public inbox for [email protected]
help / color / mirror / Atom feedFrom: Christoph Berg <[email protected]>
To: Andres Freund <[email protected]>
Cc: Tomas Vondra <[email protected]>
Cc: [email protected]
Subject: Re: pgsql: Introduce pg_shmem_allocations_numa view
Date: Mon, 23 Jun 2025 21:57:56 +0200
Message-ID: <[email protected]> (raw)
In-Reply-To: <kl4zd72eeaex7zcicpuvpsuslrs5nfvmab7xzt4jnvcjvd6mxw@tcp64c55qkpj>
References: <[email protected]>
<[email protected]>
<[email protected]>
<[email protected]>
<g3mywoeo7jmh6rci7epx2ishowgz65q2j7ek3c5f3lxcmvuktg@ler2fsv4szmn>
<[email protected]>
<[email protected]>
<kl4zd72eeaex7zcicpuvpsuslrs5nfvmab7xzt4jnvcjvd6mxw@tcp64c55qkpj>
Re: Andres Freund
> How confident are we that this isn't actually because we passed a bogus
> address to the kernel or such? With this patch, are *any* pages recognized as
> valid on the machines that triggered the error?
See upthread - the first 35 pages were ok, then a lot of -14.
> I wonder if we ought to report the failures as a separate "numa node"
> (e.g. NULL as node id) instead ...
Did that now, using N+1 (== 1 here) for errors in this Debian i386
environment (chroot on an amd64 host):
select * from pg_shmem_allocations_numa \crosstabview
name │ 0 │ 1
────────────────────────────────────────────────┼──────────┼──────────
multixact_offset │ 69632 │ 65536
subtransaction │ 139264 │ 131072
notify │ 139264 │ 0
Shared Memory Stats │ 188416 │ 131072
serializable │ 188416 │ 86016
PROCLOCK hash │ 4096 │ 0
FinishedSerializableTransactions │ 4096 │ 0
XLOG Ctl │ 2117632 │ 2097152
Shared MultiXact State │ 4096 │ 0
Proc Header │ 4096 │ 0
Archiver Data │ 4096 │ 0
.... more 0s in the last column ...
AioHandleData │ 1429504 │ 0
Buffer Blocks │ 67117056 │ 67108864
Buffer IO Condition Variables │ 266240 │ 0
Proc Array │ 4096 │ 0
.... more 0s
(73 rows)
There is something fishy with pg_buffercache. If I restart PG, I'm
getting "Bad address" (errno 14), this time as return value of
move_pages().
postgres =# select * from pg_buffercache_numa;
DEBUG: 00000: NUMA: NBuffers=16384 os_page_count=32768 os_page_size=4096
LOCATION: pg_buffercache_numa_pages, pg_buffercache_pages.c:383
2025-06-23 19:41:41.315 UTC [1331894] ERROR: failed NUMA pages inquiry: Bad address
2025-06-23 19:41:41.315 UTC [1331894] STATEMENT: select * from pg_buffercache_numa;
ERROR: XX000: failed NUMA pages inquiry: Bad address
LOCATION: pg_buffercache_numa_pages, pg_buffercache_pages.c:394
Repeated calls are fine.
Maybe NUMA is just not supported on 32-bit archs, but I'd rather be
sure about that before play that card.
Christoph
view thread (83+ messages) latest in thread
reply
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: [email protected]
Cc: [email protected], [email protected], [email protected], [email protected]
Subject: Re: pgsql: Introduce pg_shmem_allocations_numa view
In-Reply-To: <[email protected]>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by agora; see mirroring instructions
for how to clone and mirror all data and code used for this inbox