19.12.2024 13:10, Andrey Borodin пишет:
On 19 Dec 2024, at 15:01, Yura Sokolov <y.soko...@postgrespro.ru> wrote:
- `&` takes 0.69ns
- `mult-rec` takes 2.94ns
- `%` takes 3.24ns.
Thanks, Yura, for benchmarks and off-list conversation.
I’ve reproduced similar numbers on my Apple M2.
I agree that additional 3-4ns are negligible in case of SLRU access.
+ bits16 nbanks;
Perhaps, it’s not bits anymore. Also, is 64K banks ought enough for everybody?
Best regards, Andrey Borodin.
There are artificial limit currently:
#define SLRU_MAX_ALLOWED_BUFFERS ((1024 * 1024 * 1024) / BLCKSZ)
#define SLRU_BANK_BITSHIFT 4
#define SLRU_BANK_SIZE (1 << SLRU_BANK_BITSHIFT)
So, there's no more than 8192 banks at the moment.
But I believe, some customers will want to have more than 1GB of SLRU in
the future. (They do already actually)
----
Yura
