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- Warren Matthews & Les Cottrell, SLAC.
- Presented at the NMWG@GGF8, Seattle
- June 24-27, 2003
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2
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- Implementation of Brian’s Schema/Profile for Network Performance
Measurements for Grids:
- As applied to:
- IEPM-PingER and IEPM-BW measurement projects
- I2 E2Epi OWAMP
- RIPE-tt
- Work in progress
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3
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- path.delay.oneWay, path.delay.roundTrip
- path.loss.oneWay, path.loss.roundTrip
- path.availability.roundtrip
- path.bandwidth.achievable.TCP
- path.bandwidth.achievable.TCP.multiStream
- path.bandwidth.available
- hop.bandwidth.capacity, hop.bandwidth.utilized
- properties
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4
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- No schema, need to understand OGSA/OGSI
- Main focus on implementing server
- To get started short cut schema for simplicity:
- Seemed reasonable that characteristics are separate methods
- But naming convention is NOT language neutral
- Based on GGF DAMED document
- Some languages use periods for special purposes
- Delimeters
- path.delay.oneWay -> pathDelayOneWay
- Or
- get(path.delay.oneWay:source:destination)
- getAll(source:destination)
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5
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- Currently only latest measurement
- Adding startTime:endTime
- pathDelayOneWay("tt81.ripe.net:tt28.ripe.net”,”
20021220003957:20021220004157”);
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6
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7
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8
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9
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10
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- NetworkTestToolType->toolName = ripe-tt
- Real time access to local copy of RIPE data
- Master copy archived at RIPE-NCC
- NetworkTestToolType->toolName = owamp
- Real time access to OWAMP central database
- Owamp creates its own summaries
- Number of events in a bin (how do we return multiple values)
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11
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- IEPM-BW uses several TCP tools
- iperf, bbcp, bbftp, gridftp
- How should this be returned?
- Input contains toolName?
- Return 3 objects with the same name
- Which should be the value of
$characteristic->{NetworkPathE2EAchievableStatistics}->{value}
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12
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- E2EAchievableTCPStatistics
- Average (value)
- peak
- Standard deviation, what about multiple streams
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13
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- Based on PingER unavailability
- NetworkPathAvailabilityStatisticsType
- MTBF uint32 O
- MTTR uint32 O
- downs uint32 O
- medianOutageLength uint32 O
- value real32 M
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14
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- Time series
- Ability to extract individual measurements for previously unthought of
statistics (CDF, skew, kurtosis, error-free seconds, conditional loss
…)
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15
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- OGSA/OGSI => Schemas
- Globus3
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16
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- Visit the documentation of the implementation
- http://www-iepm.slac.stanford.edu/tools/soap/MAGGIE.html
- Includes links to latest WSDL and XSD
- Send email
- warrenm@slac.stanford.edu
- Profile:
- http://www-didc.lbl.gov/NMWG/NMWG-profile.html
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17
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- Add time selection: pathDelayOneWay("tt81.ripe.net:tt28.ripe.net”,”
20021220003957:20021220004157”);
- Is it optional?
- Return average value, what about a list of the component values
- Is this a database query?
- path.bandwidth.achievable.[TCP|UDP].disk2disk.*
- Characteristic names returned if requesting multiple characteristics:
- getAll(source:destination)
- Use of asterisk?
- Accessing service with multiple tools for a single characteristic – how
to select the right characteristic:tool, if return all then how to know
which is which
- path.bandwidth.achievable.TCP.prediction
- How to do predictions, e.g. future time or another level
- Type is still E2EAchievableTCPStatistics
- Integrtaed/total property especially useful
- path.hops.oneWay
- Single string, comma delimited list of hops or full xml document per
hop or …?
- Route change boolean
- Cannot be summarized (median route)
- path.hops.roundTrip asymmetric
routing
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