Re: SLRU optimization - configurable buffer pool and partitioning the SLRU lock - Mailing list pgsql-hackers

> On 14 Dec 2023, at 14:28, tender wang <tndrwang@gmail.com> wrote:
>
>   Now that AND is more faster, Can we  replace the '% SLRU_MAX_BANKLOCKS' operation in  SimpleLruGetBankLock()  with
'&127' 

unsigned int GetBankno1(unsigned int pageno) {
return pageno & 127;
}

unsigned int GetBankno2(unsigned int pageno) {
return pageno % 128;
}

Generates with -O2

GetBankno1(unsigned int):
mov eax, edi
and eax, 127
ret
GetBankno2(unsigned int):
mov eax, edi
and eax, 127
ret


Compiler is smart enough with constants.


Best regards, Andrey Borodin.