Date: Sun, 22 Mar 2015 15:11:20 +0300 (MSK) From: Dmitry Morozovsky <marck@rinet.ru> To: Konstantin Belousov <kostikbel@gmail.com> Cc: svn-src-head@freebsd.org, Mark Linimon <linimon@lonesome.com>, svn-src-all@freebsd.org, src-committers@freebsd.org Subject: Re: svn commit: r280323 - head/sys/kern Message-ID: <alpine.BSF.2.00.1503221509370.71864@woozle.rinet.ru> In-Reply-To: <20150321212416.GU2379@kib.kiev.ua> References: <201503211501.t2LF1Kj8052521@svn.freebsd.org> <20150321210341.GC15857@lonesome.com> <20150321210810.GT2379@kib.kiev.ua> <alpine.BSF.2.00.1503220014150.60253@woozle.rinet.ru> <20150321212416.GU2379@kib.kiev.ua>
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On Sat, 21 Mar 2015, Konstantin Belousov wrote: > > > > > Somewhat modernize the SysV shm code: > > > > > > > > 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. Yes, starting from 9.3 main buffers are memory-mapped. SysV SHM and Semaphores *are* still in use though. (mainly for search engines) Thanks for the clarification. -- Sincerely, D.Marck [DM5020, MCK-RIPE, DM3-RIPN] [ FreeBSD committer: marck@FreeBSD.org ] ------------------------------------------------------------------------ *** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- marck@rinet.ru *** ------------------------------------------------------------------------
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