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From: Imseih (AWS), Sami <[email protected]>
To: Robert Haas <[email protected]>
Cc: Andres Freund <[email protected]>
Cc: Nathan Bossart <[email protected]>
Cc: Peter Geoghegan <[email protected]>
Cc: Bossart, Nathan <[email protected]>
Cc: Justin Pryzby <[email protected]>
Cc: [email protected] <[email protected]>
Cc: Masahiko Sawada <[email protected]>
Subject: Re: Add index scan progress to pg_stat_progress_vacuum
Date: Wed, 6 Apr 2022 21:22:38 +0000
Message-ID: <[email protected]> (raw)
In-Reply-To: <CA+TgmoaQDGtKs8qotVBHRzr-G5OnrQNdeknAjM_GKdc0J_ideg@mail.gmail.com>
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>    At the beginning of a parallel operation, we allocate a chunk of>
>    dynamic shared memory which persists even after some or all workers
>    have exited. It's only torn down at the end of the parallel operation.
>    That seems like the appropriate place to be storing any kind of data
>    that needs to be propagated between parallel workers. The current
>    patch uses the main shared memory segment, which seems unacceptable to
>    me.

Correct, DSM does track shared data. However only participating
processes in the parallel vacuum can attach and lookup this data.

The purpose of the main shared memory is to allow a process that
Is querying the progress views to retrieve the information.

Regards,

Sami Imseih
Amazon Web Services

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