LDM Status
for Users Committee, November 2000
Russ Rew
After beta testing of LDM updates by various users, version 5.1.2 was
released on August 31, 2000. The release
announcement noted recent improvements for scalability, including
improvements to the product queue algorithms and removal of product
queue size limitations on 64-bit platforms.
Here are some benchmark results using real products for a typical
hour from all current feeds comparing LDM 5.0 and LDM 5.1 average
rates in products/second for sending an hour's worth of data (1.1
Gbytes in 81,000 products) from one host to another, using various
product queue capacities on the destination host:
| Products in destination queue |
Products/sec, LDM 5.0 |
Products/sec, LDM 5.1 |
| 20000 | 130 | 300 |
| 40000 | 66 | 243 |
| 80000 | 40 | 230 |
| 160000 | 20 | 210 |
Although the LDM still has a limited number of feedtypes (31), the
new release reorganizes and provides names for all available feedtypes
in preparation for a transition from FOS feedtypes to use of NOAAport
feedtypes.
Anne Wilson wrote
On the Use of Internet News for Delivering Data,
and gave two full LDM Workshops (16 participants in each)
at the UPC on 26-28 October and 5-7 November. Dave Fulker will be
presenting a
paper on the IDD and LDM to the CBS Technical Conference on WMO
Information Systems and Services on 27-28 November 2000. Russ Rew
will present a paper on
recent LDM improvements at the AMS/IIPS meeting in January 2001.
This document is maintained by
Russ Rew <russ@unidata.ucar.edu>
This page was updated on
.
