Excellent - thank you… On May 16, 2014, at 7:08 AM, Samuel CARRIERE <samuel.carri...@urssaf.fr> wrote:
> Hi, > This is arena allocation of memtables. See here for more infos : > http://www.datastax.com/dev/blog/whats-new-in-cassandra-1-0-performance > > > > > De : graham sanderson <gra...@vast.com> > A : dev@cassandra.apache.org, > Date : 16/05/2014 14:03 > Objet : Things that are about 1M big > > > > So just throwing this out there for those for whom this might ring a bell. > > I?m debugging some CMS memory fragmentation issues on 2.0.5 - and > interestingly enough most of the objects giving us promotion failures are > of size 131074 (dwords) - GC logging obviously doesn?t say what those are, > but I?d wager money they are either 1M big byte arrays, or less likely > 256k entry object arrays backing large maps > > So not strictly critical to solving my problem, but I was wondering if > anyone can think of any heap allocated C* objects which are (with no > significant changes to standard cassandra config) allocated in 1M chunks. > (It would save me scouring the code, or a 9 gig heap dump if I need to > figure it out!) > > Thanks, > > Graham
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