[ejabberd] Ejabberd shared roster performance

Gregory Makarov gmakarov at gmail.com
Wed Jan 3 05:04:10 MSK 2018


I've done some load testing of Ejabberd and I see some strange results.

Ejabberd 17.08 on two node cluster with 4CPU cores (2.60GHz) and 8GB of
memory on each node.
5000 online users in 250 shared rosters (20 users per shared roster).
"roster" table is empty. Users change their presence approximately each
minute (Away -> DND -> Away).
CPU usage on both nodes - approximately 350%.

Why CPU usage is so high?

Thank you,
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