Thread

Re: [HACKERS] Problem with the numbers I reported yesterday

Boersenspielteam <boersenspiel@vocalweb.de> — 1998-02-12T15:41:45Z

Hi,

perhaps a stupid question:

What will happen, if you start PostgreSQL with -F and write a script 
which is a loop that fsyncs every 2 seconds? Does this lead to a 
database which is "almost" correct? Does this seem like a good 
compromise?

> > I ran my performance tests some more times and it seems the numbers are not
> > really comparable. When I run PostgreSQL without -F I get a sync after every
> > insert. With -F I get no sync at all as all inserts fit well into the
> > buffer. However, Oracle in comparison does sync. Simply hearing the disk
> > access it seems as if they sync every two or three seconds.
> > 
> > Does anyone know a way to really check both DBMSs?
> 
> Many dbms's do buffered logging, that is they sync after the buffer gets
> full or after a minute or so.  We have the logic to add buffered logging
> to PostgreSQL and will be doing it later.  Right now, we only have
> non-buffered logging, and no logging.
> 
> -- 
> Bruce Momjian
> maillist@candle.pha.pa.us
> 
> 

Ciao

Das Boersenspielteam.

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