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I am using Postgres 8.1.4 on Linux. I am interested in calculating the following for a specific application:
How long it takes the operating system to fulfil a page demand, ie, reading the page from disk or from the OS cache to the Postgres shared buffer.
Also how long it takes the bgwriter to flush a page from the shared buffer into the OS cache or disk.
These can be averages or detailed info that I can analyze with other tools
Are there any functions/views available that log this information, if not where should I start in the source code.
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