PETSc version 3.17.4
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# PetscViewerHDF5ReadSizes

Read block size and global size of a vector (Vec or IS) stored in an HDF5 file.

### Synopsis

    #include "petsclayoutdf5.h"
    #include "petscis.h"
    PetscErrorCode PetscViewerHDF5ReadSizes(PetscViewer viewer, const char name[], PetscInt *bs, PetscInt *N)

### Input Parameters

| viewer | - The HDF5 viewer
| name | - The dataset name

### Output Parameters

| bs | - block size
| N | - global size

### Notes

The dataset is stored as an HDF5 dataspace with 1-4 dimensions in the order 1) # timesteps (optional), 2) # blocks, 3) # elements per block (optional), 4) real and imaginary part (only for complex).

The dataset can be stored as a 2D dataspace even if its blocksize is 1; see PetscViewerHDF5SetBaseDimension2().

### See Also

PetscViewerHDF5Open(), VecLoad(), ISLoad(), VecGetSize(), ISGetSize(), PetscViewerHDF5SetBaseDimension2()

### Level

advanced

### Location

src/vec/is/utils/hdf5io.c
Index of all IS routines
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Index of all manual pages