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• psana is now "dgram-type" driven (a.k.a "multirun" concept)
• "broadcast": calibration constants, configurations, 1Hz "slow update" transitions 
• support destination/filter/srv callbacks
• support step scans
• support environment store (motor positions, temperatures broadcast in slow-update transitions
• psana now uses prometheus to gather performance-monitoring data
• psana supports four modes of running: single-file, shmem, serial, parallel (will also support running in daq/drp in the future)
  • legion only needs to support parallel mode, but shouldn't interfere with the other modes
• not ideal: keep the callback interface for legion, vs. loop interface for psana?
• ideally run all tests: but could be difficult with two interfaces (callback/loop)

Legion

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Planning Meeting

April 26, 2022 with Mona, Elliott, Seema, Chris

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