Re #21631. MPI support for LoadEventAndCompress.

Framework/WorkflowAlgorithms/inc/MantidWorkflowAlgorithms/LoadEventAndCompress.h

@@ -45,6 +45,10 @@ protected:
   API::MatrixWorkspace_sptr processChunk(API::MatrixWorkspace_sptr &wksp,
                                          double filterBadPulses);
 
+  Parallel::ExecutionMode getParallelExecutionMode(
+      const std::map<std::string, Parallel::StorageMode> &storageModes)
+      const override;
+
 private:
   void init() override;
   void exec() override;

Framework/WorkflowAlgorithms/src/LoadEventAndCompress.cpp

@@ -239,5 +239,11 @@ void LoadEventAndCompress::exec() {
   setProperty("OutputWorkspace", total);
 }
 
+Parallel::ExecutionMode LoadEventAndCompress::getParallelExecutionMode(
+    const std::map<std::string, Parallel::StorageMode> &storageModes) const {
+  static_cast<void>(storageModes);
+  return Parallel::ExecutionMode::Distributed;
+}
+
 } // namespace WorkflowAlgorithms
 } // namespace Mantid

dev-docs/source/AlgorithmMPISupport.rst

@@ -542,6 +542,7 @@ LoadCanSAS1D                           Identical               see ``IFileLoader
 LoadDaveGrp                            Identical               see ``IFileLoader``
 LoadDiffCal                            Identical
 LoadEmptyInstrument                    Identical               see ``IFileLoader``
+LoadEventAndCompress                   Distributed
 LoadEventNexus                         Distributed             storage mode of output cannot be changed via a parameter currently, min and max bin boundary are not globally the same
 LoadEventPreNexus2                     Identical               see ``IFileLoader``
 LoadFITS                               Identical               see ``IFileLoader``