Greg Smith <gsmith@gregsmith.com> wrote:
> There's a couple of potential to-do list ideas that build on the changes
> in this area in 8.3:
>
> -Aggressively pre-allocate WAL segments
> -Space out checkpoint fsync requests in addition to disk writes
> -Consider re-inserting a smarter bgwriter all-scan that writes sorted by
> usage count during idle periods
I'd like to add:
- Remove "filling with zero" before we recycle WAL segments.
If it is not needed, we can avoid buffered i/o on open_sync except
first allocation of segments. I think we can do it if we have more
robust WAL records that can ignore garbage data written before.
Regards,
---
ITAGAKI Takahiro
NTT Open Source Software Center