User`s guide

Testing the Installation
2-21
Displaying Status Information
The Real-Time Windows Target provides the command rtwho for accessing the
kernel and displaying status information. It lists information about the version
number, kernel performance, and history variables. Also, you can determine
whether or not the Real-Time Windows kernel is presently installed:
1 In the MATLAB window, type
rtwho
MATLAB displays messages similar to those shown below.
Real-Time Windows Target version 2.5.0 (C) The MathWorks, Inc.
1994-2003
MATLAB performance = 100.0%
Kernel timeslice period = 1 ms
DRIVERS: Name Address Parameters
Humusoft AD512 0x300 []
2 Interpret the message.
This message indicates that MATLAB and other non-real-time applications
(for example, a word processor) are able to run at 100% performance because
no real-time applications are currently executing on your PC.
When a real-time application is executing, the MATLAB performance is at
a value below 100%. For example, if the MATLAB performance = 90.0%,
then the real-time application is using 10% of the CPU time.
We recommend that you select a sample rate so that
rtwho returns a
MATLAB performance of at least 80%.
The kernel time slice period is the current frequency of the hardware timer
interrupt. One millisecond is the maximum value for models with large
sample times (slow sampling rate) or when an application has not been built.
This value changes when you select sampling times less than 1 millisecond.