The Network Performance Advisor J. W. Ferguson NLANR/DAST & NCSA.
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Transcript of The Network Performance Advisor J. W. Ferguson NLANR/DAST & NCSA.
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The Network Performance Advisor
J. W. Ferguson
NLANR/DAST & NCSA
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Acknowledgements
• NLANR/DAST does its work on ‘The Advisor’ under a cooperative agreement with the National Science Foundation
• The Internet2 E2E Initiative and the piPEs project have provided support and encouragement throughout
• The Network Measurement Working Group of the Global Grid Forum, for the schema work being done to allow data sharing between measurement projects
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Advisor OverviewTargeted for end users & network engineers, the Advisor
measures, displays, and analyzes network metrics
• Uses existing diagnostic tools by integrating them into a common framework
• For network engineers & administrators, provides an easy to use interface to view network metrics, and customize which metrics you like to monitor
• For end users, Advisor attempts to emulate a junior-level network engineer with its Analysis Engine
• Uses the schema in development by the GGF’s Network Measurement Working Group.
• Additional tools and analyses can be added easily
http://dast.nlanr.net/projects/advisor
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Current Status
• Version 1.2 released November 2004.• Code freeze for Version 2.0 on 28 February.
Release will follow within a week.• ‘Bundles’ included in release will include Iperf,
OWAMP, ping, top, pathchar, ifconfig, traceroute, netstat, and pathload
• All code is accessable via anonymous CVS.
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ArchitecturePerformance Data Collector (PDC)
• Gathers network performance data
Performance Data Historical Archiver (PDHA)
• Archives network performance data
Analysis Engine• Analyzes network data• Provide plain text advice to solve
problems or increase performance
User Interface• Expert Interface: table & tree of metrics• Map Interface: graphical display of network• Analysis Interface: interact with Analysis Engine
All components written in Java and use XML-RPC
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Performance Data Collector (PDC)• Designed to be stand-alone, extensible, and portable
• Elegantly handles platform differences and unavailability of any given measurement
• Overview of Features– Uses bundles to facilitate integration of performance data measurement
tools
• A collection of scripts or Java classes that describe:– How to invoke a measurement tool
– What metrics the measurement tool measures
– How to parse the measurement tool's output
– Implements an XML-RPC interface• getAllMetrics: returns the list of metrics that may be measured
• getMeasurement, getMeasurements, getAllMeasurements: returns an individual, a list, or all measurements given a remote host
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PDC Features– All requests are fulfilled immediately without any caching – Activation
• Allows cooperation of both ends through a mechanism called activation (i.e. for tools such as Iperf)
– Security
• Using SSL and username/password (more to come)
– Autoupdating
• Periodically updates the bundles (automatically)
• User can set how often to check for updates
• All system bundles updated
• Tool to update bundles on demand
– Global Grid Forum NM-WG Response Schema• Full Java class support for reading and writing in the schema
– Bundle support for NM-WG Response Schema
– Version 2.0 will use the NM-WG Request Schema
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Performance Data Historical ArchiverShort to medium-term storage of PDC measurements
• Overview of Features:– Act as a caching proxy for the PDC
• Specify how much data to store, and for how long.
– Utilizes an XML-RPC interface to retrieve data• Clients can retrieve old measurement results and the latest measurement
results• Clients can force PDHA to request new measurements from PDC
– To retrieve archived measurements specify an • interval: returns all measurements taken during the specified interval • list of timestamps: returns all measurements that match a timestamp in the
list, with some amount of error allowed.
– Allow different measurements to have different “lifetimes”– Stores data on disk in XML file– Ability to query third party databases with the NM-WG Request
schema (v. 2.0)
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Analysis EngineAnalyze metrics for a specific end-to-end path and give advice to solve performance or connectivity problems
• Features:
– “Test Definition Files” (TDFs) similar to PDC’s ADFs• TDFs consist of
– detection rules: simple binary operations (AND, OR, NOT, etc)
– synthetic metrics file name
– problem descriptions, and solutions
• Synthetic Metrics– operations on base metrics
– may be written in any scripting language (and eventually Java)
– Constructs a decision tree for each problem
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Analysis Engine
• Example TDFS include: – Duplex mismatch, incorrect buffer sizes, incorrect settings, congestion,
general connectivity issues.
• Future Development:– Relate TDFs to each other (in v. 2.0)
– Group TDFs into families
– Modify Analysis Engine to use historical data
– Engage the network engineering community to obtain more analysis test cases
– Bi-directional testing (in v. 2.0)
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Displays Advisor’s collected network metrics and is capable of displaying outside metrics acquired in the GGF’s NM-WG schema.
• Three main graphical displays
– Metric Display GUI: Displays all metrics• uses a tree to organize metrics• uses a table to display metrics and corresponding information
– Analysis GUI: Displays advice reported from the analysis engine• text display of analysis and advice
– Map GUI: Visual display of the network and trouble spots• users will be able to click on a map to view measurements for specific
areas along the path
Advisor GUI
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Thank You !
dast.nlanr.net/projects/advisor