about option database

[Yixun Liu]

Hi,

I am reading the source code of $PETSC_DIR\src\ksp\ksp\examples\tutorials\ex2.c. Some codes are,
...
  PetscInitialize(&argc,&args,(char *)0,help);
  ierr = PetscOptionsGetInt(PETSC_NULL,"-m",&m,PETSC_NULL);CHKERRQ(ierr);
...
However, I cannot find the default option database file .petscrc in user home directory. 

Regards,

Yixun

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