Re: Streamify more code paths

Hi,

On Tue, 10 Mar 2026 at 16:23, Xuneng Zhou <xunengzhou(at)gmail(dot)com> wrote:
>
> Another code path that showed significant performance improvement is
> pgstatindex [1]. I've incorporated the test into the script too. Here
> are the results from my testing:
>
> method=worker io-workers=12
> pgstatindex_large base= 233.8ms patch= 54.1ms 4.32x
> ( 76.8%) (reads=27460→1757, io_time=213.94→6.31ms)
>
> method=io_uring
> pgstatindex_large base= 224.2ms patch= 56.4ms 3.98x
> ( 74.9%) (reads=27460→1757, io_time=204.41→4.88ms)

I didn't run the benchmark yet but here is a small suggestion for the
pgstatindex patch:

+ p.current_blocknum = BTREE_METAPAGE + 1;
+ p.last_exclusive = nblocks;

for (blkno = 1; blkno < nblocks; blkno++)

...

+ p.current_blocknum = HASH_METAPAGE + 1;
+ p.last_exclusive = nblocks;

for (blkno = 1; blkno < nblocks; blkno++)

Could you move 'BTREE_METAPAGE + 1' and 'HASH_METAPAGE + 1' into
variables and then set p.current_blocknum and blkno using those
variables? p.current_blocknum and blkno should have the same initial
values, this change makes code less error prone and easier to read in
my opinion.

Other than the comment above, LGTM.

--
Regards,
Nazir Bilal Yavuz
Microsoft