On Jun 14, 2007, at 7:21 AM, Heikki Linnakangas wrote:
We have these GUC variables that define a fraction of something:
#autovacuum_vacuum_scale_factor = 0.2 # fraction of rel size before
#autovacuum_analyze_scale_factor = 0.1 # fraction of rel size before
#bgwriter_lru_percent = 1.0 # 0-100% of LRU buffers scanned/round
#bgwriter_all_percent = 0.333 # 0-100% of all buffers scanned/round
Autovacuum settings use fractions, and bgwriter settings use a
percentage. Fortunately these settings are not related so there's
not too much potential for confusion, but it seems we should have a
common way to define settings like that.
A nice way would be that the base unit would be a fraction, like in
the autovacuum settings, but you could add a %-sign to give it as a
percent, just like you can use KB/MB etc. I'm not sure if we can do
anything for those without breaking backwards-compatibility, though.
Any ideas? The load distributed checkpoints patch adds one more GUC
variable like. I'm inclined to follow the example of the bgwriter
settings because it's more closely related to them, though I like
the autovacuum style more.
We could create bgwrite_*_fraction (portion?) and deprecate
Jim Nasby [EMAIL PROTECTED]
EnterpriseDB http://enterprisedb.com 512.569.9461 (cell)
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