> On Mar 5, 2020, at 7:51 AM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>
> Scott Ribe <scott_ribe@elevated-dev.com> writes:
>> What is POSIX shared memory used for anymore?
>
> We still allocate a small shm block as a means of counting live backends
> (since the SysV spec includes an "nattch" count but mmap'd segments do
> not provide that info). Should only be ~50 bytes though.
>
> regards, tom lane
I recreated the error so I could post it here:
ERROR 53100 (disk_full) could not resize shared memory segment "/PostgreSQL.935653392" to 1048576 bytes: No space left
ondevice
So something is using shared memory, and wants 1MB chunks. What could that be?