mpi4py.MPI.File

class mpi4py.MPI.File(file=None)

Bases: object

File handle

Parameters

file (Optional[File]) –

Return type

File

static __new__(cls, file=None)

Parameters

file (Optional[File]) –

Return type

File

Methods Summary

Call_errhandler(errorcode)	Call the error handler installed on a file
Close()	Close a file
Delete(filename[, info])	Delete a file
Get_amode()	Return the file access mode
Get_atomicity()	Return the atomicity mode
Get_byte_offset(offset)	Return the absolute byte position in the file corresponding to 'offset' etypes relative to the current view
Get_errhandler()	Get the error handler for a file
Get_group()	Return the group of processes that opened the file
Get_info()	Return the hints for a file that that are currently in use
Get_position()	Return the current position of the individual file pointer in etype units relative to the current view
Get_position_shared()	Return the current position of the shared file pointer in etype units relative to the current view
Get_size()	Return the file size
Get_type_extent(datatype)	Return the extent of datatype in the file
Get_view()	Return the file view
Iread(buf)	Nonblocking read using individual file pointer
Iread_all(buf)	Nonblocking collective read using individual file pointer
Iread_at(offset, buf)	Nonblocking read using explicit offset
Iread_at_all(offset, buf)	Nonblocking collective read using explicit offset
Iread_shared(buf)	Nonblocking read using shared file pointer
Iwrite(buf)	Nonblocking write using individual file pointer
Iwrite_all(buf)	Nonblocking collective write using individual file pointer
Iwrite_at(offset, buf)	Nonblocking write using explicit offset
Iwrite_at_all(offset, buf)	Nonblocking collective write using explicit offset
Iwrite_shared(buf)	Nonblocking write using shared file pointer
Open(comm, filename[, amode, info])	Open a file
Preallocate(size)	Preallocate storage space for a file
Read(buf[, status])	Read using individual file pointer
Read_all(buf[, status])	Collective read using individual file pointer
Read_all_begin(buf)	Start a split collective read using individual file pointer
Read_all_end(buf[, status])	Complete a split collective read using individual file pointer
Read_at(offset, buf[, status])	Read using explicit offset
Read_at_all(offset, buf[, status])	Collective read using explicit offset
Read_at_all_begin(offset, buf)	Start a split collective read using explict offset
Read_at_all_end(buf[, status])	Complete a split collective read using explict offset
Read_ordered(buf[, status])	Collective read using shared file pointer
Read_ordered_begin(buf)	Start a split collective read using shared file pointer
Read_ordered_end(buf[, status])	Complete a split collective read using shared file pointer
Read_shared(buf[, status])	Read using shared file pointer
Seek(offset[, whence])	Update the individual file pointer
Seek_shared(offset[, whence])	Update the shared file pointer
Set_atomicity(flag)	Set the atomicity mode
Set_errhandler(errhandler)	Set the error handler for a file
Set_info(info)	Set new values for the hints associated with a file
Set_size(size)	Sets the file size
Set_view([disp, etype, filetype, datarep, info])	Set the file view
Sync()	Causes all previous writes to be transferred to the storage device
Write(buf[, status])	Write using individual file pointer
Write_all(buf[, status])	Collective write using individual file pointer
Write_all_begin(buf)	Start a split collective write using individual file pointer
Write_all_end(buf[, status])	Complete a split collective write using individual file pointer
Write_at(offset, buf[, status])	Write using explicit offset
Write_at_all(offset, buf[, status])	Collective write using explicit offset
Write_at_all_begin(offset, buf)	Start a split collective write using explict offset
Write_at_all_end(buf[, status])	Complete a split collective write using explict offset
Write_ordered(buf[, status])	Collective write using shared file pointer
Write_ordered_begin(buf)	Start a split collective write using shared file pointer
Write_ordered_end(buf[, status])	Complete a split collective write using shared file pointer
Write_shared(buf[, status])	Write using shared file pointer
f2py(arg)
py2f()

