Re: Acclerating INSERT/UPDATE using UPS

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
downloadSigres 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.

Sincerely,

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
differentfrom 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
softwarecan be accepted or not. Could you please give me some comments ?
 
> 
> Best Regards,
> 
> -- Hideyuki Kawashima 
> Assistant Professor, University of Tsukuba
> 
> 
> 
> ---------------------------(end of broadcast)---------------------------
> TIP 1: if posting/reading through Usenet, please send an appropriate
>        subscribe-nomail command to majordomo@postgresql.org so that your
>        message can get through to the mailing list cleanly
> 


-- 
     === The PostgreSQL Company: Command Prompt, Inc. ===
Sales/Support: +1.503.667.4564 || 24x7/Emergency: +1.800.492.2240
Providing the most comprehensive  PostgreSQL solutions since 1997            http://www.commandprompt.com/

Donate to the PostgreSQL Project: http://www.postgresql.org/about/donate
PostgreSQL Replication: http://www.commandprompt.com/products/