In MPI-2 standard has the sentence below for MPI_File_delete. "If the file does not exist, MPI_FILE_DELETE raises an error in the class MPI_ERR_NO_SUCH_FILE." But in src/mpi/romio/adio/common/ad_delete.c, the return code of unlink() is not checked for this error (only MPI_ERR_IO class is thrown.) May I suggest to add a check, so the MPI_ERR_NO_SUCH_FILE class can reported. 19 err = unlink(filename); if (err == ENOENT) { *error_code = MPIO_Err_create_code(MPI_SUCCESS, MPIR_ERR_RECOVERABLE, myname, __LINE__, MPI_ERR_NO_SUCH_FILE, "**io", "**io %s", strerror(errno)); return; } else if (err == -1) { ... Wei-keng