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From: Nathan Bossart <[email protected]>
To: Andres Freund <[email protected]>
Cc: [email protected]
Cc: Tom Lane <[email protected]>
Cc: Alexander Lakhin <[email protected]>
Cc: Sami Imseih <[email protected]>
Cc: Bharath Rupireddy <[email protected]>
Cc: Treat <[email protected]>
Cc: [email protected]
Cc: [email protected]
Subject: Re: pgstat vs aset
Date: Thu, 9 Apr 2026 09:50:49 -0500
Message-ID: <ade8yYCKmQm26ppc@nathan> (raw)
In-Reply-To: <rtskcyc2o6rt7yebeej4byb62fnv7mcbuiodyuduqmi4ek2mnn@y5pqlz5fbsbd>
References: <rtskcyc2o6rt7yebeej4byb62fnv7mcbuiodyuduqmi4ek2mnn@y5pqlz5fbsbd>

On Wed, Apr 08, 2026 at 07:04:58PM -0400, Andres Freund wrote:
> In [1] I looked at pgstat memory usage after sort of a complaint by Nathan.
> The conversion of "PgStat Shared Ref" to slab seems like an improvement we
> obviously should make [2].
>
> [...]
> 
> But I think for this use case we actually have a more fitting memory context
> type for this workload, i.e. GenerationContext.  With that the size after the
> same vacuum is

Nice.

> [2] It's a big enough saving that I'm kinda wondering about whether we should
> try to sneak it into 19.

I don't know whether it's appropriate to try to sneak this into v19 at this
point, but it at least seems like a "moment v20 opens for development"
thing.  Should we double check there's no meaningful performance
differences?  Otherwise, this seems like an easy win.

-- 
nathan

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