"enabled" : int | If this is 1 then the gc is enabled as usual. If it's 0 then all
automatically scheduled gc runs are disabled and the parameters
below have no effect, but explicit runs through the gc
function still works as usual. If it's -1 then the gc is
completely disabled so that even explicit gc calls won't do
anything.
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"garbage_ratio_low" : float | As long as the gc time is less than gc_time_ratio, aim to run
the gc approximately every time the ratio between the garbage
and the total amount of allocated things is this.
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"time_ratio" : float | When more than this fraction of the cpu time is spent in the gc,
aim for gc_garbage_ratio_high instead of gc_garbage_ratio_low.
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"garbage_ratio_high" : float | Upper limit for the garbage ratio - run the gc as often as it
takes to keep it below this.
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"average_slowness" : float | When predicting the next gc interval, use a decaying average
with this slowness factor. It should be a value between 0.0 and
1.0 that specifies the weight to give to the old average value.
The remaining weight up to 1.0 is given to the last reading.
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