From: Robert Dewar <robert_dewar@my-dejanews.com>
Subject: Re: delay until and GNAT - expand
Date: 1999/05/11
Date: 1999-05-11T00:00:00+00:00 [thread overview]
Message-ID: <7h830a$e4$1@nnrp1.deja.com> (raw)
In-Reply-To: rracine.14.0008C889@draper.com
In article <rracine.14.0008C889@draper.com>,
rracine@draper.com (Roger Racine) wrote:
> I just did a little checking on Wind Rivers' web site, and I
> found, for the "MV167C" Motorola 68K board (they do not
> specify which chip or speed in the web page), "context
> switching requires only 3.8 microseconds". Not exactly 1
> microsecond, but I got the order of magnitude correct.
I would say this shows you likely got the order of magnitude
one off. Implementation of a delay involves more than a simple
context switch. As I say, we will measure the WR VXW speed
on a fast machine and see what we get. I am willing to bet
you are way off in the one microsecond estimate. Yes, it would
be nice if it were only one microsecond, but I am afraid we will
not see it. Anyway, let's wait till we can get some data here.
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next prev parent reply other threads:[~1999-05-11 0:00 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-05-05 0:00 delay until and GNAT isaac buchwald
1999-05-05 0:00 ` David C. Hoos, Sr.
1999-05-05 0:00 ` dennison
1999-05-06 0:00 ` Buz Cory
1999-05-06 0:00 ` Robert Dewar
1999-05-06 0:00 ` delay until and GNAT - expand isaac buchwald
1999-05-07 0:00 ` Roger Racine
1999-05-08 0:00 ` dewar
1999-05-10 0:00 ` Context switching (was: delay until and GNAT) Nick Roberts
1999-05-11 0:00 ` Robert Dewar
1999-05-11 0:00 ` Tarjei Tj�stheim Jensen
1999-05-11 0:00 ` David Brown
1999-05-11 0:00 ` Robert Dewar
1999-05-11 0:00 ` Robert Dewar
1999-05-10 0:00 ` delay until and GNAT - expand Roger Racine
1999-05-10 0:00 ` Joel Sherrill
1999-05-11 0:00 ` isaac buchwald
1999-05-11 0:00 ` dennison
1999-05-12 0:00 ` Robert Dewar
1999-05-11 0:00 ` Robert Dewar
1999-05-11 0:00 ` dennison
1999-05-10 0:00 ` Roger Racine
1999-05-11 0:00 ` Robert Dewar [this message]
1999-05-11 0:00 ` dennison
1999-05-11 0:00 ` Robert Dewar
1999-05-12 0:00 ` delay until and GNAT - where to get the info isaac buchwald
1999-05-12 0:00 ` Robert Dewar
[not found] ` <rracine.14.00 <rracine.15.000968A0@draper.com>
1999-05-11 0:00 ` delay until and GNAT - expand Robert Dewar
1999-05-11 0:00 ` Roger Racine
1999-05-12 0:00 ` Roger Racine
[not found] ` <rracine.14.00 <rracine.17.0007DA28@draper.com>
1999-05-12 0:00 ` dennison
1999-05-06 0:00 ` delay until and GNAT Roger Racine
1999-05-10 0:00 ` Nick Roberts
1999-05-11 0:00 ` Context Switching Nick Roberts
1999-05-11 0:00 ` Robert Dewar
1999-05-11 0:00 ` Robert I. Eachus
1999-05-12 0:00 ` dennison
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