Horton

Re: [PoC] Improve dead tuple storage for lazy vacuum

Masahiko Sawada <sawada.mshk@gmail.com>

View thread View on postgr.es
From: Masahiko Sawada <sawada.mshk@gmail.com>
To: John Naylor <john.naylor@enterprisedb.com>
Cc: Nathan Bossart <nathandbossart@gmail.com>, Andres Freund <andres@anarazel.de>, Matthias van de Meent <boekewurm+postgres@gmail.com>, Yura Sokolov <y.sokolov@postgrespro.ru>, PostgreSQL-development <pgsql-hackers@postgresql.org>
Date: 2023-02-10T07:15:46Z
Lists: pgsql-hackers

Attachments

On Fri, Feb 10, 2023 at 3:51 PM John Naylor
<john.naylor@enterprisedb.com> wrote:
>
>
> On Thu, Feb 9, 2023 at 2:08 PM Masahiko Sawada <sawada.mshk@gmail.com> wrote:
> >
> > query: select * from bench_tidstore_load(0, 10 * 1000 * 1000)
> >
> > v15:
> >  load_ms
> > ---------
> >      816
>
> How did you build the tid store and test on v15? I first tried to apply v15-0009-PoC-lazy-vacuum-integration.patch, which conflicts with vacuum now, so reset all that, but still getting build errors because the tid store types and functions have changed.

I applied v26-0008-Add-TIDStore-to-store-sets-of-TIDs-ItemPointerDa.patch
on top of v15 radix tree and changed the TidStore so that it uses v15
(non-templated) radixtree. That way, we can test TidStore using v15
radix tree. I've attached the patch that I applied on top of
v26-0008-Add-TIDStore-to-store-sets-of-TIDs-ItemPointerDa.patch.

Regards,

--
Masahiko Sawada
Amazon Web Services: https://aws.amazon.com

Commits

  1. radixtree: Fix SIGSEGV at update of embeddable value to non-embeddable.

  2. Get rid of anonymous struct

  3. Teach radix tree to embed values at runtime

  4. Teach TID store to skip bitmap for small numbers of offsets

  5. Use bump context for TID bitmaps stored by vacuum

  6. Fix alignment of stack variable

  7. Use TidStore for dead tuple TIDs storage during lazy vacuum.

  8. Rethink create and attach APIs of shared TidStore.

  9. Fix inconsistent function prototypes with function definitions.

  10. Fix a calculation in TidStoreCreate().

  11. Fix potential integer handling issue in radixtree.h.

  12. Add TIDStore, to store sets of TIDs (ItemPointerData) efficiently.

  13. Fix link error for test_radixtree module on Windows

  14. Blind attempt to fix ODR violations

  15. Fix incorrect format specifier for int64

  16. Fix redefinition of typedefs

  17. Add template for adaptive radix tree

  18. Fix signedness error in 9f225e992 for gcc

  19. Introduce helper SIMD functions for small byte arrays

  20. Optimize vacuuming of relations with no indexes.

  21. Add bound check before bsearch() for performance

  22. Allocate consecutive blocks during parallel seqscans