JPL is using Elasticsearch in many areas of its business and currently have two main areas they would like to show. One application is flight telemetry and system dashboards from Curiosity and SMAP. The application takes production data and gives an easy way for engineers to monitor and measure instruments given back from our spacecraft. The other application is one that affects all employees at JPL as Elasticsearch now powers JPL’s internal search engine including a powerful video and people search.
Month: September 2015
YSlow’s Performance Analysis
YSlow, is an extension to Firebug, is available within Firefox. It generates a score for each rule and an overall score based on a weighted average of the individual rule scores. It also displays a list of all the resources used in the page as well as overall statistics (number of requests, total page weight, etc.).
The basic rules of YSlow’s Performance Analysis
- Minimize HTTP Requests
- Use a Content Delivery Network
- Avoid empty src or href
- Add an Expires or a Cache-Control Header
- Gzip Components
- Put StyleSheets at the Top
- Put Scripts at the Bottom
- Avoid CSS Expressions
- Make JavaScript and CSS External
- Reduce DNS Lookups
- Minify JavaScript and CSS
- Avoid Redirects
- Remove Duplicate Scripts
- Configure ETags
- Make AJAX Cacheable
- Use GET for AJAX Requests
- Reduce the Number of DOM Elements
- No 404s
- Reduce Cookie Size
- Use Cookie-Free Domains for Components
- Avoid Filters
- Do Not Scale Images in HTML
- Make favicon.ico Small and Cacheable
Efficient User 