaped shared region for buffers.