MATLAB DISTRIBUTED COMPUTING SERVER 4 - SYSTEM ADMINISTRATORS GUIDE User Manual download pdf (Page 34)

2 Network Administration

Have your MATL AB administrator ve rify that the license manager

is running and validate network services.

For more infor mation, see The MathWorks Suppo rt page at

http://www.mathworks.com/support and search f or

"license manage r error -15"

- If yo u have installed only Distributed Computing Toolbox, and you are

attempting to run a worker on the s ame machine, you will receive this

error because the Distributed Co mputing Eng ine i s not installed, and

therefore the worker cannot obtain a license.

Verifying Multicast Com m unications

Note Though DCT/MDCE Version 3 continues to support multicast

communications between its processes, multicast is not recommended and

might not be supported in future releases.

Multicast, unlike TCP/IP or UDP, is a subscription-based protocol where a

number of machines on a network indicate to the network their interest in

particular packets originating somewhere o n that network. By contrast,

both UDP and TCP packets are always bound for a single machine, usually

indicated by its IP address.

The main tools for investigating this type of packet are

tcpdump or the

equivalent on Windows (usually called

winpcap and ethereal), and a Java

class included with DCT/MDCE Version 3.0.

The class is called

com.mathworks.toolbox.distcomp.test.MulticastTe ster .Bothitsstatic

main method and its constructor take two input arguments: the multicast

group to join and the po rt number to use.

This Java class has a number of simple methods to attempt to join a specified

multicast group. Once the class has successfully joined the group, it has

methods to send m essages to the group, listen for messages from the group,

and display what it receives. The class can be used both inside MATLAB

and from a call to Java.

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