You are here: Appendices > Appendix O: Integrating Other Resources with Moab > Compute Resource Managers > Event Driven Loadleveler Interface
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Event Driven Loadleveler Interface |
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Creating an event-driven interface for Loadleveler requires two steps.
The Loadleveler submit filter functions by taking a user's job command file as STDIN and sending the command file Loadleveler should process to STDOUT. If the submit filter is successful, it should exit with a status of 0. A simple sample script is provided below:
----------- #!/bin/perl -w while () { $line = $_; print STDOUT $line; } # Call wakeup script to moab scheduler system("/usr/local/sbin/wakeup > /dev/null"); exit(0); ------------
To enable use of this script you must set SUBMITFILTER parameter in the LoadL_config file.
The moab command mschedctl is not normally available to general end users. The wrapper allows users to issue a command to request that scheduling resume to process a newly-submitted job.
A sample wakeup.c wrapper file is included below:
----- #include #include #define MOABADMIN "loadl" #define SCHEDCTLCMD /usr/local/bin/mschedctl int main() { struct passwd *buf; if ((buf = getpwnam(MOABADMIN)) == NULL) exit(1); setuid(buf->pw_uid); system("SCHEDCTLCMD -r 1"); exit(0); } -----
To enable the wrapper, use the following steps:
Now submit a job. If all works correctly, Moab should detect and, if resources are available, start the job within one second.
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