Re: index prefetching
Konstantin Knizhnik <knizhnik@garret.ru>
Commits
GET /api/v1/messages/:b64id/commits
the thread's linked commits as JSON, with link sources.
API reference →
-
aio: io_uring: Trigger async processing for large IOs
- a9ee66881744 19 (unreleased) landed
-
read stream: Split decision about look ahead for AIO and combining
- 8ca147d582a5 19 (unreleased) landed
-
read_stream: Only increase read-ahead distance when waiting for IO
- f63ca3379025 19 (unreleased) landed
-
read_stream: Prevent distance from decaying too quickly
- 6e36930f9aaf 19 (unreleased) landed
-
Reduce ExecSeqScan* code size using pg_assume()
- b227b0bb4e03 19 (unreleased) cited
-
Fix rare bug in read_stream.c's split IO handling.
- b421223172a2 19 (unreleased) cited
-
Fix multiranges to behave more like dependent types.
- 3e8235ba4f9c 17.0 cited
-
Add EXPLAIN (MEMORY) to report planner memory consumption
- 5de890e3610d 17.0 cited
-
Optimize nbtree backward scan boundary cases.
- c9c0589fda0e 17.0 cited
-
Increment xactCompletionCount during subtransaction abort.
- 90c885cdab8b 14.0 cited
-
Add nbtree Valgrind buffer lock checks.
- 4a70f829d86c 14.0 cited
-
Add nbtree high key "continuescan" optimization.
- 29b64d1de7c7 12.0 cited
-
Reduce pinning and buffer content locking for btree scans.
- 2ed5b87f96d4 9.5.0 cited
-
Teach btree to handle ScalarArrayOpExpr quals natively.
- 9e8da0f75731 9.2.0 cited
On 22/01/2024 1:47 am, Tomas Vondra wrote: > h, right. Well, you're right in this case we perhaps could set just one > of those flags, but the "purpose" of the two places is quite different. > > The "prefetch" flag is fully controlled by the prefetcher, and it's up > to it to change it (e.g. I can easily imagine some new logic touching > setting it to "false" for some reason). > > The "data" flag is fully controlled by the custom callbacks, so whatever > the callback stores, will be there. > > I don't think it's worth simplifying this. In particular, I don't think > the callback can assume it can rely on the "prefetch" flag. > Why not to add "all_visible" flag to IndexPrefetchEntry ? If will not cause any extra space overhead (because of alignment), but allows to avoid dynamic memory allocation (not sure if it is critical, but nice to avoid if possible).