Yeb Havinga wrote:
Small IO size: 4 KB Maximum Small IOPS=86883 @ Small=8 and Large=0 Small IO size: 8 KB Maximum Small IOPS=48798 @ Small=11 and Large=0
Conclusion: you can write 4KB blocks almost twice as fast as 8KB ones. This is a useful observation about the effectiveness of the write cache on the unit, but not really a surprise. On ideal hardware performance should double if you halve the write size. I already wagered the difference in pgbench results is caused by the same math.
-- Greg Smith 2ndQuadrant US Baltimore, MD PostgreSQL Training, Services and Support greg@xxxxxxxxxxxxxxx www.2ndQuadrant.us -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
