Thread

Re: Proposal : Use bump memory context for temp buffers

Heikki Linnakangas <hlinnaka@iki.fi> — 2025-12-16T13:51:14Z

On 16/12/2025 15:05, Daniil Davydov wrote:
> Hi,
> 
> Commit [1] introduced a new memory context suitable for situations when we
> should allocate a large amount of memory with no need to free or reallocate it.
> 
> 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).
> 
> Thus, the use case for temp buffers seems to perfectly fit for bump
> memory context.
> What do you think?

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.

- Heikki