Hideyuki Kawashima wrote:
> Hello PostgreSQL Hackers,
> I have made a modification of PostgreSQL which accelerates INSERT/UPDATE 
> using UPS. The name of the software is "Sigres", and the philosophy is 
> considering a battery supplied memory as a persistent device instead of a 
> disk. You can download Sigres from http://sourceforge.jp/projects/sigres/ .
> In the maximum case, Sigres is 7 times faster than PostgreSQL default 
> (fsync=on) in my environment (CoreDuo 2.66GHz, UDMA/133), and it is also 10% 
> faster than PostgreSQL without fsync (fsync=off).

Interesting and what happens when the UPS fails? My main concern is that
one of the purposes of PostgreSQL is data integrity. I am all for every
performance enhancement we can achieve, that does *not* sacrifice that.


Joshua D. Drake

> The magic lies in usually skipping XLogWrite() and ignoring WALWriteLock. The 
> exceptions are XLogWrite() calls from AdvanceXLInsertBuffer(). In addition, 
> in XLogFileClose() issue_xlog_fsync() before close(). (In this point, Sigres 
> is different from just simply setting fsync=off.)
> Although I think Sigres can be considered as one of the future directions of 
> PostgreSQL, I do not know whether this software can be accepted or not. Could 
> you please give me some comments ?
> Best Regards,
> -- Hideyuki Kawashima 
> Assistant Professor, University of Tsukuba
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