Fix high frag in gen2 #48601
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Fix high frag in gen2 #48601
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…n when gen 2 fragmentation becomes too high. Details: - New config setting GCConserveMemory with values between 0 and 9 - intuitively, the higher the value, the more GC tries to keep gen 2 compact. - Implementation: the config value is considered in dt_high_frag_p as the desired percentage*10 of useful data in gen 2. In other words, 100 - config value*10 is the fragmentation threshold above which a blocking gen 2 is performed.
This was referenced Mar 11, 2021
…o make the compaction decision. Also, only do the computations only for gen 1 GCs to cut down on the back-to-back gen 2 GCs that we were observing.
This was referenced Mar 22, 2021
…mbined fragmentation in gen 2 + loh, rather than just the fragmentation in loh.
…ACE_GC and removed debugging code.
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Details:
Initial perf data suggest this does have the desired effect of trimming down average gen 2 size (and especially trimming it down when the survivorship in gen 2 goes down). There was also the expected effect of larger GC pause times, and an unexpected effect of larger LOH sizes, probably because we also trigger fewer gen 2 collections.