Date: Wed, 22 Jun 2016 13:02:41 +0300 From: Konstantin Belousov <kostikbel@gmail.com> To: Maxim Sobolev <sobomax@freebsd.org> Cc: John Baldwin <jhb@freebsd.org>, Adrian Chadd <adrian@freebsd.org>, Alan Somers <asomers@freebsd.org>, Alan Cox <alc@rice.edu>, Alan Cox <alc@freebsd.org>, freebsd-current <freebsd-current@freebsd.org>, performance@freebsd.org, "current@freebsd.org" <current@freebsd.org> Subject: Re: PostgreSQL performance on FreeBSD Message-ID: <20160622100241.GM38613@kib.kiev.ua> In-Reply-To: <CAH7qZfuAtHtUG92wEjPhOZ=BGgyFS728uigjJoD0pG%2B-mtUSww@mail.gmail.com> References: <20140627125613.GT93733@kib.kiev.ua> <CAJ-Vmom-M=R=FaBfHE5c2%2BYxW0SLmJTdFJD8tW4_aOD7MDNwzA@mail.gmail.com> <CAJ-Vmomt=WYjct%2BzsTbHuryxqYp7ELyS52LOb4NEsfENQ1yj1w@mail.gmail.com> <1603235.2ShtoCfSqO@ralph.baldwin.cx> <CAH7qZfuAtHtUG92wEjPhOZ=BGgyFS728uigjJoD0pG%2B-mtUSww@mail.gmail.com>
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On Tue, Jun 21, 2016 at 12:48:00PM -0700, Maxim Sobolev wrote: > Thanks, Konstantin for the great work, we are definitely looking forward to > get all those improvements to be part of the default FreeBSD kernel/port. > Would be nice if you can post an update some day later as to what's > integrated and what's not. I did posted the update several days earlier. Since you replying to this thread, it would be not unreasonable to read recent messages that were sent. > > Just in case, I've opened #14206 with PG to switch us to using POSIX > semaphores by default. Apart from the mentioned performance benefits, SYSV > semaphores are PITA to deal with as they come in very limited quantities by > default. Also they might stay around if PG dies/gets nuked and prevent it > from starting again due to overflow. We've got some quite ugly code to > clean up those using ipcrm(1) in our build scripts to deal with just that. > I am happy that code could be retired now. Named semaphores also stuck around if processes are killed without cleanup.
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