On 18.07.2012 02:48, Peter Geoghegan wrote:
On 17 July 2012 23:56, Tom Lane<t...@sss.pgh.pa.us> wrote:
This implies that nobody has done pull-the-plug testing on either HEAD
or 9.2 since the checkpointer split went in (2011-11-01), because even
a modicum of such testing would surely have shown that we're failing to
fsync a significant fraction of our write traffic.
Furthermore, I would say that any performance testing done since then,
if it wasn't looking at purely read-only scenarios, isn't worth the
electrons it's written on. In particular, any performance gain that
anybody might have attributed to the checkpointer splitup is very
This is not giving me a warm feeling about our testing practices.
The checkpointer slit-up was not justified as a performance
optimisation so much as a re-factoring effort that might have some
concomitant performance benefits.
Agreed, but it means that we need to re-run the tests that were done to
make sure the extra fsync-request traffic is not causing a performance
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