On Thu, 2007-07-05 at 21:50 +0100, Heikki Linnakangas wrote:
> All test runs were also patched to count the # of buffer allocations,
> and # of buffer flushes performed by bgwriter and backends. Here's those
> results (I hope the intendation gets through properly):
>
> imola-336 imola-337 imola-340
> writes by checkpoint 38302 30410 39529
> writes by bgwriter 350113 2205782 1418672
> writes by backends 1834333 265755 787633
> writes total 2222748 2501947 2245834
> allocations 2683170 2657896 2699974
These results may show that the minimum bgwriter_delay of 10ms may be
too large for the workloads: whatever the strategy used the bgwriter
spends too much time sleeping when it should be working.
-- Simon Riggs EnterpriseDB http://www.enterprisedb.com