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
