Horton

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

John Naylor <johncnaylorls@gmail.com>

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From: John Naylor <johncnaylorls@gmail.com>
To: Masahiko Sawada <sawada.mshk@gmail.com>
Cc: PostgreSQL-development <pgsql-hackers@postgresql.org>, Nathan Bossart <nathandbossart@gmail.com>, Andres Freund <andres@anarazel.de>, Matthias van de Meent <boekewurm+postgres@gmail.com>, Yura Sokolov <y.sokolov@postgrespro.ru>
Date: 2024-03-20T06:48:10Z
Lists: pgsql-hackers 
On Thu, Mar 14, 2024 at 12:06 PM Masahiko Sawada <sawada.mshk@gmail.com> wrote:
>
> On Thu, Mar 14, 2024 at 1:29 PM John Naylor <johncnaylorls@gmail.com> wrote:
> > Locally (not CI), we should try big inputs to make sure we can
> > actually go up to many GB -- it's easier and faster this way than
> > having vacuum give us a large data set.
>
> I'll do these tests.

I just remembered this -- did any of this kind of testing happen? I
can do it as well.

> Thank you. I've incorporated all the comments above. I've attached the
> latest patches, and am going to push them (one by one) after
> self-review again.

One more cosmetic thing in 0001 that caught my eye:

diff --git a/src/backend/access/common/Makefile
b/src/backend/access/common/Makefile
index b9aff0ccfd..67b8cc6108 100644
--- a/src/backend/access/common/Makefile
+++ b/src/backend/access/common/Makefile
@@ -27,6 +27,7 @@ OBJS = \
  syncscan.o \
  toast_compression.o \
  toast_internals.o \
+ tidstore.o \
  tupconvert.o \
  tupdesc.o

diff --git a/src/backend/access/common/meson.build
b/src/backend/access/common/meson.build
index 725041a4ce..a02397855e 100644
--- a/src/backend/access/common/meson.build
+++ b/src/backend/access/common/meson.build
@@ -15,6 +15,7 @@ backend_sources += files(
   'syncscan.c',
   'toast_compression.c',
   'toast_internals.c',
+  'tidstore.c',
   'tupconvert.c',
   'tupdesc.c',
 )

These aren't in alphabetical order.

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