Hi, On 2023-10-12 11:00:22 +0300, Anton A. Melnikov wrote: > Found that simple test pgbench -c20 -T20 -j8 gives approximately > for REL_15_STABLE at 5143f76: 336+-1 TPS > and > for REL_16_STABLE at 4ac7635f: 324+-1 TPS > > The performance drop is approximately 3,5% while the corrected standard > deviation is only 0.3%. > See the raw_data.txt attached.
Could you provide a bit more details about how you ran the benchmark? The reason I am asking is that ~330 TPS is pretty slow for -c20. Even on spinning rust and using the default settings, I get considerably higher results. Oh - I do get results closer to yours if I use pgbench scale 1, causing a lot of row level contention. What scale did you use? Greetings, Andres Freund
