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67 lines
2.2 KiB
67 lines
2.2 KiB
4 years ago
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:mod:`gc` -- control the garbage collector
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==========================================
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.. module:: gc
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:synopsis: control the garbage collector
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|see_cpython_module| :mod:`python:gc`.
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Functions
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---------
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.. function:: enable()
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Enable automatic garbage collection.
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.. function:: disable()
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Disable automatic garbage collection. Heap memory can still be allocated,
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and garbage collection can still be initiated manually using :meth:`gc.collect`.
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.. function:: collect()
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Run a garbage collection.
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.. function:: mem_alloc()
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Return the number of bytes of heap RAM that are allocated.
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.. admonition:: Difference to CPython
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:class: attention
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This function is MicroPython extension.
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.. function:: mem_free()
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Return the number of bytes of available heap RAM, or -1 if this amount
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is not known.
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.. admonition:: Difference to CPython
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:class: attention
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This function is MicroPython extension.
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.. function:: threshold([amount])
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Set or query the additional GC allocation threshold. Normally, a collection
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is triggered only when a new allocation cannot be satisfied, i.e. on an
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out-of-memory (OOM) condition. If this function is called, in addition to
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OOM, a collection will be triggered each time after *amount* bytes have been
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allocated (in total, since the previous time such an amount of bytes
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have been allocated). *amount* is usually specified as less than the
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full heap size, with the intention to trigger a collection earlier than when the
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heap becomes exhausted, and in the hope that an early collection will prevent
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excessive memory fragmentation. This is a heuristic measure, the effect
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of which will vary from application to application, as well as
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the optimal value of the *amount* parameter.
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Calling the function without argument will return the current value of
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the threshold. A value of -1 means a disabled allocation threshold.
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.. admonition:: Difference to CPython
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:class: attention
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This function is a MicroPython extension. CPython has a similar
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function - ``set_threshold()``, but due to different GC
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implementations, its signature and semantics are different.
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