spinn_front_end_common.utilities package


spinn_front_end_common.utilities.constants module

class spinn_front_end_common.utilities.constants.BUFFERING_OPERATIONS[source]

Bases: enum.Enum

A listing of what SpiNNaker specific EIEIO commands there are.

spinn_front_end_common.utilities.constants.CLOCKS_PER_US = 200

The number of clock cycles per micro-second (at 200Mhz)

spinn_front_end_common.utilities.constants.DATA_SPECABLE_BASIC_SETUP_INFO_N_BYTES = 80

The number of words in the AbstractDataSpecable basic setup information. This is the amount required by the pointer table plus a SARK allocation.

spinn_front_end_common.utilities.constants.DEFAULT_BUFFER_SIZE_BEFORE_RECEIVE = 16384

The default size of a recording buffer before receive request is sent

spinn_front_end_common.utilities.constants.DSE_DATA_STRUCT_SIZE = 16

size of the on-chip DSE data structure required, in bytes

spinn_front_end_common.utilities.constants.MAX_DATABASE_PATH_LENGTH = 50000

Database file path maximum length for database notification messages. Note that this is not sent to SpiNNaker and so is not subject to the usual SDP limit.

spinn_front_end_common.utilities.constants.MAX_POSSIBLE_BINARY_SIZE = 33792

the ITCM max limit for a binary

spinn_front_end_common.utilities.constants.MAX_SAFE_BINARY_SIZE = 32768

the ITCM max safe limit for a binary

spinn_front_end_common.utilities.constants.MAX_SIZE_OF_BUFFERED_REGION_ON_CHIP = 1048576

max size expected to be used by the reverse ip_tag multicast source during buffered operations.

spinn_front_end_common.utilities.constants.NOTIFY_PORT = 19999

The default local port that the toolchain listens on for the notification protocol.

spinn_front_end_common.utilities.constants.PARTITION_ID_FOR_MULTICAST_DATA_SPEED_UP = 'DATA_SPEED_UP_ROAD'

partition IDs preallocated to functionality

spinn_front_end_common.utilities.constants.SARK_PER_MALLOC_SDRAM_USAGE = 8

The number of bytes used by SARK per memory allocation

class spinn_front_end_common.utilities.constants.SDP_PORTS[source]

Bases: enum.Enum

SDP port handling output buffering data streaming

class spinn_front_end_common.utilities.constants.SDP_RUNNING_MESSAGE_CODES[source]

Bases: enum.Enum

An enumeration.

spinn_front_end_common.utilities.constants.SDRAM_BASE_ADDR = 1879048192

start of where SDRAM starts (either unbuffered or buffered)

spinn_front_end_common.utilities.constants.SIMULATION_N_BYTES = 12

The number of bytes used by the simulation interface. This is one word for the machine_time_step, one for the SDP port, and one for the application hash.

spinn_front_end_common.utilities.constants.SYSTEM_BYTES_REQUIREMENT = 92

The number of bytes used by the DSG and simulation interfaces

spinn_front_end_common.utilities.exceptions module

exception spinn_front_end_common.utilities.exceptions.BufferableRegionTooSmall[source]

Bases: spinn_front_end_common.utilities.exceptions.SpinnFrontEndException

Raised when the SDRAM space of the region for buffered packets is too small to contain any packet at all

exception spinn_front_end_common.utilities.exceptions.BufferedRegionNotPresent[source]

Bases: spinn_front_end_common.utilities.exceptions.SpinnFrontEndException

Raised when trying to issue buffered packets for a region not managed

exception spinn_front_end_common.utilities.exceptions.CantFindSDRAMToUseException[source]

Bases: spinn_front_end_common.utilities.exceptions.SpinnFrontEndException

Raised when malloc and sdram stealing cannot occur.

exception spinn_front_end_common.utilities.exceptions.ConfigurationException[source]

Bases: spinn_front_end_common.utilities.exceptions.SpinnFrontEndException

Raised when the front end determines a input parameter is invalid

exception spinn_front_end_common.utilities.exceptions.ExecutableFailedToStartException[source]

Bases: spinn_front_end_common.utilities.exceptions.SpinnFrontEndException

Raised when an executable has not entered the expected state during start up

exception spinn_front_end_common.utilities.exceptions.ExecutableFailedToStopException[source]

Bases: spinn_front_end_common.utilities.exceptions.SpinnFrontEndException

Raised when an executable has not entered the expected state during execution

exception spinn_front_end_common.utilities.exceptions.ExecutableNotFoundException[source]

Bases: spinn_front_end_common.utilities.exceptions.SpinnFrontEndException

Raised when a specified executable could not be found

exception spinn_front_end_common.utilities.exceptions.RallocException[source]

