SATAN in batch mode
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SATAN in batch mode

All SATAN functions are available interactively as well as in batch, so the user may separate his analysis work into an interactive part for development and debugging and a batch part for production runs.
Whereas interactive sessions are useful for testing and debugging on small subsets of data, batch execution is recommended for production runs processing large amounts of data and consuming large amounts of CPU time. The basic tool to support batch processing is the EXEC command which allows to collect all necessary commands into a single file and execute them without user intervention. EXEC files can also be used within standard input redirection.
Since session protocols represent re-usable command lists they might be used to re-run an interactive session in batch mode.
Given a user analysis program myanalysis and a command list mycommands.exec the UNIX shell command

nohup myanalysis <mycommands.exec 2>my.out >my.err &
will invoke the analysis in background, with stdout and stderr redirected to the files my.out and my.err in order to save all outputs. A session protocol is generated automatically.
Note that prompting for additional input is suppressed in batch mode, i.e. if stdin is not connected to a terminal. So all commands must provide all necessary inputs and the system does not ask for confirmation of potentially dangerous actions.
A command list for accumulating listmode data might look like:
inp / dsn(lmdv.first)
iwait / eof
inp / dsn(lmdv.second)
iwait / eof
...
adump * * / lib(sis9907) run(test)
exit 

Note the special command IWAIT, it is used to synchronize the I/O (analysis) thread with the command execution. After listmode analysis is completed all accumulated data elements are dumped into a data element library for later inspection.
| GSI | Biophysics | SATAN long write-up |

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Last updated: M.Kraemer@gsi.de, 3-Aug-1999