The LDM Product-Queue

LDM Product-Queue

The product-queue is a memory-mapped file that temporarily stores data-products. Access to the product-queue is via the pq module, which coordinates access by the reading and writing processes to ensure that the product-queue isn't corrupted.

The product-queue has the following characteristics:

The canonical pathname of the LDM product-queue, relative to the LDM home-directory, is var/data/ldm.pq

A paper on the implementation-details is

Rew, Russ and Anne Wilson, 2001: The Unidata LDM System: Recent Improvements for Scalability, Proceedings, 17th IIPS, American Meteorological Society, January, Albuquerque, New Mexico.