Hi Ed, Which Sergey do you mean? I know a number of contributors.
Sincerely, вт, 19 июн. 2018 г. в 22:15, Eduard Shangareev <eduard.shangar...@gmail.com >: > Hi, > > 1. It looks weird, yeah. Need to ask Sergey, who has changed it last time. > > 2. Because we could reuse memory. For example, after cache destroy or > something like that. > > On Tue, Jun 19, 2018 at 9:58 PM, John Wilson <sami.hailu...@gmail.com> > wrote: > > > Hi, > > > > Two quick questions: > > > > > > 1. The design documentation here, > > https://cwiki.apache.org/confluence/display/IGNITE/ > > Ignite+Durable+Memory+-+under+the+hood, > > states that the default segment count is equal to the number of > logical > > cores available in the underlying machine. However, the segments array > > in > > PageMemory indicates that the maximum number of segments is: 1 << > > SEG_BITS. > > Since SEG_BITS = 4, the max # segments is 16. Did I miss something > here? > > 2. Reading the code in PageMemoryNoStoreImp, it looks like pages are > > allocated segment sequentially in a bump-the-pointer strategy where > the > > first 8 bytes of a segment hold a pointer to the index of the last > > allocated page. If this is true, then I don't understand the point of > > having a page map buckets. Why not use a simple arithmetic index * > > pageSize > > to get the offset of a page? > > > > Thanks. > > John > > >
