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This module provides a class,
SharedMemory, for the allocationand management of shared memory to be accessed by one or more processeson a multicore or symmetric multiprocessor (SMP) machine. To assist withthe life-cycle management of shared memory especially across distinctprocesses, a
SharedMemoryManager, is also provided in the
In this module, shared memory refers to “System V style” shared memory blocks(though is not necessarily implemented explicitly as such) and does not referto “distributed shared memory”. This style of shared memory permits distinctprocesses to potentially read and write to a common (or shared) region ofvolatile memory. Processes are conventionally limited to only have access totheir own process memory space but shared memory permits the sharingof data between processes, avoiding the need to instead send messages betweenprocesses containing that data. Sharing data directly via memory can providesignificant performance benefits compared to sharing data via disk or socketor other communications requiring the serialization/deserialization andcopying of data.
SharedMemory(name=None, create=False, size=0)¶
Creates a new shared memory block or attaches to an existing sharedmemory block. Each shared memory block is assigned a unique name.In this way, one process can create a shared memory block with aparticular name and a different process can attach to that same sharedmemory block using that same name.
As a resource for sharing data across processes, shared memory blocksmay outlive the original process that created them. When one processno longer needs access to a shared memory block that might still beneeded by other processes, the
close() method should be called.When a shared memory block is no longer needed by any process, the
unlink() method should be called to ensure proper cleanup.
name is the unique name for the requested shared memory, specified asa string. When creating a new shared memory block, if
None (thedefault) is supplied for the name, a novel name will be generated.
create controls whether a new shared memory block is created (
True)or an existing shared memory block is attached (
size specifies the requested number of bytes when creating a new sharedmemory block. Because some platforms choose to allocate chunks of memorybased upon that platform’s memory page size, the exact size of the sharedmemory block may be larger or equal to the size requested. When attachingto an existing shared memory block, the
size parameter is ignored.
Closes access to the shared memory from this instance. In order toensure proper cleanup of resources, all instances should call
close() once the instance is no longer needed. Note that calling
close() does not cause the shared memory block itself to bedestroyed.
Requests that the underlying shared memory block be destroyed. Inorder to ensure proper cleanup of resources,
unlink() should becalled once (and only once) across all processes which have needfor the shared memory block. After requesting its destruction, ashared memory block may or may not be immediately destroyed andthis behavior may differ across platforms. Attempts to access datainside the shared memory block after
unlink() has been called mayresult in memory access errors. Note: the last process relinquishingits hold on a shared memory block may call
close() in either order.
A memoryview of contents of the shared memory block.
Read-only access to the unique name of the shared memory block.
Read-only access to size in bytes of the shared memory block.
The following example demonstrates low-level use of
The following example demonstrates a practical use of the
SharedMemoryclass with NumPy arrays, accessing thesame
numpy.ndarray from two distinct Python shells:
A subclass of
BaseManager which can beused for the management of shared memory blocks across processes.
A call to
start() on a
SharedMemoryManager instance causes a new process to be started.This new process’s sole purpose is to manage the life cycleof all shared memory blocks created through it. To trigger the releaseof all shared memory blocks managed by that process, call
shutdown() on the instance.This triggers a
SharedMemory.unlink() call on all of the
SharedMemory objects managed by that process and thenstops the process itself. By creating
SharedMemory instancesthrough a
SharedMemoryManager, we avoid the need to manually trackand trigger the freeing of shared memory resources.
This class provides methods for creating and returning
SharedMemoryinstances and for creating a list-like object (
ShareableList)backed by shared memory.
multiprocessing.managers.BaseManager for a descriptionof the inherited address and authkey optional input arguments and howthey may be used to connect to an existing
SharedMemoryManager servicefrom other processes.
Create and return a new
SharedMemory object with thespecified
size in bytes.
Create and return a new
ShareableList object, initializedby the values from the input
The following example demonstrates the basic mechanisms of a
The following example depicts a potentially more convenient pattern for using
SharedMemoryManager objects via the
with statement toensure that all shared memory blocks are released after they are no longerneeded:
When using a
SharedMemoryManager in a
with statement, theshared memory blocks created using that manager are all released when the
with statement’s code block finishes execution.
ShareableList(sequence=None, *, name=None)¶
Provides a mutable list-like object where all values stored within arestored in a shared memory block. This constrains storable values toonly the
str (less than 10M bytes each),
bytes (less than 10M bytes each), and
None built-in data types.It also notably differs from the built-in
list type in that theselists can not change their overall length (i.e. no append, insert, etc.)and do not support the dynamic creation of new
ShareableListinstances via slicing.
sequence is used in populating a new
ShareableList full of values.Set to
None to instead attach to an already existing
ShareableList by its unique shared memory name.
name is the unique name for the requested shared memory, as describedin the definition for
SharedMemory. When attaching to anexisting
ShareableList, specify its shared memory block’s uniquename while leaving
sequence set to
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Returns the number of occurrences of
Returns first index position of
value is not present.
Read-only attribute containing the
struct packing format used byall currently stored values.
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SharedMemory instance where the values are stored.
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The following example demonstrates basic use of a
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The following example depicts how one, two, or many processes may access thesame
ShareableList by supplying the name of the shared memory blockbehind it: