Re: Non-reproducible AIO failure

Hi,

On 2025-09-03 21:50:42 +0300, Konstantin Knizhnik wrote:
> On 03/09/2025 8:37 PM, Dmitry Mityugov wrote:
> Size of PgAioHandle is144 bytes. I wonder how critical for us is to save 9
> bytes for it (3 bytes vs 3 integers)?

Not that it makes that huge a difference, but due to alignment considerations
the size increase would be 12 bytes, not 9. Maybe that could be addressed by
more reordering though.


> Why not to use normal enums instead of bitfields and uint8 with type casts?

There are a lot of PgAioHandles when max_connections is large. In addition,
some workloads (e.g. network attached storage), one might need to increase
io_max_concurrency to actually be able to saturate storage.  An ~8% increase
in size isn't nothing when the baseline isn't small.

Greetings,

Andres Freund