[CWB] What can I do to reduce/control disk I/O in cqpweb?

[Jörg Knappen]

I am running cqpweb (currently version 3.3.17) on a virtual machine with 
Ubuntu 22.04 LTS. Recently, we watched
severe slowdowns of cqpweb caused by disk I/O (memory and cpu usage 
weren't the bottlenecks).

What can I do to reduce disk I/O or to control it somehow? The slowdowns 
already occurred with modest-sized corpora
on frequency breakdown and distribution. Things the were no problem in 
the past (like holding a cqpweb course with
30 participants all doing frequency tables and distribution more or less 
simultaneously) seem impossible right now.

Greetings from Saarbrücken,

--Jörg Knappen