Horrible PostgreSQL performance with NFS
brooks at one-eyed-alien.net
Wed Jan 18 17:11:18 PST 2006
On Wed, Jan 18, 2006 at 06:58:47PM -0600, Jim C. Nasby wrote:
> On Sat, Jan 14, 2006 at 06:42:02AM -0800, Arne Woerner wrote:
> > Did you do those "dd" tests with small block sizes (like 1byte:
> > bs=1), like somebody on one of those lists suggests, too? Then we
> > could see, if there is a high latency that ruins everything...
> FYI, PostgreSQL does 8kB I/O by default. This can only be changed by
> modifying a header file.
That's definitely small in my book (certainly compared to the 1MB block
size the first responder suggested), knowing that, you should
definitely do dd tests with 8k blocks since that's the best performance you
are likely to get.
Any statement of the form "X is the one, true Y" is FALSE.
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