Re: Checkpoint cost, looks like it is WAL/CRC

Josh Berkus <josh@agliodbs.com> writes:
> Looks like the CRC calculation work isn't the issue.   I did test runs of
> no-CRC vs. regular DBT2 with different checkpoint timeouts, and didn't
> discern any statistical difference.   See attached spreadsheet chart (the
> two different runs are on two different machines).

Um, where are the test runs underlying this spreadsheet?  I don't have a
whole lot of confidence in looking at full-run average TPM numbers to
discern whether transient dropoffs in TPM are significant or not.
        regards, tom lane