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Working with Instrument Data (GlobusWorld Tour - UMich)

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Presented at the GlobusWorld Tour workshop at the University of Michigan, on July 22, 2019.

Published in: Data & Analytics
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Working with Instrument Data (GlobusWorld Tour - UMich)

  1. 1. Working with Instrument Data Ryan Chard rchard@anl.gov
  2. 2. Overview • Data management challenges • Managing instrument data with Globus • Use cases and lessons learned • Notebook demo
  3. 3. Data management challenges • Event Horizon Telescope – 12 telescopes – Generate 900TB per 5 day run – Data written to ~1000 HDDs – Transported to MIT & Max Planck via airplane – Aggregated and analyzed • Global resources, long timescales • Too much data for manual processing • Data loss due to HDD failure
  4. 4. Research data management challenges • Data acquired at various locations/times • Analyses executed on distributed resources • Catalogs of descriptive metadata and provenance • Dynamic collaborations around data and analysis Raw data store Catalog DOE LabCampus Community Archive NIH
  5. 5. Exacerbated by large scale science • Best practices overlooked, useful data forgotten, errors propagate • Researchers allocated short periods of instrument time • Inefficiencies -> less science • Errors -> long delays, missed opportunity …forever!
  6. 6. Scientific Data Lifecycle data.library.virginia.edu/data-management/lifecycle/
  7. 7. Goal Automate data manipulation tasks from acquisition, transfer and sharing, to publication, indexing, analysis, and inference
  8. 8. Automation and Globus • Globus provides a rich data management ecosystem for both admins and researchers • Compose multiple services into reliable, secure data management pipelines • Execute on behalf of users • Create data-aware automations that respond to data events
  9. 9. Globus Services • Transfer: Move data, set ACLs, create shares • Search: Find data, catalog metadata • Identifiers: Mint persistent IDs for datasets • Auth: Glue that ties everything together
  10. 10. Globus Auth • Programmatic and secure access to both Globus services and any third party services that support it • Grant permission to apps to act on your behalf – Dependent tokens • Refresh tokens enable one-time authentication that can be put into long-running pipelines
  11. 11. Automation via Globus Glue services together • Globus SDK (docs.globus.org) • Scripting with the Globus CLI – globus task wait • Automate
  12. 12. Example Use Cases • Advanced Photon Source – Connectomics – Time series spectroscopy • Scanning Electron Microscope
  13. 13. UChicago Kasthuri Lab: Brain aging and disease • Construct connectomes—mapping of neuron connections • Use APS synchrotron to rapidly image brains – Beam time available once every few months – ~20GB/minute for large (cm) unsectioned brains • Generate segmented datasets/visualizations for the community • Perform semi-standard reconstruction on all data across HPC resources
  14. 14. Original Approach • Collect data—20 mins • Move to a local machine • Generate previews for a couple of images—5 mins • Collect more data • Initiate local reconstruction—1 hour • Batch process the rest after beamtime
  15. 15. Advanced Photon Source Argonne Leadership Computing Facility 1 km 5μsec 15
  16. 16. Requirements • Accomodate many different beamline users of different skillsets – Automatically apply a “base” reconstruction to data • Leverage HPC due to computational requirements • Unobstructive to the user
  17. 17. Ripple: A Trigger-Action platform for data • Provided set of triggers and actions to create rules • Ripple processes data triggers and reliably executes actions • Usable by non-experts • Daisy-chain rules for complex flows Not product!
  18. 18. Data-driven automation • Filesystem-specific tools monitor and report events – inotify (Linux – FSWatch (macOS) • Capture local data events – Create, delete, move Watchdog: github.com/gorakhargosh/watchdog
  19. 19. Argonne JLSEUChicago Argonne Leadership Computing FacilityAPS Publication7 Building the connectome Imaging1 Lab Server 1 Acquisition2 Lab Server 2 Pre-processing3 Preview/Center4 Reconstruction6Visualization8 User validation5 Science!9 Neuroanatomy reconstruction pipeline
  20. 20. New Approach • Detect data as they are collected • Automaticlaly move data to ALCF • Initiate a preview and reconstruction • Detect the preview and move it back to the APS • Move results to shared storage • Catalog data in Search for users to explore
  21. 21. Lessons Learned • Automate data capture where possible - far easier than convincing people to run things • Transparency is critical - operators need the ability to debug at 3am • “Manual” automation is better than no automation
  22. 22. Scanning Electron Microscope Rapidly process SEM images to flag bad data while samples are still in the machine Good Bad
  23. 23. SEM Focus 1. Slice the image into 6 random subsections 1. Apply Laplacian blob detection 1. Use NN to classify as in or out of focus Credit: Aarthi Koripelly
  24. 24. DLHub • Collect, publish, categorize models from many disciplines (materials science, physics, chemistry, genomics, etc.) • Serve model inference on-demand via API to simplify sharing, consumption, and access • Enable new science through reuse, real-time model-in- the-loop integration, and synthesis & ensembling of existing models
  25. 25. Using DLHub 1 2 3 Describe Publish Run Secured with Globus Auth to verify users Inference are performed at ALCF’s PetrelKube Use Globus-accessible data as inputs (HTTPS)
  26. 26. Processing SEM Data with DLHub • Detect files placed in a “/process” directory • Move data to Petrel • Generate input for DLHub • Invoke DLHub • Put results in a Search index for users • Append to a list in a “/results” folder
  27. 27. Example
  28. 28. Lessons Learned • Perfect, complex hooks are sometimes unnecessary • No value if the user can’t easily find and use the result • Outsource and leverage special-purpose services – You don’t need to do everything
  29. 29. X-ray Photon Correlation Spectroscopy • APS Beamline 8-ID • Generate a lot of data – Images every ~10 seconds • Apply XPCS-Eigen tool to HDF files containing many images
  30. 30. Current Approach • Internal workflow engine is started in response to data • Enormous bash scripts everywhere • Restricted to local resources • Any new tools must fit into their dashboard
  31. 31. Current Approach • Plug in a new step to kick off Globus actions • Fits into existing dashboards • Easy for them to debug -- stand alone, or in the flow
  32. 32. Lessons Learned • Everyone loves automation • Everyone has a “working” solution and doesn’t want to change • Make results easy to find - no value without results • HPC timeouts are still a pain
  33. 33. Thanks! Questions? rchard@anl.gov

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