4.1. The Standard Output

The Standard Output (or stdout) is a running log of things an ARMI run prints out as it executes a case. It shows what happened during a run, which inputs were used, which warnings were issued, and in some cases, what the summary results are. Here is an excerpt:

===========  Completed BOL Event ===========

===========  Triggering BOC - cycle 0 Event ===========
=========== 01 - main                           BOC - cycle 0   ===========
[impt] Beginning of Cycle 0
=========== 02 - fissionProducts                BOC - cycle 0   ===========
=========== 03 - xsGroups                       BOC - cycle 0   ===========
[xtra] Generating representative blocks for XS
[xtra] Cross section group manager summary

In a standard run, the various interfaces will loop through and print out messages according to the verbosity setting. In multi-processing runs, the stdout shows messages from the master node first and then shows information from all other nodes below (with verbosity set by the branchVerbosity setting).

If there is an error, a useful message may be printed in the stdout, and a full traceback will be provided in the associated stderr file.

Some users tend to use the tail command to monitor the progress of an ARMI run:

tail -f myRun.stdout

This provides live information on the progress.