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Well, one of my friends drop me one formula. Let x to be the rate of GC time out of total running time, and we can get

(1-2x) * 14 = 1- x => x = 13/27

which means now ruby spends 13/27 time on GC, fast enough? (before patch, it spends 26/27 time on GC, really bad)



I don't see how you're getting this formula, but if it spends 13/27 on GC after a 2x GC speedup, then it was 26/40 before, not 26/27.




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