Difference between revisions of "Atlas"

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** Monitor job efficiency vs RTT between SE and WN -> Identify when cache does not have impact (assuming no network bandwidth limitation)
 
** Monitor job efficiency vs RTT between SE and WN -> Identify when cache does not have impact (assuming no network bandwidth limitation)
 
** Understand the ATLAS job brokering algorithm
 
** Understand the ATLAS job brokering algorithm
 +
** Get the typical transfer rate per job type

Version du 19:31, 16 septembre 2018

Bienvenue sur la page Atlas LCG-France
Welcome to the LCG-France Atlas page

DOMA_FR tests

  • Global transfers from/ to (same site dest/source site excluded)
Header text LAPP LPSC CC
From

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To

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  • Data access monitorings as seen by site WN
Destination of access LAPP LPSC CC
Production download

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Production upload

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Production input

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Production output

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Analysis Download

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Analysis Direct Access

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  • Current conclusion
    • Enabling direct access creates much more network usage -> Is it usefull for ATLAS ? (processing urgent request faster ?)
    • Production job brokering prefers to send input data (Production_input) to IN2P3-CC_DATADISK instead of IN2P3-LAPP_DATADISK because single file connected is (expected to be better). Can we check if there are more temporary files in IN2P3-CC_DATADISK ?
    • 10 Gb/s connection LAPP-CC (used for all LAPP WAN transfers to any site) can get saturated if huge amount of jobs starting at same time (No smoothing by Panda)
    • Production_output can only be done to 1 site
  • Next steps
    • Deploy Rucio 1.17 to use protocol priority defined in AGIS (bug in 1.16). Solving bug : use most trusted protocol and would help to control srm decreasing usage
    • Monitor job efficiency vs RTT between SE and WN -> Identify when cache does not have impact (assuming no network bandwidth limitation)
    • Understand the ATLAS job brokering algorithm
    • Get the typical transfer rate per job type