# Presentation: 199623

## Intersite CoordinationPerformance

- Mark Mathewson

## Overview

- How does ISC work?
- ISC Processing Consumes Significant Resources
- What can be done by you to help?
- forecasters control the resources

- ISC Performance

- January 15, 2003

## How ISC Works

- Sending ISC Grids is triggered by the forecaster in a variety of ways.
- Grids are sent over the WAN to your neighbors.
- Grids are mosaic’d with other WFO ISC grids and stored in the ISC database.

- ISC Performance

- January 15, 2003

## ISC Internals

**ISC Internals**

- ISC Performance

- January 15, 2003

## Spatial Mosaic

**Spatial Mosaic**

- ISC Performance

- January 15, 2003

## Temporal Mosaic

**Temporal Mosaic**

- ISC Performance

- January 15, 2003

## Performance Characteristics

- Number of Grids
- Hourly grids, vs. longer grids
- Number of weather elements
- Number of Gridpoints per Grid
- 5km resolution – typically 25k points
- 2.5 km resolution – typically 100k points
- AWIPS H/W, S/W sized for 25k points

- ISC Performance

- January 15, 2003

## Performance Characteristics

- Three Processing Steps:
- Creation of netCDF file for transmission
- MHS Sending over WAN
- Receive processing of netCDF file, remapping projection, and mosaic operations.
- Full set of grids – 100 million gridpoints, handled multiple times. Can cause delays of 20 minutes.

- ISC Performance

- January 15, 2003

## NDFD and ISC

- Related – but not the same.

- WFO

- WFO

- WFO

- Fcst

- Fcst

- Fcst

- Official

- Official

- Official

- ISC Performance

- January 15, 2003

## ISC Sending Options

- ISC Performance

- January 15, 2003

## Send Options give you control

- Sending fewer grids = Better performance
- Multiple places on GFE to send grids
- Choices of:
- Which sites
- Which weather elements
- Which time periods

- ISC Performance

- January 15, 2003

## Send ISC Dialog

- Select which weather elements
- Select time period  -- allows single grid
- Select which sites to transmit your grids to
- PRESET set of Weather Elements available

- ISC Performance

- January 15, 2003

## Publish Dialog

- Can select weather element, time period, choose to send ISC or not
- Always all sites

- ISC Performance

- January 15, 2003

## Save Weather Element Dialog

- Sends to all sites
- Sends just the grids that are to be saved

- ISC Performance

- January 15, 2003

## Sending Single Grids

- MB3 “Send ISC Grid” over a grid in the Grid Manager.
- Sends to all sites
- Good for coordinating single grids.

- ISC Performance

- January 15, 2003

## sendISC

- sendISC program can be used to send ISC grids. Can define:
- Time range over which grids are sent
- Weather Elements
- Sites, including sites that are NOT defined in ISC_Sites.
- Official database or Fcst database

- ISC Performance

- January 15, 2003

## Too many options????

- Options have been added per field request.
- Options used together can cause duplicate grids to be sent and received.
- Forecast Methodology important in determining the right method to use.

- ISC Performance

- January 15, 2003

## Sending Guidelines

- Don’t simply send all of your grids all the time. For example,
- Send when save
- Send Intersite Coordination Grids dialog
- Publish dialog
- Triplicate grid sends don’t help performance.

- ISC Performance

- January 15, 2003

## Sending Guidelines

- Send grids as you do your work – basically a few at a time.
- Sending when Save is a good idea
- Configure your system to:
- Preset the dialogs to only include certain times or elements

- ISC Performance

- January 15, 2003

## Sending Guidelines

- Send single grids to single site when working out a coordination issue
- Quick delivery/processing of grid - < 1 minute

- ISC Performance

- January 15, 2003

## Summary

- Performance is a big issue.
- H/W solutions
- Forecaster methodology
- S/W performance improvements
- S/W Changes

- ISC Performance

- January 15, 2003