This manual is an introduction to Legion 1.8. It gives instructions for logging in to an active Legion system and a high-level introduction to Legion context space. Users who need to install or start a Legion system should consult the System Administrator Manual. If you need more help please contact us (page 109).
There are also man pages for all Legion commands included with the system files. To view a man page, type the following on the command line:
There are on-line tutorials on the Legion web site (http://legion.virginia.edu).
This manual assumes that you are working on a previously installed, compiled, and running system.1 Before going any further, be sure that the system is properly installed and running. Check with your system administrator if you are unsure.
Developed at the University of Virginia, Legion is a grid operating system. While fully supporting existing codes written in MPI and PVM, Legion provides features and services that allow users to take advantage of much larger, more complex resource pools. A user can easily run a computation on a supercomputer at a national center while dynamically visualizing the results on a local machine, or schedule and run a large parameter space study on several workstation farms simultaneously. For example, computational scientists can use cycles wherever they are, allowing bigger jobs to run in shorter times through higher degrees of parallelization.
These features also make Legion attractive to administrators looking for ways to increase and simplify the use of shared high-performance machines. The Legion implementation emphasizes extensibility, and multiple policies for resource use can be embedded in a single Legion system that spans multiple resources or even administrative domains.
1. It is actually not always necessary to have a Legion system running in order to use Legion: some Legion hosts can run as client hosts in a larger Legion system. A client host does not have the full set of Legion system binaries, but a set of binary executable files that can contact other Legion hosts in its Legion system. Please e-mail us at <firstname.lastname@example.org> for more information.
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