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<h1>17.1 User Feedback Overview</h1>

<p><b></b> The 'Feedback'
facility allows a site to provide job performance information to users
at job completion time. When a job completes, the program pointed
to by the <a href="a.fparameters.php#feedbackprogram">FEEDBACKPROGRAM</a>
parameter is called with a number of command line arguments. The
site is responsible for creating a program capable of processing and acting
upon the contents of the command line. The command line arguments
passed are a follows
<p> - job name
<br> - user name
<br> - NONE
<br> - final job state
<br> - QOS requested
<br> - epoch time job was submitted
<br> - epoch time job started
<br> - epoch time job completed
<br> - job XFactor
<br> - job wallclock limit
<br> - processors requested
<br> - memory requested
<br> - average per task cpu load
<br> - maximum per task cpu load
<br> - average per task memory usage
<br> - maximum per task memory usage
<p> For many sites, the feedback script is useful as
a means of letting user's know that accuracy of their wallclock limit estimate,
as well as the cpu efficiency, and memory usage pattern of their
job. The feedback script may be used as a mechanism to do any of
the following:
<p> - email users regarding statistics
of all completed jobs
<br> - email users only when certain 
criteria are met (ie. "Dear John, you submitted job X requesting 128MB
of memory per task. It actually utilized 253 MB of memory per task
potentially wreaking havoc with the entire system! Please improve
your resource usage estimates in future jobs!")
<br> - update system databases
<br> - take system actions based on
job completion statistics
<br>
<p> NOTE: some of these fields may be set to zero
if the underlying OS/Resource Manager does not support the necessary data
collection.

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