Bruce,

Thanks for your comments, and let me answer to your question.
Sigres is *not* significantly faster than just creating a file system on the permanent memory and putting xlog on there. Sigres is slightly faster than the case because each backend does not call XLogWrite while bgWriter does.


-- Hideyuki

Bruce Momjian wrote:
Tom Lane wrote:
Gene <[EMAIL PROTECTED]> writes:
... just my two cents. on a side note, would putting the wal on a
tmpfs partition give you something similar?
Indeed, I'm wondering why one needs to hack the Postgres core to throw
away data integrity guarantees; there are plenty of ways to do that
already :-(.  Hideyuki-san has not explained exactly what integrity
assumptions he wants to make or not make.  I'm surely willing to listen
to supporting a different set of assumptions than we currently use, but
I'd like to see a clear explanation of what assumptions are being made
and why they represent a useful case.

I am unsure why Sigres is significantly faster than just creating a file
system on the permanent memory and putting xlog on there.




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