Dmitry, I mean Chugunov, but I have questioned him. His answer was the A. Goncharuk should now the answer.
On Wed, Jun 27, 2018 at 2:58 PM, Dmitry Pavlov <dpavlov....@gmail.com> wrote: > John, is this question still actual? > > пт, 22 июн. 2018 г. в 15:18, Dmitry Pavlov <dpavlov....@gmail.com>: > > > 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 > >> > > >> > > >
