Re: O_DSYNC broken on MacOS X?
| От | Dave Page |
|---|---|
| Тема | Re: O_DSYNC broken on MacOS X? |
| Дата | |
| Msg-id | AANLkTi=AzuOvfe6Vpe6vPpdh+X6x-aJWMt9wY38bPgg9@mail.gmail.com обсуждение исходный текст |
| Ответ на | O_DSYNC broken on MacOS X? (Robert Haas <robertmhaas@gmail.com>) |
| Ответы |
Re: O_DSYNC broken on MacOS X?
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| Список | pgsql-hackers |
On Thu, Sep 30, 2010 at 8:26 PM, Robert Haas <robertmhaas@gmail.com> wrote: > Jayant Kumar did some benchmarking of InnoDB vs. PostgreSQL and PG > came out 5 times faster. The benchmark isn't very thoroughly > described, but it turns out not to matter. > > http://jayant7k.blogspot.com/2010/09/database-speed-tests-mysql-and.html > > Apparently, the reason we're faster is that wal_sync_method = > open_datasync, which is the default on MacOS X, doesn't actually work. That might be true, but if you check the comments, Jayant replied to say: @Andrew : I am running linux - ubuntu 10.04 - kernel 2.6.32-24. Linux does not support fsync_writethrough http://www.westnet.com/~gsmith/content/postgresql/TuningPGWAL.htm So I don't think that invalidates his benchmark. Something else might of course... -- Dave Page Blog: http://pgsnake.blogspot.com Twitter: @pgsnake EnterpriseDB UK: http://www.enterprisedb.com The Enterprise Postgres Company
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