MATLAB DISTRIBUTED COMPUTING SERVER 4 - SYSTEM ADMINISTRATORS GUIDE User Manual Page 21

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  • TROUBLESHOOTING
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Troubleshooting
- If you installed only the Parallel Computing Toolbox product, and you
are attempting to run a worker on the same machine, you will receive
this error because the MATLAB Distributed Computing Server product
is not installed, and therefore the worker cannot obtain a license.
Verifying Multicast Communications
Note Although Version 4 of the parallel computing products 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 on 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 for UNIX operating systems
winpcap and ethereal for Microsoft Windows operating systems
A Java™ class included with Version 3 of the parallel computing products.
The Java class is called
com.mathworks.toolbox.distcomp.test.MulticastTester. Both its static
main method and its constructor take two input arguments: the multicast
group to join and the port number to use.
This Java class has a number of simple methods to attempt to join a speciÞed
multicast group. Once the class has successfully joined the group, it has
methods to send messages 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 software.
Inside MATLAB, use the class as follows:
m = com.mathworks.toolbox.distcomp.test.MulticastTester('239.1.1.1', 9999);
m.startSendingThread;
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