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+---
+name: DIALS core meeting 2023-11-30
+tags: core meeting
+---
+
+# DIALS core meeting 2023-11-30
+
+## Previous Actions
+
+- [ ] **ND**: PR to remove `std::string` support for messagepack from dials code
+- [ ] **ND** Investigate getting `psana` tests running on the DIALS xfel-regression testing
+- [ ] **ND** or **DW**: Cannot view reciprocal lattice using dials.reciprocal_lattice_viewer [#2443](https://github.com/dials/dials/issues/2443)
+    - Probably needs someone to dig into windows gltbx behaviour, or at least work out where issue lies
+    - Reports from CCP4 workshop that people are having issue on latest ubuntu
+    - David reproduced the problem which is progress...
+- **ND**: Investigate using stable-nightly conda builds of cctbx (e.g. cctbx tests) longer term
+
+## Agenda
+
+### small cell serialtbx
+https://github.com/dials/dials/pull/2477 - small cell code did not make it into serialtbx yet.
+
+- Previously:
+    - AB: Did small cell xfel recently. Had sequences indexer success over stills.
+        - Ran sweeps indexer. Many bad indexing solutions, suspect differences down to index assignment tolerance at 0.3 hkl by default
+        - Can still move code into serial toolbox, but don't think best end solution is obvious yet
+    - Dan experience using new small cell algorithm - does index a lot of "nonsense" when you give it an incorrect unit cell, so went back to small_cell_process command line tool. Now need to dig into why it claims to work when it didn't (yay false positive debug) - on the whole good step in right direction. Work continues.
+- Time needs to be applied.
+
+### dials.cosym finds the right operator but puts it wrongly
+- [dials#2486](https://github.com/dials/dials/issues/2486)
+- Draft PR at https://github.com/dials/dials/pull/2497
+- Pulled in other problems that need to be worked through
+- Potential fix opened a large box of problems
+- GW believes needs a rethink and a rewrite and patching is essentially impossible
+- GW and DP to discuss on 27th
+    - Met! DP has made some progress but had other obligations
+- Recent attempt... regression test pass but Takanori's case still fails
+- We are back where we started, but with a better understanding of the problem and some belief that what we are doing is correct => the issue is perhaps somewhere else
+- DP to continue on the quest
+- JBE Solved!
+  - For some symmetries, lattice/space group symmetries were misapplied
+  - PR: https://github.com/dials/dials/pull/2548
+  - Merge!
+
+### Build fails on latest ventura
+- https://github.com/dials/dials/issues/2522
+- GW to update from 13.3 to 13.6 to try this out
+- ND Looked but could not replicate, need to reinvestigate with more of user's environment
+    - **ND**: Follow up
+    - **GW**: Also had a quick look, missing `exe_dev`
+
+### Reports of build failures on RHEL8
+- JBE noticed some CI tests started to fail on linux / bootstrap but not regular linux
+- Should we think about moving the default to a cmake build (DP notes this would diverge further from the XFEL regression tests)
+- JBE to test clean bootstrap in RHEL8 (ws448)
+    - Now Working
+    - ND planning to move DIALS to prebuilt CCTBX
+
+### Starting January DLS Loan of RSE
+- We have someone who can do some work for 6 months on the actual codebase, refactoring, tidying etc. with a view to future optimisation
+
+### Add support for Pilatus 4
+- GW has data, has promised to ensure works - apropos to this the current issue is 
+- Pls can has review on https://github.com/cctbx/dxtbx/pull/663
+    - DECTRIS fixed a bug that inverted order
+    - Now Merged
+
+### Removing setting batch offset when creating imagesets
+
+- https://github.com/cctbx/dxtbx/pull/662
+- We no longer need the batch offset => we can just remove it after changes by DGW
+- Much testing and reviews please
+- DP also to test via XFEL-regression
+- JBE holding off for more testing
+
+
+### Changes to retain unindexed reflections in indexers (mainly stills)
+- https://github.com/dials/dials/pull/2545
+
+## AOB?
+
+### Optimisation Post
+- DLS Hiring someone to work on performance optimisation
+- A position on the DIALS grant hiring soon
+
+### XFEL CI
+- MPI backend changes has caused test failures due to output changes
+- Finding HDF5 mpi installed even when not requested
+- Some fixes to check imports ready to add to XFEL CI
+
+
+### JBE Demos
+- Demoing structural changes to indexing/retaining unindexed images
+- Very exciting!
+
+
+### Next meeting
+
+Thursday, December 14th, 4pm (GMT), 8am (PST)