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Garbage collector configuration
===============================

.. _minimark-environment-variables:

Minimark
--------

PyPy's default ``minimark`` garbage collector is configurable through
several environment variables:

``PYPY_GC_NURSERY``
    The nursery size.
    Defaults to ``4MB``.
    Small values (like 1 or 1KB) are useful for debugging.

``PYPY_GC_MAJOR_COLLECT``
    Major collection memory factor.
    Default is ``1.82``, which means trigger a major collection when the
    memory consumed equals 1.82 times the memory really used at the end
    of the previous major collection.

``PYPY_GC_GROWTH``
    Major collection threshold's max growth rate.
    Default is ``1.4``.
    Useful to collect more often than normally on sudden memory growth,
    e.g. when there is a temporary peak in memory usage.

``PYPY_GC_MAX``
    The max heap size.
    If coming near this limit, it will first collect more often, then
    raise an RPython MemoryError, and if that is not enough, crash the
    program with a fatal error.
    Try values like ``1.6GB``.

``PYPY_GC_MAX_DELTA``
    The major collection threshold will never be set to more than
    ``PYPY_GC_MAX_DELTA`` the amount really used after a collection.
    Defaults to 1/8th of the total RAM size (which is constrained to be
    at most 2/3/4GB on 32-bit systems).
    Try values like ``200MB``.

``PYPY_GC_MIN``
    Don't collect while the memory size is below this limit.
    Useful to avoid spending all the time in the GC in very small
    programs.
    Defaults to 8 times the nursery.

``PYPY_GC_DEBUG``
    Enable extra checks around collections that are too slow for normal
    use.
    Values are ``0`` (off), ``1`` (on major collections) or ``2`` (also
    on minor collections).