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).
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
