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
g...@2ndquadrant.com www.2ndQuadrant.us
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