HP3000-L Archives

August 2001, Week 5

HP3000-L@RAVEN.UTC.EDU

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From:
Bruce Toback <[log in to unmask]>
Reply To:
Bruce Toback <[log in to unmask]>
Date:
Wed, 29 Aug 2001 13:46:36 -0700
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Stan Sieler writes:

>If I'm serially processing a large mapped object (e.g., a mapped file),
>if I could say "I'm through with the prior 5 megabytes of data", that
>means that if anyone happens to get a page fault, MPE will
>have an easy answer to the question it asks itself: "where should I put the
>incoming page".

It depends on what the definition of "I" is. If a program can be
guaranteed to be the only process accessing the file, then "I'm through"
makes sense. If the program using this proposed API is not accessing the
file exclusively, then asking MPE to release the file's pages will slow
down overall performance, not speed it up.

-- Bruce


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