seeingLogger - NAOMI Seeing Logging Utility
seeingLogger [-h] [-d dirname] [-DataServer <host>] [-v] [-i
seeingLogger is a daemon program that is used to create see-
ing trace files based on seeing information extracted from
the NAOMI process monitor. The each line detailed in the
trace file consists of a timestamp and an estimation of the
corrected and uncorrected seeing.
The seeingLogger will continually update the file at inter-
vals specified by the user on the command line or at the
default interval of 5 seconds.
A new seeing trace file will be created at midday everyday.
The command line options that the program accepts are
-h Print usage information about the application.
Specify the name of the directory within which the
trace files will be written. By default, the trace
files are written to the directory /wht/var/seeingLogs.
-v Display the version number of the application.
-DataServer <host name>
This is the name of the machine which hosts the EPM
data server. The EPM data server is the WHT OCS's
interface to the NAOMI system and needs to be running
in order for the application to retrieve seeing trace
information from the AO system.
Instruct the seeing logger to create a saw tooth wave
in the plot file rather than taking the data from the
NAOMI EPM. This is for test purposes.
Specifies the interval in seconds between taking sam-
ples of the seeing estimates and writing them into the
file. The default interval is five seconds.
The trace files will be written into the directory specified
on the command line using the -d option. By default, the
files will be written into the directory
The files will adopt the following naming convention.
Where YYYY is the current year, MM is the current month and
DD is the current day.
The trace files will take the following format :
#Trace Seeing Log Format 1.0
963831603 0.204990 0.882917
963831608 0.214990 0.822917
The first line of the file is a marker so that any utility
that uses the file can identify the file as a seeing trace
file and can establish the version of the file format (given
at the end of the first line).
The second and subsequent lines will consist of the follow-
ing fields each separated by a TAB character.
Time of Sample
This is the Unix time expressed in seconds since 1st of
Corrected Seeing Estimate
This is the corrected seeing estimate expressed as a
real number and in arcsecs.
Uncorrected Seeing Estimate
This is the uncorrected seeing estimate expressed as a
real number and in arcsecs.
A new trace file will be created by the application at
The application respects the following environment variables
This is the name of the machine which is hosting the
EPM data server. This may be overridden by specifying
the name of the host machine when starting the applica-
tion using the -DataServer command line switch.
The following errors can be exhibited by the application :
Unable to create seeing trace log
If the application is unable to create the new seeing
file then it will abort. This will occur if the user
that has started the application does adequate permis-
sion to write to the directory within which the trace
files are to be written.
Communications error with EPM
If the application is unable to retrieve the seeing
data from the Electra process monitor it will report
the error but will be unable to update the seeing log.
The application will continually retry until it finally
resumes communication. If this error is reported, check
to see if the Electra process monitor is actually run-
Craige Bevil (email@example.com)
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