Bases: spinn_front_end_common.utilities.exceptions.SpinnFrontEndException

Raised when there are not enough routing table entries

exception spinn_front_end_common.utilities.exceptions.SimulatorNotSetupException[source]

Bases: spinn_front_end_common.utilities.exceptions.SpinnFrontEndException

Raised when trying to get simulator before it has been setup

exception spinn_front_end_common.utilities.exceptions.SimulatorRunningException[source]

Bases: spinn_front_end_common.utilities.exceptions.SpinnFrontEndException

Raised when trying to running get simulator that should not be running

exception spinn_front_end_common.utilities.exceptions.SimulatorShutdownException[source]

Bases: spinn_front_end_common.utilities.exceptions.SpinnFrontEndException

Raised when trying to get simulator after it has been shit down

exception spinn_front_end_common.utilities.exceptions.SpinnFrontEndException[source]

Bases: Exception

Raised when the front end detects an error

spinn_front_end_common.utilities.globals_variables module


Returns the path to the directory that holds all app provenance files

This will be the path used by the last run call or to be used by the next run if it has not yet been called.

Raises:SimulatorNotSetupException – if the system has a status where path can’t be retrieved

Check if a simulator has been setup but not yet shut down

Raises:SimulatorNotSetupException, SimulatorShutdownException

Get one of the simulator outputs by name.

Parameters:output (str) – The name of the output to retrieve.
Returns:The value (of arbitrary type, dependent on which output), or None if the variable is not found.
Raises:SimulatorNotSetupException – if the system has a status where outputs can’t be retrieved

Get the last simulator object setup but not

Unlike get_simulator this method will also return a simulator that has
been shutdown.
Return type:AbstractSpinnakerBase

Get the current simulator object and verify that it is not running.

Return type:AbstractSpinnakerBase
Raises:SimulatorNotSetupException, SimulatorShutdownException, SimulatorRunningException

Get the current simulator object.

Return type:AbstractSpinnakerBase
Raises:SimulatorNotSetupException, SimulatorShutdownException

Check if a simulator has been setup but not yet shut down

Should behave in the same way as check_simulator except that it returns False where check_simulator raises and exception and True when it does not

Return type:bool

The machine timestep, in microseconds

..note: If the simulator has not been setup this returns the default 1000

Return type:int

The machine timestep, in microseconds

Semantic sugar for machine_time_step() / 1000.

..note: If the simulator has not been setup this returns the default 1.0

Return type:float

The machine timesteps in a microseconds

Semantic sugar for 1000 / machine_time_step()

..note: If the simulator has not been setup this returns the default 1.0

Return type:float

Returns the path to the directory that holds all provenance files

This will be the path used by the last run call or to be used by the next run if it has not yet been called.

Raises:SimulatorNotSetupException – if the system has a status where path can’t be retrieved

Returns the path to the directory that holds all the reports for run

This will be the path used by the last run call or to be used by the next run if it has not yet been called.

Raises:SimulatorNotSetupException – if the system has a status where path can’t be retrieved

Set the current simulator object.

Parameters:new_simulator (AbstractSpinnakerBase) – The simulator to set.

Returns the path to the directory that holds all provenance files

This will be the path used by the last run call or to be used by the next run if it has not yet been called.

Raises:SimulatorNotSetupException – if the system has a status where path can’t be retrieved

The time scaling factor.

Return type:int
Raises:ValueError – if the system is in a state where machine_timestep can’t be retrieved

Removes the link to the previous simulator and clears injection

spinn_front_end_common.utilities.helpful_functions module


Translate a string list of cores into a core subset

Parameters:cores (str or None) – string representing down cores formatted as x,y,p[:x,y,p]*
Return type:CoreSubsets

Convert between a time diff and total milliseconds.

Parameters:sample (timedelta) –
Returns:total milliseconds
Return type:float
spinn_front_end_common.utilities.helpful_functions.convert_vertices_to_core_subset(vertices, placements)[source]

Converts vertices into core subsets.

  • vertices (iterable(MachineVertex)) – the vertices to convert to core subsets
  • placements (Placements) – the placements object

the CoreSubSets of the vertices

Return type:


spinn_front_end_common.utilities.helpful_functions.determine_flow_states(executable_types, no_sync_changes)[source]

Get the start and end states for these executable types.

  • executable_types (dict(ExecutableType,any)) – the execute types to locate start and end states from
  • no_sync_changes (int) – the number of times sync signals been sent

dict of executable type to states.

Return type:

tuple(dict(ExecutableType,CPUState), dict(ExecutableType,CPUState))

spinn_front_end_common.utilities.helpful_functions.flood_fill_binary_to_spinnaker(executable_targets, binary, txrx, app_id)[source]

Flood fills a binary to spinnaker on a given app_id given the executable targets and binary.

