petsc-3.13.6 2020-09-29
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Writes to a binary file.


PetscErrorCode  PetscBinaryWrite(int fd,const void *p,PetscInt n,PetscDataType type)
Not Collective

Input Parameters

fd - the file
p - the buffer
n - the number of items to write
type - the type of items to read (PETSC_INT, PETSC_DOUBLE or PETSC_SCALAR)


PetscBinaryWrite() uses byte swapping to work on all machines; 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 ./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.

If running with __float128 precision the output is in __float128 unless one uses the -binary_write_double option

The Buffer p should be read-write buffer, and not static data. This way, byte-swapping is done in-place, and then the buffer is written to the file.

This routine restores the original contents of the buffer, after it is written to the file. This is done by byte-swapping in-place the second time.

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

See Also

PetscBinaryRead(), PetscBinaryOpen(), PetscBinaryClose(), PetscViewerBinaryGetDescriptor(), PetscBinarySynchronizedWrite(),
PetscBinarySynchronizedRead(), PetscBinarySynchronizedSeek()







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