What is a remote program?|
What kind of programs can Legion run?
Registering non-Legion-compatible programs
Registering Legion-compatible programs
Running a remote program
Starting and Shutting down Legion 1.0|
An introduction to context space
Legion host and vault objects
Quick list of all Legion commands
Usage of all Legion commands
Depending on how your system is set up, you may need to set up your access to your system before you can run Legion commands. This will probably involve running a command such as this:
$ . ~LEGION/setup.sh
$ source ~LEGION/setup.csh
legion_register_program <program class> <executable path> <legion arch>The <program class> parameter is a context path name for the class that will manage Legion objects related to a particular program. Note that since the user decides how to organize his or her own context space, the path name can be whatever the user finds most convenient (although you might want to use the name of the program in the <program class> parameter, so that it will be easier to remember). The context path name can be new or can use a previously created path (if the user is registering multiple versions of a the same program), and will refer to a (new or previously created) Legion object that functions as a proxy for executing a non-compatible remote program. Note also that if multiple programs are registered with the same program class and architecture, the most recently registered version will be used when the program is run on that particular architecture. Once the program has been registered, it can be run with the legion_run command.
An example of this command might look like this:
$ legion_register_program myProgram /bin/programs/myProgram linux Program class "myProgram" does not exist. Creating class "myProgram". Registering implementation for class "myProgram" $
$ legion_register_program myProgram /bin/programs/myProgram linux Registering implementation for class "myProgram" $
legion_register_runnable <program class> <executable path> <legion arch>As with legion_register_program, the <program class> parameter is a context path name for the Legion objects that will handle a particular program. And, again, the user is free to choose a context path that best suits his or her organizational scheme, or use a previously created context (although you might want to use the name of the program in the <program class> parameter, so that it will be easier to remember). In that case, note that Legion will use the most recently registered program class and architecture when running a remote program. Once the program has been registered, it can be run with the legion_run command.
$ legion_register_runnable myProgram /bin/programs/myProgram linux Program class "myProgram" does not exist. Creating class "myProgram". Registering implementation for class "myProgram" $
$ legion_register_runnable myProgram /bin/programs/myProgram linux Registering implementation for class "myProgram" $
Running a remote program
legion_run [-help] [-w] [a <architecture>] [-in <contex path name>] [-out <context path name>] [-IN <local file name>] [-OUT <local file name>] [-f <options file>] <program class> [<arg1>, <arg2>, ... <argn>]The legion_run command executes a single instance of the program associated with the <program class> parameter. Legion will randomly choose a host with a suitable architecture (specified when the program was registered) to execute the program.
There are several optional parameters associated with this command. The -help flag displays the command's syntax and provides a brief description of how to use its options. The -w flag directs Legion to direct the command's output to your tty object. Note that if you have not created or set a tty object for your current window, you will not be able to see the command's output and an error message will appear. You can use the legion_create_object command to create a tty object, and the legion_set_tty command to set the tty as an environmental variable:
$ legion_create_object -c class/ttyObjectClass mytty 1.01.67000000.01000000.000001fc0a6876... $ legion_set_tty mytty $ legion_tty_watch &
The -a flag allows you to specify the type of platform the program requires. Note that the possible architectures are limited. At the moment they are:
|linux||corresponds to x86 running Red Hat 4.x Linux|
|solaris||corresponds to Sun workstations running Solaris 5.x|
|sgi||corresponds to SGI workstations running IRIX 5.x|
|alpha_linux||corresponds to DEC Alphas running Red Hat 4.x Linux|
|alpha_DEC||corresponds to DEC Alphas running OSF1 v4|
|t90||corresponds to Cray T90s running Unicos 10.x|
|rs6000||corresponds to IBM RS/6000s running AIX 4.2|
The other two options operate on a local file: -IN <local file name> tells Legion to copy the files named in <local file name> into the the remote program's current working directory before the program executes, and -OUT <local file name> tells Legion to copy the program's output to the file named in <local file name>.
Files that are listed with the -in/-out and -IN/-OUT options can be named with either full or relative path names. Note, however, that the remote program will use the file path's basename (i.e., as relative path names from the current working directory) to gain access to the named file. New files will be given names corresponding to the basename of the current Legion context path or local directory path. The <arg1>, <arg2>, ... <argn> parameters are arbitrary command-line arguments.
If your program requires extensive use of these options you may want to use the -f flag, which allows user to list the options in a separate file rather than on the command line. The file can contain any of the options discussed above (except <program class> parameter or the [<arg1>, <arg2>>, ... <argn>] and can be delimited with spaces or new lines.
$ legion_register_program cp /bin/cp linux Program class "cp" does not exist. Creating class "cp". Registering implementation for class "cp" $ legion_run -in /dir1/src -out /dir2/dest cp src dest $
The program is then remotely executed on a randomly chosen linux host, and a series of events takes place: first, the -in option tells Legion to copy the Legion file /dir1/src into the remote program's cp's current working directory and call it src. The remote program cp then executes, copying src to a new Unix file, dest. Finally, once cp has terminated, Legion copies the contents of Unix file dest to a new Legion file called dest, and adds the context name dest to /dir2 (i.e., if the user runs legion_context_list /dir2, dest will now be listed and will refer to the dest file).
Note that you can ask for multiple input and output files when you execute a program by repeating the -in/-out and -IN/-OUT options.