Horton

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

Masahiko Sawada <sawada.mshk@gmail.com>

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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: 2023-04-17T15:20:16Z
Lists: pgsql-hackers

Attachments

On Sat, Mar 11, 2023 at 12:26 AM Masahiko Sawada <sawada.mshk@gmail.com> wrote:
>
> On Fri, Mar 10, 2023 at 11:30 PM Masahiko Sawada <sawada.mshk@gmail.com> wrote:
> >
> > On Fri, Mar 10, 2023 at 3:42 PM John Naylor
> > <john.naylor@enterprisedb.com> wrote:
> > >
> > > On Thu, Mar 9, 2023 at 1:51 PM Masahiko Sawada <sawada.mshk@gmail.com> wrote:
> > >
> > > > I've attached the new version patches. I merged improvements and fixes
> > > > I did in the v29 patch.
> > >
> > > I haven't yet had a chance to look at those closely, since I've had to devote time to other commitments. I remember I wasn't particularly impressed that v29-0008 mixed my requested name-casing changes with a bunch of other random things. Separating those out would be an obvious way to make it easier for me to look at, whenever I can get back to this. I need to look at the iteration changes as well, in addition to testing memory measurement (thanks for the new results, they look encouraging).
> >
> > Okay, I'll separate them again.
>
> Attached new patch series. In addition to separate them again, I've
> fixed a conflict with HEAD.
>

I've attached updated version patches to make cfbot happy. Also, I've
splitted fixup patches further(from 0007 except for 0016 and 0018) to
make reviews easy. These patches have the prefix radix tree, tidstore,
and vacuum, indicating the part it changes. 0016 patch is to change
DSA so that we can specify both the initial and max segment size and
0017 makes use of it in vacuumparallel.c I'm still researching a
better solution for memory limitation but it's the best solution for
me for now.

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