Overview

by Gustaaf Van Moorsel last modified Mar 27, 2014 by James Robnett

Overview

This document describes acceptable use of NRAO computing facilities for the purpose of calibration and imaging EVLA and VLBA observations at the New Mexico Array Science Center (NMASC).  The document describes the process of requesting an account, requesting resources and accessing data. In addition it enumerates available NRAO hardware and software and limits on the volume and duration of resources requests.

Users of NRAO computing resources must abide by the Acceptable Use Policy. Sharing of assigned user accounts is not permitted.

Resource request types and prioritization

The NMASC has finite computing resources, in the event of over subscription resources will be granted in the following priority order:

1.    Archive requests for data retrieval.
2.    Pipeline reprocessing requests to re-run NRAO supplied EVLA and ALMA pipelines with modified parameters
3.    Batch (script) submission to execute a user defined pipeline.
4.    Interactive use for direct CASA or AIPS interaction.

In the event that all resources are in use new tier 1 jobs will move to the top of the queue, then tier 2, then 3 and finally tier 4.  NRAO expects roughly 50% of the compute resources to be available for tier 4 interactive use. The distribution of job type is expected to change as more observers adopt pipeline reprocessing and batch processing modes.  

Over time the NRAO will examine finer grained prioritization, particularly within the batch and interactive queues, based on science rank, data size, time since observation or other parameters.