| From: | Dave Page <dpage(at)pgadmin(dot)org> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: O_DSYNC broken on MacOS X? |
| Date: | 2010-09-30 20:09:11 |
| Message-ID: | AANLkTi=AzuOvfe6Vpe6vPpdh+X6x-aJWMt9wY38bPgg9@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Thu, Sep 30, 2010 at 8:26 PM, Robert Haas <robertmhaas(at)gmail(dot)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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