From: jsa@alexandria.organon.com (Jon S Anthony)
Subject: Re: Tasking Techniques - Opinions?
Date: 1997/06/10
Date: 1997-06-10T00:00:00+00:00 [thread overview]
Message-ID: <JSA.97Jun10131945@alexandria.organon.com> (raw)
In-Reply-To: dewar.865692193@merv
In article <dewar.865692193@merv> dewar@merv.cs.nyu.edu (Robert Dewar) writes:
> Jon says
>
> <<> Absolutely true. However, do be aware that protected types have
> > significant overhead -- not as much as task rendezvous, but on the
> > order of ten times a procedure call.
>
> I find this surprising. On what do you base this 10X figure?
> >>
>
> surprisingly low? or suprisingly high? The difference will vary widely. If
Actually, I was thinking "high".
> taking the necessary lock requires a kernel call, as it does when running
> over some OS's, then the factor of 10 will be wildly optimistic. Protected
> types were designed to be efficient on bare hardware, their implementation
> over operating stystems is often disappointingly inefficient.
OK, that makes good sense.
/Jon
--
Jon Anthony
Organon Motives, Inc.
Belmont, MA 02178
617.484.3383
jsa@organon.com
next prev parent reply other threads:[~1997-06-10 0:00 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
1997-06-04 0:00 Tasking Techniques - Opinions? Steve Doiel
1997-06-03 0:00 ` Tom Moran
1997-06-07 0:00 ` Steve Doiel
1997-06-04 0:00 ` bsanden
1997-06-04 0:00 ` Samuel A. Mize
1997-06-05 0:00 ` Jon S Anthony
1997-06-06 0:00 ` Samuel A. Mize
1997-06-07 0:00 ` Robert Dewar
1997-06-10 0:00 ` Jon S Anthony [this message]
1997-06-04 0:00 ` Jon S Anthony
1997-06-05 0:00 ` Robert A Duff
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