Hi Jenny, On Fri, Oct 7, 2016 at 11:52 AM, yu.zh...@oracle.com <yu.zh...@oracle.com> wrote:
> Prasanna, > > In addition to what Vitaly said, I have some comments about your question: > > 1) Humongus allocation request for 72 mb failed, from the logs we > can also see we have free space of around 3 GB. Does this means , our > application is encountering high amount of fragmentation ?. > > It is possible. What it means is g1 can not find 36 consecutive regions > for that 72 mb object. > > I agree the ReservePercent=40 is too high, but that should not prevent > allocating to the old gen. G1 tries to honor ReservePercent. > So just to clarify - is the space (i.e. regions) reserved by G1ReservePercent allocatable to humongous object allocations? All docs/webpages I found talk about this space being for holding survivors (i.e. evac failure/to-space exhaustion mitigation). It sounds like you're saying these reserved regions should also be used to satisfy HO allocs? Thanks
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