Waiting for 9.6 – Allow per-tablespace effective_io_concurrency

On 8th of September, Alvaro Herrera committed patch:

Allow per-tablespace effective_io_concurrency
 
Per discussion, nowadays it is possible to have tablespaces that have
wildly different I/O characteristics from others.  Setting different
effective_io_concurrency parameters for those has been measured to
improve performance.
 
Author: Julien Rouhaud
Reviewed by: Andres Freund

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