...

• 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

...

Planning Meeting

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

We discussed 7 pointsissues:

1. SlowUpdate support
2. Which interfaces to support?  (callbacks? low-level psiter? event loops?)
3. filter/destination callbacks on EB cores
4. small hdf5 production support ("SRV" nodes)
5. MTIP
6. detectors that integrate over time (e.g. 5kHz camera with 1MHz high-speed-digitizer)
7. Step support

...

As time permits Seema will do the legion-related work with advice from Mona, Elliott, Chris.  Legion may not support all features of psana (depending on time constraints) but we will try.