---
# System prepended metadata

title: DIALS core meeting 2026-05-21
tags: [core meeting]

---

---
name: DIALS core meeting 2026-05-21
tags: core meeting
---

# DIALS core meeting 2026-05-21

## Previous Actions

- [ ] **ND** Investigate getting `psana` tests running on the DIALS xfel-regression testing
- [x] **ND**: Move dials.diamond.ac.uk to a redirect to dials.github.io
    - Caveat: Sub-path links either work or not, do not get redirected
    - Now have an idea who owns this, chasing it down

## Agenda

### Other CI Issues
- Installers failing on our internal CI machines. Down to launch logic in https://github.com/dials/dials/blob/e91f5f66368ec546b160ccfd2fbd30b2926a65de/installer/create_installer.py#L36-L52 that prefers python2.7 if available - looks like conda-pack switched to requiring python 3.
- Probably easiest way for now is to just use `python`/`python3` and remove the fallbacks.
- DIALS release 3.28 been asked for - hopefully will solve other background issues
- ND to look at getting release out tomorrow
- 3.28 out, DGW reports some windows issues

### Metrics

- 2025-09-25 - dxtbx-side merged in, nothing yet in DIALS side to push it into the mtz history https://github.com/cctbx/dxtbx/pull/816
- Needs to be work to put in on DIALS side
- Work to do:
    - Need to package history into MTZ, but MTZ history not the right place. Decided MTZ-appendix is the right place to put this in, but work not started yet
    - Aaron has offered Yang's skills as his work should cover this area
    - [ Write integrate and scale history to MTZ #2924 ](https://github.com/dials/dials/pull/2924)
    - David to dig relevant information out
- MTZ Appendix: Some controversy
    - Phenix/DIALS not included in discussions
    - Fundamental technological issues
        - Mixing MTZ/CIF
- Gemmi supports
- AB met with BP/DGW/Oleg/Dorothy and talking about MTZ appendix issue
    - Conclusion: Nobody completely happy, AB to approach Clemens and get conversation going
- Dan Paley found issue with profiling and MTZ appendix https://github.com/cctbx/dxtbx/pull/867
    - Agreed looks reasonable
    - Requested David to have a look
    - All agreed, merge after newsfragment
    - Merged!
- **AB:** To make meeting with Clemens to try to find agreement that we probably need to just go with this
    - Have reached out over email


### Hamburg Work

- Hamburg: imageset, sequences, laziness so it works on 100,000 image HDF5 files
- Did some work in a branch to get stills_process to use imagesequences
- Nick did some work to eliminate need for check_format
- All of this is in branches that have not been revisited
- Discussion about still goniometer dogma
- Defer work until IUCR

### Shoebox object size
- DW raises performance issues, particularly with dials.integrate
    - Found issues [The Shoebox struct is overweight](https://github.com/dials/dials/issues/3117)
    - WIP: https://github.com/dials/dials/pull/3119
    - Dan working on getting tests run
    - This was merged!

### dials.index with max_lattices >= 2: rejection criteria

- https://github.com/dials/dials/issues/3110 dials.index with max_lattices >= 2: rejection criteria.
     - We think related to known symmetry
     - Wait until Graeme here
- Long discussion about integration memory usage and sample datasets.
- Graeme is here!
- Graeme is going to make efforts to come up with a plan for fixing this
- Interesting discussion about handling of multilattice data

## AOB




### Next meeting

Thursday, June 4th, 4pm (BST), 8am (PDT), 10am (CDT)