postgres-github.git / summary / log / commit / refs

commit    cceb1bf45e3a12a859c1453bd53925b95d1b0cf1
Author:   Andres Freund <andres@anarazel.de>
Date:     Wed Apr 01 23:22:44 2026 +0000

    read_stream: Issue IO synchronously while in fast path
    
    While in fast-path, execute any IO that we might encounter synchronously.
    Because we are, in that moment, not reading ahead, dispatching any occasional
    IO to workers has the dispatch overhead, without any realistic chance of the
    IO completing before we need it.
    
    This helps io_method=worker performance for workloads that have only
    occasional cache misses, but where those occasional misses still take long
    enough to matter.  It is likely this is only measurable with fast local
    storage or workloads with the data in the kernel page cache, as with remote
    storage the IO latency, not the dispatch-to-worker latency, is the determining
    factor.
    
    Reviewed-by: Melanie Plageman <melanieplageman@gmail.com>
    Reviewed-by: Nazir Bilal Yavuz <byavuz81@gmail.com>
    Discussion: https://postgr.es/m/f3xxfrkafjxpyqxywcxricxgyizjirfceychyxsgn7bwjp5eda@kwbduhy7tfmu
    Discussion: https://postgr.es/m/CAH2-Wz%3DkMg3PNay96cHMT0LFwtxP-cQSRZTZzh1Cixxf8G%3Dzrw%40mail.gmail.com

[parent: 1bdbb211bbf3]