Date: Sun, 22 Mar 2015 00:16:22 +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.2.00.1503220014150.60253@woozle.rinet.ru> In-Reply-To: <20150321210810.GT2379@kib.kiev.ua> References: <201503211501.t2LF1Kj8052521@svn.freebsd.org> <20150321210341.GC15857@lonesome.com> <20150321210810.GT2379@kib.kiev.ua>
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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) > But note that the code changed only works during shared segment creation and > teardown. Page faults are handled by the same VM code as it was before. > > In other words, I expect that nothing changes WRT benchmarks. On the other hand, I also do not see anything that could change benchmarks significally -- 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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