Hi, On 2024-06-13 17:33:57 +0200, Dmitry Dolgov wrote: > > On Mon, Jun 10, 2024 at 11:12:12AM GMT, Andres Freund wrote: > > Hi, > > > > To investigate a report of both postgres and pgbouncer having issues when a > > lot of new connections aree established, I used pgbench -C. Oddly, on an > > early attempt, the bottleneck wasn't postgres+pgbouncer, it was pgbench. But > > only when using TCP, not with unix sockets. > > > > c=40;pgbench -C -n -c$c -j$c -T5 -f <(echo 'select 1') 'port=6432 > > host=127.0.0.1 user=test dbname=postgres password=fake' > > > > host=127.0.0.1: 16465 > > host=127.0.0.1,gssencmode=disable 20860 > > host=/tmp: 49286 > > > > Note that the server does *not* support gss, yet gss has a substantial > > performance impact. > > > > Obviously the connection rates here absurdly high and outside of badly > > written > > applications likely never practically relevant. However, the number of cores > > in systems are going up, and this quite possibly will become relevant in > > more > > realistic scenarios (lock contention kicks in earlier the more cores you > > have). > > By not supporting gss I assume you mean having built with --with-gssapi, > but only host (not hostgssenc) records in pg_hba, right?
Yes, the latter. Or not having kerberos set up on the client side. Greetings, Andres Freund
