Hi, On Tue, Dec 16, 2025 at 8:51 PM Heikki Linnakangas <[email protected]> wrote: > > On 16/12/2025 15:05, Daniil Davydov wrote: > > I think that it will be useful for temp buffers : > > 1) We allocate them lazily and never try to free them. > > 2) Some users are very active in working with temporary tables, and as > > a result, > > they set large values for the "temp_buffers" parameter (several gigabytes). > > It makes no difference. The bump memory context is useful if you perform > a lot of small allocations, because it skips the overhead of the chunk > headers. In LocalBufferContext, we only ever make one allocation. >
Thanks for the explanation! Actually, we allocate temp buffers gradually by memory chunks with increasing size. So if temp buffers are pretty big, we must to do about 20 allocations. I 100% agree that the amount of saved memory will be very-very low compared to the size of the temp buffers. When I wrote "perfectly fit for bump memory context" I meant design rather than the performance increasing. -- Best regards, Daniil Davydov
