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
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
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#
Index of all Sys routines
Table of Contents for all manual pages
Index of all manual pages