Attributes Summary

amode	file access mode
atomicity
group	file group
info	file info
size	file size

Methods Documentation

Call_errhandler(errorcode)

Call the error handler installed on a file

Parameters

errorcode (int) –

Return type

None

Close()

Close a file

Return type

None

classmethod Delete(filename, info=INFO_NULL)

Delete a file

Parameters

• filename (str) –

• info (Info) –

Return type

None

Get_amode()

Return the file access mode

Return type

int

Get_atomicity()

Return the atomicity mode

Return type

bool

Get_byte_offset(offset)

Return the absolute byte position in the file corresponding to ‘offset’ etypes relative to the current view

Parameters

offset (int) –

Return type

int

Get_errhandler()

Get the error handler for a file

Return type

Errhandler

Get_group()

Return the group of processes that opened the file

Return type

Group

Get_info()

Return the hints for a file that that are currently in use

Return type

Info

Get_position()

Return the current position of the individual file pointer in etype units relative to the current view

Return type

int

Get_position_shared()

Return the current position of the shared file pointer in etype units relative to the current view

Return type

int

Get_size()

Return the file size

Return type

int

Get_type_extent(datatype)

Return the extent of datatype in the file

Parameters

datatype (Datatype) –

Return type

int

Get_view()

Return the file view

Return type

Tuple[int, Datatype, Datatype, str]

Iread(buf)

Nonblocking read using individual file pointer

Parameters

buf (BufSpec) –

Return type

Request

Iread_all(buf)

Nonblocking collective read using individual file pointer

Parameters

buf (BufSpec) –

Return type

Request

Iread_at(offset, buf)

Nonblocking read using explicit offset

Parameters

• offset (int) –

• buf (BufSpec) –

Return type

Request

Iread_at_all(offset, buf)

Nonblocking collective read using explicit offset

Parameters

• offset (int) –

• buf (BufSpec) –

Return type

Request

Iread_shared(buf)

Nonblocking read using shared file pointer

Parameters

buf (BufSpec) –

Return type

Request

Iwrite(buf)

Nonblocking write using individual file pointer

Parameters

buf (BufSpec) –

Return type

Request

Iwrite_all(buf)

Nonblocking collective write using individual file pointer

Parameters

buf (BufSpec) –

Return type

Request

Iwrite_at(offset, buf)

Nonblocking write using explicit offset

Parameters

• offset (int) –

• buf (BufSpec) –

Return type

Request

Iwrite_at_all(offset, buf)

Nonblocking collective write using explicit offset

Parameters

• offset (int) –

• buf (BufSpec) –

Return type

Request

Iwrite_shared(buf)

Nonblocking write using shared file pointer

Parameters

buf (BufSpec) –

Return type

Request

classmethod Open(comm, filename, amode=MODE_RDONLY, info=INFO_NULL)

Open a file

Parameters

• comm (Intracomm) –

• filename (str) –

• amode (int) –

• info (Info) –

Return type

File

Preallocate(size)

Preallocate storage space for a file

Parameters

size (int) –

Return type

None

Read(buf, status=None)

Read using individual file pointer

Parameters

• buf (BufSpec) –

• status (Optional[Status]) –

Return type

None

Read_all(buf, status=None)

Collective read using individual file pointer

Parameters

• buf (BufSpec) –

• status (Optional[Status]) –

Return type

None

Read_all_begin(buf)

Start a split collective read using individual file pointer

Parameters

buf (BufSpec) –

Return type

None

Read_all_end(buf, status=None)

Complete a split collective read using individual file pointer

Parameters

• buf (BufSpec) –

• status (Optional[Status]) –

Return type

None

Read_at(offset, buf, status=None)

Read using explicit offset

Parameters

• offset (int) –

• buf (BufSpec) –

• status (Optional[Status]) –

Return type

None

Read_at_all(offset, buf, status=None)

Collective read using explicit offset

Parameters

• offset (int) –

• buf (BufSpec) –

• status (Optional[Status]) –

Return type

None

Read_at_all_begin(offset, buf)

