Re: Program performance using File Status Data Structure

[bmorris@xxxxxxxxxx]

>Date: Fri, 6 Oct 2000 13:13:57 -0500
>From: pytel@us.ibm.com
>
>Requesting feedback on database operations may inhibit blocking.
>If you open file for update or for random access, it's not an issue, but
>for sequential processing it could be a big hit.

Alexei, coding an INFDS does not inhibit blocking.  The INFDS is updated
only after each block is read or written.  In fact, explicitly requesting
feedback (POST operation) can improve performance somewhat, since a POST
operation will cause the feedback areas in the INFDS to be updated only
on a POST, not after each I/O.

Barbara Morris


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