PetscBinarySynchronizedWrite#
writes to a binary file.
Synopsis#
PetscErrorCode PetscBinarySynchronizedWrite(MPI_Comm comm, int fd, const void *p, PetscInt n, PetscDataType type)
Collective, No Fortran Support
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
typetype - the type of items to write (
PETSC_INT,PETSC_REALorPETSC_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
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#
Index of all Sys routines
Table of Contents for all manual pages
Index of all manual pages