From: Tom Lane <tgl@sss.pgh.pa.us>
To: Greg Stark <gsstark@mit.edu>
Cc: Kevin Kempter <kevink@consistentstate.com>
Cc: pgsql-admin@postgresql.org
Subject: Re: Re: "effective_io_concurrency" cannot be changed error when starting 8.4.2 instance
Date: Mon, 08 Feb 2010 20:36:01 -0500
Message-ID: <4538.1265679361@sss.pgh.pa.us> (raw)
In-Reply-To: <407d949e1002081711h4b13e10cy4f571034813567c5@mail.gmail.com>
References: <201002081800.26118.kevink@consistentstate.com>
<407d949e1002081711h4b13e10cy4f571034813567c5@mail.gmail.com>
Greg Stark <gsstark@mit.edu> writes:
> The error means that your system does not support the system interface
> we need to support prefetching. In that case effective_io_concurrency
> will be a read-only parameter set to 0 and any attempt to set it will
> result in an error.
I wonder whether it would be better to have it still be a read-write
parameter, but with min/max values equal to zero. All the other cases
where we have read-only parameters, they're *always* read-only. It
seems a bit odd that this one is platform-specific not only as to the
allowed range but whether it can be assigned at all.
regards, tom lane
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To: pgsql-admin@postgresql.org
Cc: tgl@sss.pgh.pa.us, gsstark@mit.edu, kevink@consistentstate.com
Subject: Re: Re: "effective_io_concurrency" cannot be changed error when starting 8.4.2 instance
In-Reply-To: <4538.1265679361@sss.pgh.pa.us>
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