On Wed, May 8, 2024 at 9:51 AM Jingtang Zhang <mrdrivingd...@gmail.com> wrote: > > Hi, Bharath. I've been testing this. It's cool. Is there any way we could > monitor the hit rate about directly reading from WAL buffers by exporting > to some views?
Thanks for looking into this. I used purpose-built patches for verifying the WAL buffers hit ratio, please check USE-ON-HEAD-Collect-WAL-read-from-file-stats.txt and USE-ON-PATCH-Collect-WAL-read-from-buffers-and-file-stats.txt at https://www.postgresql.org/message-id/CALj2ACU9cfAcfVsGwUqXMace_7rfSBJ7%2BhXVJfVV1jnspTDGHQ%40mail.gmail.com. In the long run, it's better to extend what's proposed in the thread https://www.postgresql.org/message-id/CALj2ACU_f5_c8F%2BxyNR4HURjG%3DJziiz07wCpQc%3DAqAJUFh7%2B8w%40mail.gmail.com. I haven't had a chance to dive deep into that thread yet, but a quick glance over v8 patch tells me that it hasn't yet implemented the idea of collecting WAL read stats for both walsenders and the backends reading WAL. If that's done, we can extend it for WAL read from WAL buffers. -- Bharath Rupireddy PostgreSQL Contributors Team RDS Open Source Databases Amazon Web Services: https://aws.amazon.com