translation.gc

• name: gc
• description: Garbage Collection Strategy
• command-line: –gc
• option type: choice option
• possible values:
  • boehm
  • ref
  • semispace
  • statistics
  • generation
  • hybrid
  • minimark
  • incminimark
  • none
• default: ref
• requirements:
  • value ‘boehm’ requires:
    • translation.continuation to be set to ‘False’
    • translation.gctransformer to be set to ‘boehm’
  • value ‘ref’ requires:
    • translation.rweakref to be set to ‘False’
    • translation.gctransformer to be set to ‘ref’
  • value ‘semispace’ requires:
    • translation.gctransformer to be set to ‘framework’
  • value ‘statistics’ requires:
    • translation.gctransformer to be set to ‘framework’
  • value ‘generation’ requires:
    • translation.gctransformer to be set to ‘framework’
  • value ‘hybrid’ requires:
    • translation.gctransformer to be set to ‘framework’
  • value ‘minimark’ requires:
    • translation.gctransformer to be set to ‘framework’
  • value ‘incminimark’ requires:
    • translation.gctransformer to be set to ‘framework’
  • value ‘none’ requires:
    • translation.rweakref to be set to ‘False’
    • translation.gctransformer to be set to ‘none’

Choose the Garbage Collector used by the translated program. The recommended default is “incminimark”.

• “ref”: reference counting. Takes very long to translate and the result is slow. Used only for tests. Don’t use it for real RPython programs.
• “none”: no GC. Leaks everything. Don’t use it for real RPython programs: the rate of leaking is immense.
• “semispace”: a copying semi-space GC.
• “generation”: a generational GC using the semi-space GC for the older generation.
• “hybrid”: a hybrid collector of “generation” together with a mark-n-sweep old space
• “boehm”: use the Boehm conservative GC.
• “minimark”: a generational mark-n-sweep collector with good performance. Includes page marking for large arrays.
• “incminimark”: like minimark, but adds incremental major collections. Seems to come with no performance drawback over “minimark”, so it is the default. A few recent features of PyPy (like cpyext) are only working with this GC.