Appendix G: Prologue and Epilogue Scripts

TORQUE provides administrators the ability to run scripts before and/or after each job executes. With such a script, a site can prepare systems, perform node health checks, prepend and append text to output and error log files, cleanup systems, and so forth.

The following table shows which MOM runs which script. All scripts must be in the TORQUE_HOME/mom_priv/ directory and be available on every compute node. The "Mother Superior" is the pbs_mom on the first node allocated for a job. While it is technically a sister node, it is not a "Sister" for the purposes of the following table.

Script	Execution location	Execute as	File permissions
prologue	Mother Superior	root	Readable and executable by root and NOT writable by anyone but root (e.g., -r-x-----)
epilogue		root
prologue.user		user	Readable and executable by root and other (e.g., -r-x---r-x)
epilogue.user		user
prologue.parallel	Sister	root	Readable and executable by root and NOT writable by anyone but root (e.g., -r-x-----)
epilogue.parallel		root
prologue.user.parallel		user	Readable and executable by root and other (e.g., -r-x---r-x)
epilogue.user.parallel		user
epilogue.precancel	Mother Superior This script runs after a job cancel request is received from pbs_server and before a kill signal is sent to the job process.	user	Readable and executable by root and other (e.g., -r-x---r-x)

This section contains these topics:

• Script Order of Execution
• Script Environment
• Per Job Prologue and Epilogue Scripts
• Prologue and Epilogue Scripts Time Out
• Prologue Error Processing

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