Heikki Linnakangas wrote:
Here's an updated WIP version of the LDC patch. I just spreads the writes, that achieves the goal of smoothing the checkpoint I/O spikes. I think sorting the writes etc. is interesting but falls in the category of further development and should be pushed to 8.4.


Why do you think so? Is it too much risk to adapt the sorted writes? The numbers shown by ITAGAKI Takahiro looked quite impressive, at least for large shared_buffers configurations. The reactions where rather positive, too.

In general, I am hoping that this patch, together with "Automatic adjustment of bgwriter_lru_maxpages" will finally make default postgresql configurations experience much less impact from check points. For my tast, postgresql has recently got way to many nobs which one must tweak by hand... I welcome any approach on auto-tuning (and auto vacuum!).

Patch status says "waiting on update from author":
http://archives.postgresql.org/pgsql-patches/2007-04/msg00331.php
Any updates on this?

Best Regards
Michael Paesold


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