MADAMA: Enhanced Accessibility (2)
Mobile Agent-based Distributed Architecture for Multimedia Applications
Performance Evaluations about MADAMA Dynamic Installation
The installation
of the full client via mobile agents has different costs depending on several
factors, from network distance and available bandwidth between the client and
the code server, to the overhead imposed by the security checks during the installation
via the mobile agent.
We have measured the time required to install the proprietary client (85kB)
on a 300-MHz PentiumII PC while the code server is a 120-MHz Sun SPARCstation5,
with the two machines located in two different LANs.
In case of
trusted environment, i.e. the user fully trusts the installation
agent and does not require any security check, the average required time is
3855 msec.
In case of untrusted environment, the installing agent is first
authenticated, its code integrity is verified, and its access to the client
host disk space is controlled on the basis of the local security policy. With
all these checks, and using SHA/RSA with a 1024-bit key, the average
required time goes up to 4492 msec (3912 msec if
the Java Just-In-Time compiler
is active on the receiving host).
For other performance
evaluations about the use of SOMA agents in Multimedia Distribution
Applications,
see the related SOMA Multimedia page.
If you are interested, instead, in QoS Adaptation Support in MADAMA, click here.
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