RE: Changing shared_buffers without restart

Jack Ng <jack.ng@huawei.com>

From: Jack Ng <Jack.Ng@huawei.com>

To: Ashutosh Bapat <ashutosh.bapat.oss@gmail.com>

Cc: Dmitry Dolgov <9erthalion6@gmail.com>, "pgsql-hackers@postgresql.org" <pgsql-hackers@postgresql.org>, Robert Haas <robertmhaas@gmail.com>, Ni Ku <jakkuniku@gmail.com>

Date: 2025-05-13T05:03:03Z

Lists: pgsql-hackers

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

Remove PG_MMAP_FLAGS from mem.h
- c100340729b6 19 (unreleased) landed
Improve runtime and output of tests for replication slots checkpointing.
- 4464fddf7b50 18.0 cited
Revert support for improved tracking of nested queries
- f85f6ab051b7 18.0 cited
Use exported symbols list on macOS for loadable modules as well
- 3feff3916ee1 18.0 cited
Add support for basic NUMA awareness
- 65c298f61fc7 18.0 cited
Avoid unnecessary copying of a string in pg_restore.c
- 5e1915439085 18.0 cited
aio: Infrastructure for io_method=worker
- 55b454d0e140 18.0 cited
Improve InitShmemAccess() prototype
- 2a7b2d97171d 18.0 landed

Attachments

test_hugepage_mappings.c (text/plain)

Hi Ashutosh,

> > * During resize, simply calculate the new size and call ftruncate on each
> > segment to adjust memory accordingly, no need to mmap/munmap or modify any
> > memory mapping.
> >
> >
> That's same as my understanding.
Great, thanks for confirming!

> I thought I had shared a test program upthread, but I don't find it now. Attached here. Can you please share your test program?
Sure, mine is attached here (it’s based on another test program you shared before :-)

Regards,

Jack Ng