RFR: Optimize ShMatrix::clear_(in|out)bound

[Roman Kennke]

Ok

Am 28. März 2017 20:53:10 MESZ schrieb Aleksey Shipilev <shade at redhat.com>:
>We know from sore experience that these methods are slow, and they are
>called in
>our critical paused phases in experimental partial and update-ref code.
>It makes
>sense to optimize it:
>http://cr.openjdk.java.net/~shade/shenandoah/matrix-clear-inoutbound/webrev.01/
>
>Improves update-refs:
>
>[56.765s][info][gc,stats] Pause Post Update References =
>   0.11 s (a = 18277 us) (n =     6)
>     (lvls, us =    16602,    16602,    16992,    19141,    20516)
>
>[56.784s][info][gc,stats] Pause Post Update References =
>   0.04 s (a = 6097 us) (n =     6)
>     (lvls, us =     5488,     5488,     5723,     6309,     6958)
>
>Improves partial:
>
>[56.887s][info][gc,stats] Partial GC =
>   2.75 s (a =    58532 us) (n =    47)
>     (lvls, us =    48242,    49219,    50195,    58594,   154002)
>
>[56.911s][info][gc,stats] Partial GC =
>   2.63 s (a =    55895 us) (n =    47)
>     (lvls, us =    45117,    46484,    47656,    58742,   149117)
>
>
>-Aleksey

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