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).
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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