Start a split collective read using explict offset

Parameters

• offset (int) –

• buf (BufSpec) –

Return type

None

Read_at_all_end(buf, status=None)

Complete a split collective read using explict offset

Parameters

• buf (BufSpec) –

• status (Optional[Status]) –

Return type

None

Read_ordered(buf, status=None)

Collective read using shared file pointer

Parameters

• buf (BufSpec) –

• status (Optional[Status]) –

Return type

None

Read_ordered_begin(buf)

Start a split collective read using shared file pointer

Parameters

buf (BufSpec) –

Return type

None

Read_ordered_end(buf, status=None)

Complete a split collective read using shared file pointer

Parameters

• buf (BufSpec) –

• status (Optional[Status]) –

Return type

None

Read_shared(buf, status=None)

Read using shared file pointer

Parameters

• buf (BufSpec) –

• status (Optional[Status]) –

Return type

None

Seek(offset, whence=SEEK_SET)

Update the individual file pointer

Parameters

• offset (int) –

• whence (int) –

Return type

None

Seek_shared(offset, whence=SEEK_SET)

Update the shared file pointer

Parameters

• offset (int) –

• whence (int) –

Return type

None

Set_atomicity(flag)

Set the atomicity mode

Parameters

flag (bool) –

Return type

None

Set_errhandler(errhandler)

Set the error handler for a file

Parameters

errhandler (Errhandler) –

Return type

None

Set_info(info)

Set new values for the hints associated with a file

Parameters

info (Info) –

Return type

None

Set_size(size)

Sets the file size

Parameters

size (int) –

Return type

None

Set_view(disp=0, etype=BYTE, filetype=None, datarep='native', info=INFO_NULL)

Set the file view

Parameters

• disp (int) –

• etype (Datatype) –

• filetype (Optional[Datatype]) –

• datarep (str) –

• info (Info) –

Return type

None

Sync()

Causes all previous writes to be transferred to the storage device

Return type

None

Write(buf, status=None)

Write using individual file pointer

Parameters

• buf (BufSpec) –

• status (Optional[Status]) –

Return type

None

Write_all(buf, status=None)

Collective write using individual file pointer

Parameters

• buf (BufSpec) –

• status (Optional[Status]) –

Return type

None

Write_all_begin(buf)

Start a split collective write using individual file pointer

Parameters

buf (BufSpec) –

Return type

None

Write_all_end(buf, status=None)

Complete a split collective write using individual file pointer

Parameters

• buf (BufSpec) –

• status (Optional[Status]) –

Return type

None

Write_at(offset, buf, status=None)

Write using explicit offset

Parameters

• offset (int) –

• buf (BufSpec) –

• status (Optional[Status]) –

Return type

None

Write_at_all(offset, buf, status=None)

Collective write using explicit offset

Parameters

• offset (int) –

• buf (BufSpec) –

• status (Optional[Status]) –

Return type

None

Write_at_all_begin(offset, buf)

Start a split collective write using explict offset

Parameters

• offset (int) –

• buf (BufSpec) –

Return type

None

Write_at_all_end(buf, status=None)

Complete a split collective write using explict offset

Parameters

• buf (BufSpec) –

• status (Optional[Status]) –

Return type

None

Write_ordered(buf, status=None)

Collective write using shared file pointer

Parameters

• buf (BufSpec) –

• status (Optional[Status]) –

Return type

None

Write_ordered_begin(buf)

Start a split collective write using shared file pointer

Parameters

buf (BufSpec) –

Return type

None

Write_ordered_end(buf, status=None)

Complete a split collective write using shared file pointer

Parameters

• buf (BufSpec) –

• status (Optional[Status]) –

Return type

None

Write_shared(buf, status=None)

Write using shared file pointer

Parameters

• buf (BufSpec) –

• status (Optional[Status]) –

Return type

None

classmethod f2py(arg)

Parameters

arg (int) –

Return type

File

py2f()

Return type

int

Attributes Documentation

amode

file access mode

atomicity

group

file group

info

file info

size

file size