PetscBinarySynchronizedWrite#

writes to a binary file.

Synopsis#

PetscErrorCode PetscBinarySynchronizedWrite(MPI_Comm comm, int fd, const void *p, PetscInt n, PetscDataType type)

Collective

Input Parameters#

  • comm - the MPI communicator

  • fd - the file

  • n - the number of items to write

  • p - the buffer, an array of the type that matches the value in type

  • type - the type of items to write (PETSC_INT, PETSC_REAL or PETSC_SCALAR)

Notes#

MPI rank 0 does a PetscBinaryWrite() the values on other MPI processes are not used

The files are written using big-endian ordering to the file. On little-endian machines the numbers are converted to the big-endian format when they are written to disk. When PETSc is configured using ./configure with --with-64-bit-indices the integers are written to the file as 64-bit integers, this means they can only be read back in when the option --with-64-bit-indices is used.

Because byte-swapping may be done on the values in data it cannot be declared const

WARNING#

This is NOT like PetscSynchronizedFPrintf()! This routine ignores calls on all but MPI rank 0, while PetscSynchronizedFPrintf() has all MPI processes print their strings in order.

See Also#

PetscBinaryWrite(), PetscBinaryOpen(), PetscBinaryClose(), PetscBinaryRead(), PetscBinarySynchronizedRead(), PetscBinarySynchronizedSeek()

Level#

developer

Location#

src/sys/fileio/sysio.c

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