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Benchmark buffer pinning: You know benchmark code, implemented a few functions that can be use in postgres queries, and a python script that runs them and produces CSV files and SVG plots for the current build. 2. Refactoring reference counting: Before starting to change code and potentially breaking things I considered prudent to isolate it to limit the damage. This code was part of a 8k+ LOC file. 3. Using simplehash: Simply replacing the HTAB for a simplehash, and adding a new set of macros SH_ENTRY_EMPTY, SH_MAKE_EMPTY, SH_MAKE_IN_USE. To allow using the InvalidBuffer special value instead of allocating extra space for a validity flag. Here I assume that the buffer buffer sequence is independent enough from the array size, so I use the buffer as the hash key directly, omitting a hash function call. 4. Compact PrivateRefCountEntry: The original implementation used a 4-byte key and 8-byte value. Reference count uses 32 bits, and it is unreasonable to expect one backend to pin the same buffer 1 billion times. The lock mode uses 32 bits but can only assume 4 values. So I packed them in one single uint32, giving 30 bits for count and 2 bits for lock mode. This makes the entries 8-byte long, on 64-bit CPUs this represents more than a 1/3 reduction in memory. This makes the array aligned with the 64-bit words, copying one entry can be completed in one instruction, and every entry will be aligned. 5. REFCOUNT_ARRAY_ENTRIES=0: since the simplehash is basically some array lookup, it is worth trying to remove it completely and keep only the hash. For small values we would be trading a few branches for a buffer % SIZE, for the use case of prefetch where pin/unpin in a FIFO fashion, it will save an 8-entry array lookup, and some extra data moves. In addition to the patch I am including - A bash script to apply and benchmark the patches sequentially. You might have to adjust REPO_ROOT, in my case it gets it relative to the script path, that is under $REPO_ROOT/.patches/pins/. - A compare-patches.py script that can be copied to src/test/modules/test_buffer_pin to process the benchmark CSV in figures showing one metric for different patches instead of different metrics for one patch as the benchmark.py produces. - A nicely formatted post about this [2] Regards, Alexandre [1] https://www.postgresql.org/message-id/s5p7iou7pdhxhvmv4rohmskwqmr36dc4rybvwlep5yvwrjs4pa%406oxsemms5mw4 [2] https://afelipe.hashnode.dev/postgres-backend-buffer-pinning-algorithm --00000000000048da9b064c8582e1 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Hackers,

This patch addresses a perf= ormance issue pointed out=C2=A0by Andres Freund,

<= ol style=3D"box-sizing:border-box;border-width:0px;border-style:solid;margi= n:1.25em 0px;padding:0px;list-style-position:initial;max-width:100%;font-fa= mily:"Google Sans Flex",system-ui,-apple-system,"system-ui&q= uot;,"Segoe UI",sans-serif;letter-spacing:-0.252px">

  • Benchmark buffer pinning:=C2=A0You know benchmark code, impl= emented a few functions that can be use in postgres queries, and a python s= cript that runs them and produces CSV files and SVG plots for the current b= uild.

  • Refactoring reference counting:= =C2=A0Before starting to change code and potentially breaking things I cons= idered prudent to isolate it to limit the damage. This code was part of a 8= k+ LOC file.

  • Using simplehash:=C2=A0Sim= ply replacing the HTAB for a simplehash, and adding a new set of macros SH_= ENTRY_EMPTY, SH_MAKE_EMPTY, SH_MAKE_IN_USE. To allow using the InvalidBuffe= r special value instead of allocating extra space for a validity flag. Here= I assume that the buffer buffer sequence is independent enough from the ar= ray size, so I use the buffer as the hash key directly, omitting a hash fun= ction call.

  • Compact PrivateRefCountEntry:=C2=A0The original implementation used a 4-byte key and 8-byte value. Re= ference count uses 32 bits, and it is unreasonable to expect one backend to= pin the same buffer 1 billion times. The lock mode uses 32 bits but can on= ly assume 4 values. So I packed them in one single uint32, giving 30 bits f= or count and 2 bits for lock mode. This makes the entries 8-byte long, on 6= 4-bit CPUs this represents more than a 1/3 reduction in memory. This makes = the array aligned with the 64-bit words, copying one entry can be completed= in one instruction, and every entry will be aligned.

  • REFCOUNT_ARRAY_ENTRIES=3D0:=C2=A0since the simplehash is bas= ically some array lookup, it is worth trying to remove it completely and ke= ep only the hash. For small values we would be trading a few branches for a= buffer % SIZE, for the use case of prefetch where pin/unpin in a FIFO fash= ion, it will save an 8-entry array lookup, and some extra data moves.

    • In addition to the patch I am including=C2=A0
    =
    - A bash script to apply and benchmark the patches sequentia= lly. You might have to adjust REPO_ROOT, in my case it gets it relative to = the script path, that is under $REPO_ROOT/.patches/pins/.
    - A com= pare-patches.py script that can be copied to src/test/modules/test_buffer_p= in to process the benchmark CSV in figures showing one metric for different= patches instead of different metrics for one patch as the benchmark.py pro= duces.
    - A nicely formatted post about this [2]
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