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).