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FIGURE 16.9
A VMD script in XML format.
conducted to measure the cost of migration of a DVM over a wide-area
network and compare the results with that of the existing suspension/
resume method and shared global storage approach. In our method, we
establish a model for a DVM, reconstruct a DVM skeleton according to
the model, and then migrate the user task, where the underlying VM is
i rst migrated via a DVM skeleton and incarnation. The migration per-
formance test is performed on a Dell Dimension 3000 with 1 P4 2.8 GB
CPU, 1 MB cache, 1 GB memory, and 160 G hard disk, and a Dell Precision
WorkStation 360 with 1 P4 2.6 GB CPU, 512 K, 1 G memory, and 80 G
hard disk. The effective communication capacity between the two nodes
is 83.2 Mbps. Xen is used as the virtualization platform. We have tested
four migration-enabled applications: the linpack sequential program
that solves a dense system of linear equations with Gaussian elimina-
tion; the bitonic program, which builds a random binary tree and then
sorts it; the test_tree program, which creates binary trees, assigns each
node a random weight, sorts them, and then sums the weights; the gzip
program, which compresses or decompresses i les. We use the linpack as
the representative of computational intensive applications, the bitonic
and the test_tree as the representatives of memory intensive applications,
and the gzip as the representative of I/O intensive applications. The VM
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