BUG #15396: initdb emits wrong comment for range for effective_io_concurrency

From: PG Bug reporting form <noreply(at)postgresql(dot)org>
To: pgsql-bugs(at)lists(dot)postgresql(dot)org
Cc: james(at)jlr-photo(dot)com
Subject: BUG #15396: initdb emits wrong comment for range for effective_io_concurrency
Date: 2018-09-23 16:06:04
Message-ID: 153771876450.14994.560017943128223619@wrigleys.postgresql.org
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The following bug has been logged on the website:

Bug reference: 15396
Logged by: James Robinson
Email address: james(at)jlr-photo(dot)com
PostgreSQL version: 11beta3
Operating system: OSX
Description:

inidb in 11 beta4 emits a postgresql.conf with the following:

...
# - Asynchronous Behavior -

#effective_io_concurrency = 0 # 1-1000; 0 disables prefetching
...

But un-commenting and changing to any value other than zero produces:

2018-09-23 15:57:15.960 GMT [33648] LOG: 1 is outside the valid range for
parameter "effective_io_concurrency" (0 .. 0)

Something up here? If not a tunable knob, why describe it and / or have the
misleading comment?

beta4 Installed via macports.

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