RFR (S): 8155229: Tune thread usage for live data clearing
thomas.schatzl at oracle.com
Thu Apr 28 11:16:02 UTC 2016
during testing of 8077144 I found that live bitmap clear can be
significantly sped up by not using that many threads.
A good conservative estimate (tends to use too many threads) that still
cuts mark bitmap clear time by >50% is to give each thread at least 1
MB of data to clear.
jprt, webrev, various performance tests
Depends on 8155232.
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