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help / color / mirror / Atom feedFrom: ywgrit <[email protected]>
To: [email protected]
Cc: [email protected]
Subject: Some questions about JIT optimization
Date: Mon, 26 Jan 2026 11:11:22 +0800
Message-ID: <CAPt2h2aWf7QPg81+Wq78Z-88ybHvSKefoSXMidiFpgMbJZJvMg@mail.gmail.com> (raw)
Presentation:
https://anarazel.de/talks/2018-06-01-pgcon-state-of-jit/state-of-jit.pdf.
It mentions “Future things to JIT: Aggregate & Hashjoin hash computation.”
I'm not entirely clear where this optimization specifically manifests. I
tested tpch-100G. Performance improvements for q5/11 were minimal because
expression execution constitutes a very small proportion in these two
queries, leaving little room for JIT optimization. Both queries share
common hot functions: `ExecParallelScanHashBucket` and
`ExecParallelHashJoin`. However, I don't see how these hot functions could
be optimized via JIT. I'd appreciate hearing everyone's thoughts.
Thanks.
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