en Copyright 2025 Java http://opengrok.kc2vjw.com:8080/history/petsc/src/vec/is/sf/tests/ex25.c#bfd699592f574147bd7f89503f112af3d83e42ad Merge branch 'jczhang/2024-09-09/fix-sf-mpi-large-count-datatype' into 'main'PetscSF: Support MPI derived data types created with large countCloses #1625See merge request petsc/petsc!7825 List of files: /petsc/src/vec/is/sf/tests/ex25.c Sun, 22 Sep 2024 03:33:03 +0000 Satish Balay <balay@mcs.anl.gov> http://opengrok.kc2vjw.com:8080/history/petsc/src/vec/is/sf/tests/ex25.c#d279a5e3c404e4066a02aab9a3709a6587f533f0 PetscSF: support MPI derived data types created with large countWhen user created MPI derived data types with large count routines, e.g., MPI_Type_contiguous_c(4, MPI_DOUBLE, &newtype), and passed newtype to PetscSF,is it legal to decode the datatype with MPI_Type_get_envelope()? The MPI Forum debated but has yet to resolve this issue.Our approach is to decode the datatype with MPI_Type_get_envelope_c() if available; otherwise with MPI_Type_get_envelope().But currently we don't really support real big count values, say a type created by MPI_Type_contiguous_c(2^33, MPI_DOUBLE, &newtype).We could support that, but just see no needs for now. We will error out if this kind of types are given to PetscSF. List of files: /petsc/src/vec/is/sf/tests/ex25.c Sun, 22 Sep 2024 03:33:03 +0000 Junchao Zhang <jczhang@mcs.anl.gov>