On 6/7/13 12:42 PM, Robert Haas wrote:
GUCs in terms of units that are meaningful to the user.  One could
have something like io_rate_limit (measured in MB/s),
io_read_multiplier = 1.0, io_dirty_multiplier = 1.0, and I think that
would be reasonably clear.

There's one other way to frame this:

io_read_limit = 7.8MB/s # Maximum read rate
io_dirty_multiplier = 2.0 # How expensive writes are considered relative to reads

That still gives all of the behavior I'd like to preserve, as well as not changing the default I/O pattern. I don't think it's too complicated to ask people to grapple with that pair.

Greg Smith   2ndQuadrant US    g...@2ndquadrant.com   Baltimore, MD
PostgreSQL Training, Services, and 24x7 Support www.2ndQuadrant.com

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