Data Monitoring Procedures

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Revision as of 16:45, 1 December 2014 by Kmoriya (Talk | contribs) (Details of Offline Monitoring)

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Saving Online Monitoring Data

The procedure for writing the data out is given in, e.g., Raid-to-Silo Transfer Strategy.

Once the DAQ writes out the data to the raid disk, cron jobs will copy the file to tape, and within ~20 min., we will have access to the file on tape at /mss/halld/$RUN_PERIOD/rawdata/RunXXXXXX.

All online monitoring plugins will be run as data is taken. They will be accessible within the counting house via RootSpy, and for each run and file, a ROOT file containing the histograms will be saved within a subdirectory for each run.

For immediate access to these files, the raid disk files may be accessed directly from the counting house, or the tape files will be available within ~20 min. of the file being written out.

Running Over Archived Data

Once the files are written to take we can run the online plugins on these files to confirm what we were seeing in the online monitoring. Manual scripts, and eventually cron jobs can be set up to look for new run numbers and run the plugin over a sample of files.

Details of Offline Monitoring

Below are the procedures to

  • run a single offline plugin job manually
  • run a cron job to automate the process for new files

In principle these scripts should work, but if there are changes in the directory structure for the rawdata files, or if there is a significant increase in the memory or disk space necessary for the jobs, these should be modified.

Generating an offline plugin job

Within /home/gluex/halld/monitoring/batch/ there will be scripts to run the online monitoring plugins over tape files. The main script is, which can be used as XXX

where XXX is the run #.

This will generate a script, where the run # has now been formatted to be 6 digits. Executing this script will send the monitoring plugins job to the Auger batch system.

There is also a script which can be used as XXX

This will clean up all associated files created in association with run XXX.

Internally, the xml file used to submit the job will be created, and the job to run will be given within All run parameters should be specified in at the beginning of Since we are running on tape, the tape file will first be copied over to the cache disk, and the job will run over this cached file.

Using cron to run automatically

Within /home/gluex/halld/monitoring/cron/ there is a file cron_plugins that can be executed via

crontab cron_plugins

This will set up a cron job to call the script, which will check in the rawdata directory and call for any run that is more than 5 min old. The cron job is set up to run every 10 min.

Magnetic Field Settings

For tracking, it is necessary to set the correct magnetic field settings. The actual field settings for each run have not been documented well. Below are values based on going through entries in the halld log.

Run #s Solenoid Current (A) JANA option notes
940 - 1128 1000 -PBFIELD_MAP=Magnets/Solenoid/solenoid_1000A_poisson_20141104
1129 - 1448 0 -PBFIELD_TYPE=NoField Solenoid started ramping up around run 1431. Runs 1432 - 1448 should not be used for tracking. See this and this entry.
1449 - 1620 1200 -PBFIELD_MAP=Magnets/Solenoid/solenoid_1200A_poisson_20140520

Procedures of Running Offline Monitoring

This section is mostly just for documentation and is intended for the person who will run the jobs periodically (currently Kei). Currently we are thinking of running the jobs every Friday at the end of the day. This allows everybody to see improvements in each detector over the week.

  1. Acquire build lock for user gluex. This means sending out an email to Paul, Sean, Mark I, Kei to not make change in svn directories for user gluex, or to try to build anything until the jobs are finished.
  2. svn update & rebuild HDDS
  3. svn update & rebuild sim-recon
  4. svn update & rebuild monitoring hists
  5. Prepare the latest sqlite file & update the JANA_CALIB_URL environment variable with

cp /group/halld/www/halldweb1/html/dist/ccdb.sqlite /group/halld/www/halldweb1/html/dist/ccdb_2014-MM-DD.sqlite

  1. Submit jobs
  2. When jobs finish, unlock. This means sending another email to Paul, Sean, Mark I, Kei.
  3. Contact Sean to notify that there are new runs available in /volatile for copying over to the /work disk.

Extracting Summary Data

For high-level monitoring, we save images of selected histograms and store time series of selected quantities in a database, which are then displayed on a web page. This section describes how to generate the monitoring images and database information.

The scripts used to generate this summary data are currently kept in /u/home/gluex/halld/monitoring/process Note that these scripts currently have some parameters which must be periodically set by hand.

The default python version on most JLab machine does not have the modules to allow these scripts to connect to the MySQL database. To run these scripts, load the environment with the following command

source /u/home/gluex/halld/monitoring/process/

Online Monitoring

There are two scripts for running over the monitoring data generated by the online system and offline reconstruction. The online script is run with either of the following commands:


The shell script sets up the environment properly to run the python script. To connect to the monitoring database on the JLab CUE, modules continued in the installation of python >= 2.7 are needed. The shell script is appropriate to use in a cron job.

The online monitoring system copies a ROOT file containing the results of the online monitoring, and other configuration files into a directory accessible outside the counting house. This python script automatically checks for new ROOT files, which it will then automatically process. It contains several configuration variables that must be correctly set, which contains the location of input/output directories, etc...

Offline Monitoring

The processing of offline monitoring data should be run after a new reconstruction pass is done. The data is processed using the following script:

./ <input directory> <output directory>
./ 2014-11-14 /volatile/halld/RunPeriod-2014-10/offline_monitoring/ /w/halld-scifs1a/data_monitoring/RunPeriod-2014-10/ver02

Every time a new reconstruction pass is performed, a new version number must be generated. To do this, prepare a version file as described below. Then run the script to store the information in the database. The script will return a version number, which then should be set by hand in - future versions of the script will streamline this part of the procedure. An example of how to generate a new version is:

./ add /u/home/gluex/halld/monitoring/process/versions/vers_RunPeriod-2014-10_pass1.txt

Data Versions

To document the conditions of the monitoring data that is created, for the sake of reproducability and further analysis we save several pieces of information. The format is intended to be comprehensive enough to document not just monitoring data, but versions of raw and reconstructed data, so that this database table can be used for the event database as well.

We store one record per pass through one run period, with the following structure:

Field Description
data_type The level of data we are processing. For the purposes of monitoring, "rawdata" is the online monitoring, "recon" is the offline monitoring
run_period The run period of the data
revision An integer specifying which pass through the run period this data corresponds to
software_version The name of the XML file that specifies the different software versions used
jana_config The name of the text file that specifies which JANA options were passed to the reconstruction program
ccdb_context The value of JANA_CALIB_CONTEXT, which specifies the version of calibration constants that were used
production_time The data at which monitoring/reconstruction began
dataVersionString A convenient string for identifying this version of the data

An example file used as as input to ./ is:

data_type           = recon
run_period          = RunPeriod-2014-10
revision            = 1
software_version    = soft_comm_2014_11_06.xml
jana_config         = jana_rawdata_comm_2014_11_06.conf
ccdb_context        = calibtime=2014-11-10
production_time     = 2014-11-10
dataVersionString   = recon_RunPeriod-2014-10_20141110_ver01