Hi, On 2023-07-03 11:55:13 +0900, Masahiko Sawada wrote: > While testing PG16, I observed that in PG16 there is a big performance > degradation in concurrent COPY into a single relation with 2 - 16 > clients in my environment. I've attached a test script that measures > the execution time of COPYing 5GB data in total to the single relation > while changing the number of concurrent insertions, in PG16 and PG15. > Here are the results on my environment (EC2 instance, RHEL 8.6, 128 > vCPUs, 512GB RAM):
Gah, RHEL with its frankenkernels, the bane of my existance. FWIW, I had extensively tested this with XFS, just with a newer kernel. Have you tested this on RHEL9 as well by any chance? Greetings, Andres Freund