  • executable_targets (ExecutableTargets) – the executable targets object
  • binary (str) – the (name of the) binary to flood fill
  • txrx (Transceiver) – spinnman instance
  • app_id (int) – the application ID to load it as

the number of cores it was loaded onto

Return type:


spinn_front_end_common.utilities.helpful_functions.generate_unique_folder_name(folder, filename, extension)[source]

Generate a unique file name with a given extension in a given folder

  • folder (str) – where to put this unique file
  • filename (str) – the name of the first part of the file without extension
  • extension (str) – extension of the file

file path with a unique addition

Return type:



Hack to support the source requirement for the router compressor on chip.

Parameters:entry (MulticastRoutingEntry) – the multicast router table entry.
Returns:return the source value
Return type:int
spinn_front_end_common.utilities.helpful_functions.get_ethernet_chip(machine, board_address)[source]

Locate the chip with the given board IP address

  • machine (Machine) – the SpiNNaker machine
  • board_address (str) – the board address to locate the chip of.

The chip that supports that board address

Return type:



ConfigurationException – when that board address has no chip associated with it

spinn_front_end_common.utilities.helpful_functions.locate_extra_monitor_mc_receiver(machine, placement_x, placement_y, packet_gather_cores_to_ethernet_connection_map)[source]

Get the data speed up gatherer that can be used to talk to a particular chip. This will be on the same board.

Return type:


spinn_front_end_common.utilities.helpful_functions.locate_memory_region_for_placement(placement, region, transceiver)[source]

Get the address of a region for a placement.

  • region (int) – the region to locate the base address of
  • placement (Placement) – the placement object to get the region address of
  • transceiver (Transceiver) – the python interface to the SpiNNaker machine

the address

Return type:



Manages a precompiled cache of structs for parsing blocks of words. Thus, this:

data = n_word_struct(n_words).unpack(data_blob)

Is much like doing this:

data = struct.unpack("<{}I".format(n_words), data_blob)

except quite a bit more efficient because things are shared including the cost of parsing the format.

Parameters:n_words (int) – The number of SpiNNaker words to be handled.
Returns:A struct for working with that many words.
Return type:Struct
spinn_front_end_common.utilities.helpful_functions.read_data(x, y, address, length, data_format, transceiver)[source]

Reads and converts a single data item from memory.

  • x (int) – chip x
  • y (int) – chip y
  • address (int) – base address of the SDRAM chip to read
  • length (int) – length to read
  • data_format (str) – the format to read memory (see struct.pack())
  • transceiver (Transceiver) – the SpinnMan interface
spinn_front_end_common.utilities.helpful_functions.write_address_to_user0(txrx, x, y, p, address)[source]

Writes the given address into the user_0 register of the given core.

  • txrx (Transceiver) – The transceiver.
  • x (int) – Chip coordinate.
  • y (int) – Chip coordinate.
  • p (int) – Core ID on chip.
  • address (int) – Value to write (32-bit integer)

spinn_front_end_common.utilities.system_control_logic module

spinn_front_end_common.utilities.system_control_logic.run_system_application(executable_cores, app_id, transceiver, provenance_file_path, executable_finder, read_algorithm_iobuf, check_for_success_function, cpu_end_states, needs_sync_barrier, filename_template, binaries_to_track=None, progress_bar=None, logger=None)[source]

Executes the given _system_ application. Used for on-chip expanders, compressors, etc.

  • executable_cores (ExecutableTargets) – the cores to run the executable on
  • app_id (int) – the app-id for the executable
  • transceiver (Transceiver) – the SpiNNMan instance
  • provenance_file_path (str) – the path for where provenance data is stored
  • executable_finder (ExecutableFinder) – finder for executable paths
  • read_algorithm_iobuf (bool) – whether to report IOBUFs
  • check_for_success_function (callable) – function used to check success; expects executable_cores, transceiver as inputs
  • cpu_end_states (set(CPUState)) – the states that a successful run is expected to terminate in
  • needs_sync_barrier (bool) – whether a sync barrier is needed
  • filename_template (str) – the IOBUF filename template.
  • binaries_to_track (list(str)) – A list of binary names to check for exit state. Or None for all binaries
  • progress_bar (ProgressBar or None) – Possible progress bar to update. end() will be called after state checked
  • logger (Logger) – If provided and IOBUF is extracted, will be used to log errors and warnings

SpinnmanException – If one should arise from the underlying SpiNNMan calls

Module contents

class spinn_front_end_common.utilities.IOBufExtractor(transceiver, executable_targets, executable_finder, app_provenance_file_path, system_provenance_file_path, recovery_mode=False, filename_template='iobuf_for_chip_{}_{}_processor_id_{}.txt', suppress_progress=False)[source]

Bases: object

Extract the logging output buffers from the machine, and separates lines based on their prefix.


Perform the extraction of IOBUF

Returns:error_entries, warn_entries
Return type:tuple(list(str),list(str))