Date: Wed, 27 Aug 2008 14:42:20 -0500 From: "Andrew Gould" <andrewlylegould@gmail.com> To: Albert.Shih@obspm.fr Cc: freebsd-questions@freebsd.org Subject: Re: kern.ipc.sem* and postgresql Message-ID: <d356c5630808271242l44959dc3uc583e507182fb790@mail.gmail.com> In-Reply-To: <20080827191057.GA46302@pcjas.obspm.fr> References: <20080827191057.GA46302@pcjas.obspm.fr>
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On Wed, Aug 27, 2008 at 2:10 PM, Albert Shih <Albert.Shih@obspm.fr> wrote: > Hi all > > Classic question but I don't find the answers by google. > > If I've server with X procs, N Go ram and if the only purpose of this > server is to run a postgresql daemon how can I known/calculate what I mus= t > give to those variable > > set kern.ipc.semmni=3D? > set kern.ipc.semmns=3D? > set kern.ipc.semmnu=3D? > > and > > kern.ipc.shmall=3D? > kern.ipc.shmmax=3D? > kern.ipc.semmap=3D? > > Once those variables is determined how can I known/calculate the variable > in postgresql.conf ? > > shared_buffers =3D 32MB # min 128kB or max_connections*= 16kB > # (change requires restart) > #temp_buffers =3D 8MB # min 800kB > #max_prepared_transactions =3D 5 # can be 0 or more > # (change requires restart) > # Note: Increasing max_prepared_transactions costs ~600 bytes of shared > # memory > # per transaction slot, plus lock space (see max_locks_per_transaction). > #work_mem =3D 1MB # min 64kB > #maintenance_work_mem =3D 16MB # min 1MB > #max_stack_depth =3D 2MB # min 100kB > # - Free Space Map - > max_fsm_pages =3D 204800 # min max_fsm_relations*16, 6 b= ytes > each > # (change requires restart) > #max_fsm_relations =3D 1000 # min 100, ~70 bytes each > # (change requires restart) > > # - Kernel Resource Usage - > > #max_files_per_process =3D 1000 # min 25 > > ? > > Regards. > > JAS > -- > Albert SHIH > SIO batiment 15 > Observatoire de Paris Meudon > 5 Place Jules Janssen > 92195 Meudon Cedex > Heure local/Local time: > Mer 27 ao=FB 2008 21:06:02 CEST I used to perform financial/clinical data analysis using a PostgreSQL serve= r on FreeBSD, which entailed complex questions and a lot of data processing per query. I adjusted the PostgreSQL server using the configuration files; but never found a need to adjust the FreeBSD kernel. You can find information to help you at the links below. Managing Kernel Resources section of the manual: http://www.postgresql.org/docs/current/static/kernel-resources.html Hardware performance tuning section of the PostgreSQL manual: http://www.postgresql.org/files/documentation/books/aw_pgsql/hw_performance= / Global User Configuration Guide at Varlena's website: http://www.varlena.com/varlena/GeneralBits/Tidbits/annotated_conf_e.html Best of luck, Andrew
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