On Sun, May 29, 2022 at 01:20:12PM +0000, James Pang (chaolpan) wrote:
> We have a performance test on Postgresql 13.4 on RHEL8.4 , just after connection storm in ( 952 new connections
comingin 1 minute), a lot of backends start on " D " state, and when more sessions got disconnected, they do not exit
successfully,instead became "defunct". No errors from postgresql.log , just after the connection storm, some pg_cron
workerscan not started either. The server is a Virtual machine and no IO hang (actually) IO load is very low. Could
bea postgresql bug or an OS abnormal behavior?
What settings have you set ?
https://wiki.postgresql.org/wiki/Server_Configuration
What extensions do you have loaded? \dx
Send the output of SELECT * FROM pg_stat_activity either as an attachment or in
\x mode?
What is your data dir ? Is it on the VM's root filesystem or something else ?
Show the output of "mount". Are there any kernel messages in /var/log/messages
or `dmesg` ?
How many relations are in your schema ?
Are you using temp tables ?
Long-running transactions ?
--
Justin