No, I think you have to consider the caches..
And some write takes longer than read, depending on the cache behaviour,
or whether there's cache hit or not.
Kenny
-----Original Message-----
From: Jeff Ridgway
To: [EMAIL PROTECTED]
Sent: 5/8/00 8:34 PM
Subject: [rtl] memory access time: how to fold into timing computations?
Hello RTLinux community,
I am sure that many of you have computed the amount of time necessary
to accomplish various tasks in real-time operations.
I am trying to factor in memory access. I have from a personal
conversation that the typical memory bus runs at 100 MHz. Thus
I am assuming that one can access a32-bit word in 10 nano-second (i.e.
access time about 1 byte per 2.5 nano-second). Thus, to read/write
from/to an array of 1MB in RAM should take 2.5 milli-seconds.
Does this figure stack up with your experience or am I way off of the
mark?
Cheers,
Jeff Ridgway
_________________
Jeffrey Ridgway, PhD
Information Systems Laboratories
7047 Carroll Road
San Diego, CA 92121
858.535.9680
[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
http://www.islinc.com <http://www.islinc.com>
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