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Re: lockup in parallel hash join on dikkop (freebsd 14.0-current) - Mailing list pgsql-hackers

From Robert Haas
Subject Re: lockup in parallel hash join on dikkop (freebsd 14.0-current)
Date
Msg-id CA+TgmoY61uExKGTxA_gRFAr-yiXfWd=1u7_SB0t2eZ9oa8QRxQ@mail.gmail.com
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In response to Re: lockup in parallel hash join on dikkop (freebsd 14.0-current)  (Alexander Lakhin <exclusion@gmail.com>)
Responses Re: lockup in parallel hash join on dikkop (freebsd 14.0-current)
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On Fri, Sep 1, 2023 at 6:13 AM Alexander Lakhin <exclusion@gmail.com> wrote:
> (Placing "pg_compiler_barrier();" just after "waiting = true;" fixed the
> issue for us.)

Maybe it'd be worth trying something stronger, like
pg_memory_barrier(). A compiler barrier doesn't prevent the CPU from
reordering loads and stores as it goes, and ARM64 has weak memory
ordering.

--
Robert Haas
EDB: http://www.enterprisedb.com

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