ysr1729 at gmail.com
Thu Feb 9 16:47:32 UTC 2012
Thanks Jon for the informative response!
On Thu, Feb 9, 2012 at 6:39 AM, Jon Masamitsu <jon.masamitsu at oracle.com>wrote:
> I cannot say that I would recommend it's use. The problem with
> is all in the policy that it uses to decide how to move the boundary. It
> used to sometimes
> back itself into a corner (young gen size and old gen size which was sub
> and not be able to get itself out. I think that can still be a problem
> but perhaps the
> bigger problem is that the policy thinks that it is optimal to divide the
> the GC times
> evenly between the young GC's and old GC's and that is not always the
> case. In
> general that policy produces reasonably good results but when that policy
> drive the moving of the boundary, I've seen cases where there are
> regressions (i.e., GC ergonomics turned on but worse performance when the
> boundary moving is additionally turned on).
> On 2/7/2012 9:04 AM, Srinivas Ramakrishna wrote:
>> Hi Jon, John, et al. --
>> What's the current status of and experience with UseAdaptiveGCBoundary?
>> As I recall a (long) while ago there was some performance issue with it,
>> I can't recall the specific details.
>> Is this flag something you recommend trying out? Are there performance
>> sharp-corners that one should watch out for if one were to enable this
>> feature ?
>> thanks for any tips!
>> -- ramki
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