Parallel I/O

• Currently the I/O facilities (disk elements and Xodus elements) are tightly synchronized with the simulation (no lookahead). Therefore sending messages to Xodus objects or disk objects on remote nodes usually slows the simulation to a crawl. Use Xodus only for post-processing.
• Try to arrange input and output to be via local elements. On workstations it is preferable to access local disk. If access is via a shared file system (e.g., NFS, AFS), use different output disk files for different nodes, and amalgamate the data after the simulation is over.

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