| From: | Greg Stark <stark(at)mit(dot)edu> |
|---|---|
| To: | Ibrar Ahmed <ibrar(dot)ahmad(at)gmail(dot)com> |
| Cc: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: VACUUM memory management |
| Date: | 2019-12-09 21:36:15 |
| Message-ID: | CAM-w4HMwc=kKhd_y1MwfNWJwWG7dsPkrt2iVQjzQb=OfAr0eZw@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Mon, 9 Dec 2019 at 14:03, Ibrar Ahmed <ibrar(dot)ahmad(at)gmail(dot)com> wrote:
> I'd
> actually argue that the segment size should be substantially smaller
> than 1 GB, like say 64MB; there are still some people running systems
> which are small enough that allocating 1 GB when we may need only 6
> bytes can drive the system into OOM."
I don't even see why you would allocated as much as 64MB. I would
think something around 1MB would be more sensible. So you might need
an array of segment pointers as long as a few thousand pointers, big
deal. We can handle repalloc on 8kB arrays pretty easily.
--
greg
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