Page History

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• This is the case where a background is computed by a post-reduce box and fed to an upstream box
• We think we can avoid backward loops in this case by having one chain of post-gather boxes feed upstream boxes

Topics to Discuss

Epics

• Feel like it should be split out of the DAQ timestamped data
• recorded separately to hdf5 and handled by offline event builder
• for shmem another process would put epics in some separate buffer (like "epicsStore") for use by AMI

Data Interface

• boxes accept "datagrams" as input/output
• datagrams contain: evt ids (plural, must be >0), ami-graph-config number, metadata dictionary which has serializable python objects, data dictionary of numpy arrays

IOC Recorders

• hope these don't need to be processed by AMI, unless DAQ manages to bring them into the hutch-DAQ via "PGP broadcast"
• if they produce files like current system, AMI would handle them with psana offline event builder.

Projects

• ami "calculator"
• pyqtgraph graphical operations
• metadata
• slow data (epics)
• data interface (top-down vs. bottom-up design)
• IOC recorders

Packages to Consider

pyqtgraph

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