On Mon, Sep 28, 2015 at 7:09 PM, Pavel Stehule <pavel.steh...@gmail.com> wrote:
> > 2015-09-28 12:37 GMT+02:00 Shulgin, Oleksandr < > oleksandr.shul...@zalando.de>: > >> >>> I didn't propose too different solution. There is only one difference - >>> sharing DSM for smaller data. It is similar to using usual shared memory. >>> >> >> Does this mean implementing some sort of allocator on top of the shared >> memory segment? If so, how are you going to prevent fragmentation? >> > > yes, simple memory allocator is necessary in this case. But it should be > really simple - you can allocate only fixed size blocks - 10KB, 100KB and > 1MB from separate buffers. So the fragmentation is not possible. > Maybe we're talking about completely different ideas, but I don't see how fixing the block helps to fight fragmentation, in particular. Can you sketch a simple example? E.g. 400 backends share the common segment and all of them want to publish a plan of ~1kb, for example. Now what? -- Alex
