(v2.6.1)= # Mantid 2.6.1 Release Notes ```{note} These release notes were migrated from the retired Mantid wiki (archive.mantidproject.org). Trac ticket numbers are given for reference alongside the GitHub issue the ticket was migrated to. ``` | Patch Release | | | --------------------- | --------------- | | Version | 2.6.1 | | Requested by | Nick Draper | | Approved by | Stuart Campbell | | Authorised on | 08 Aug 2013 | | Code Reviewed by | Stuart Campbell | | Code Reviewed on | 12-15 Aug 2013 | | Review Recommendation | Release | | Released on | 20 Aug 2013 | ## Key Features This is a patch release to correct some significant issues since the {ref}`last full release `. There are updates to fix a threading issue causing problems with the reduction of certain large instruments, a problem when adding SANS event files, improvements to MPI processing, corrections to some instrument geometries and some improvements to EQSANS reduction. ## Changes in this version | Ticket | Problem | Impact | Solution | | ------------------------------------------------------------------------ | ---------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------ | | [#8398](https://github.com/mantidproject/mantid/issues/8398) (Trac 7553) | Improvements to NOMAD autoreduction with MPI | Problems with the MPI reduction prevented usage. | Rebin into histograms rather than maintain event data. ensure correct chunking of the can and vanadium files | | [#8445](https://github.com/mantidproject/mantid/issues/8445) (Trac 7600) | Defect on SANS2D adding data | Event data files can be corupted when adding files togeter using the SANS interface. | Correctly take into account any monitors when merging event files | | [#8522](https://github.com/mantidproject/mantid/issues/8522) (Trac 7677) | Reduction for several inelastic instruments hangs part way through reduction | Instruments such as TOSCA, MERLIN and LET cannot use Mantid v2.6 to reduce their data. | Use lazy loading for Workspace details and improve locking approaches | | [#8530](https://github.com/mantidproject/mantid/issues/8530) (Trac 7685) | MPI runs can fail in SNSPowderReduction | In sertain situations the reduction could fail part way through | Added a check that the data is indeed still in events before running CompressEvents. | | [#8544](https://github.com/mantidproject/mantid/issues/8544) (Trac 7699) | EQSANS: reducing existing workspace fails | Reduction has to use the file every time even if it is already loaded | This used to work in previous versions, correct the area of the scripts that does not support this | | [#8546](https://github.com/mantidproject/mantid/issues/8546) (Trac 7701) | EQSANS: make sure transmission workspaces are created | | | | [#8550](https://github.com/mantidproject/mantid/issues/8550) (Trac 7705) | Load not working with Dave grouped file with different extension | GRP files with a .dat extension are not shown | Add \*.dat onto the list of extensions | | [#8563](https://github.com/mantidproject/mantid/issues/8563) (Trac 7718) | "Do Not Rebin" option causes error with TOSCA | | | | [#8565](https://github.com/mantidproject/mantid/issues/8565) (Trac 7720) | Problem with boolean properties and GUI | Boolean properties that have a default of true do not get set | Revert change that caused the issue | | [#8589](https://github.com/mantidproject/mantid/issues/8589) (Trac 7744) | Default values are not being shown when running algorithm dialog form script interpreter | Some algorithms might not work in the way that users are used to | Fix the problem with default value logic | | [#8611](https://github.com/mantidproject/mantid/issues/8611) (Trac 7766) | Mistake in latest powgen geometry | POWGEN files from current run cycle | Updated instrument geometry | ## Code Review ### Review of Specific Changes | Ticket | Problem | Implementation Notes | Probability of side effects | Merged | | ------------------------------------------------------------------------ | ---------------------------------------------------------------------------------------- | ------------------------------ | --------------------------- | ------ | | [#8398](https://github.com/mantidproject/mantid/issues/8398) (Trac 7553) | Improvements to NOMAD autoreduction with MPI | | Medium | 12-Aug | | [#8445](https://github.com/mantidproject/mantid/issues/8445) (Trac 7600) | Defect on SANS2D adding data | Only effects ISIS SANS | Low | 12-Aug | | [#8522](https://github.com/mantidproject/mantid/issues/8522) (Trac 7677) | Reduction for several inelastic instruments hangs part way through reduction | | Medium | 12-Aug | | [#8530](https://github.com/mantidproject/mantid/issues/8530) (Trac 7685) | MPI runs can fail in SNSPowderReduction | | Low | 12-Aug | | [#8544](https://github.com/mantidproject/mantid/issues/8544) (Trac 7699) | EQSANS: reducing existing workspace fails. | | Low | 12-Aug | | [#8546](https://github.com/mantidproject/mantid/issues/8546) (Trac 7701) | EQSANS: make sure transmission workspaces are created | | Medium | 13-Aug | | [#8550](https://github.com/mantidproject/mantid/issues/8550) (Trac 7705) | Load not working with Dave grouped file with different extension | \*.dat added | Low | 15-Aug | | [#8563](https://github.com/mantidproject/mantid/issues/8563) (Trac 7718) | "Do Not Rebin" option causes error with TOSCA | | Low | 13-Aug | | [#8565](https://github.com/mantidproject/mantid/issues/8565) (Trac 7720) | Problem with boolean properties and GUI | Only effects EQSANS | Low | 13-Aug | | [#8589](https://github.com/mantidproject/mantid/issues/8589) (Trac 7744) | Default values are not being shown when running algorithm dialog form script interpreter | | Low | 19-Aug | | [#8611](https://github.com/mantidproject/mantid/issues/8611) (Trac 7766) | Mistake in latest powgen geometry | Only effect newer POWGEN files | Low | 16-Aug | ### Are any changes included in the release that are not accounted for above? None ### Is the collective effect of the changes acceptably low risk? Yes ### Code Reviewer Recommendation Deploy