Collected from the PG bugs email list.
|OS||Debian Sid x64|
Body of first available message related to this bug follows.
The following bug has been logged on the website: Bug reference: 15953 Logged by: richard Email address: (redacted) PostgreSQL version: 11.5 Operating system: Debian Sid x64 Description: hi, i upgraded my server from 11.4-1 ( note, this was the debian package before ) to 11.5-1.pgdg+1 which uses the postgresql apt repository package. after this upgrade, i noticed a lot more system load and all 4 cores of my server hit 100% usage by the database. visualized you can see it here: CPU usage https://verfriemelt.org/pg-issue-01.png TPS https://verfriemelt.org/pg-issue-02.png at ~11:10 i installed the new version, afterwards you see the cpu hit 100% usage and than followed some desperate measures to get the database to perform normal again, mostly reindex and vacuum full on the given database. at 14:30 i wondered and installed the debian provided 11.5-1 package and everything went back to 'normal' without any other changes. there was not a single cause like a long running query. just everything went a lot slower and used more cpu. there were no obvious differences in query planning. the two versions were the following: # apt-cache policy postgresql-11 postgresql-11: Installed: 11.5-1 Candidate: 11.5-1.pgdg+1 Version table: 11.5-1.pgdg+1 500 500 http://apt.postgresql.org/pub/repos/apt sid-pgdg/main amd64 Packages *** 11.5-1 500 500 http://ftp.de.debian.org/debian sid/main amd64 Packages 100 /var/lib/dpkg/status using pg_config --configure i found only one difference in the build options, which is --enable-cassert on the postgresql provided version. whast the deal?
|2019-08-13 13:11:14+00||PG Bug reporting form||BUG #15953: performance issues using 11.5-1.pgdg+1 over 11.5-1|
|2019-08-14 03:23:53+00||easteregg(at)verfriemelt(dot)org||RE: BUG #15953: performance issues using 11.5-1.pgdg+1 over 11.5-1|