I changed :
maxconnections from 100 down to 50
maxthreads 10 down to 6
minthreads from 5 down to 3
After a restart of aolserver :
at 01:00 the rss was 104656,
at 08:40 the rss was 119880,
at 20:33 the rss was 132588
In that time there have been no more than 130 page requests
The environment has not changed recently, so I'm struggling to explain why I'm getting over-usage now. Maybe in the past the hosting went down frequently enough to mask the issue with over usage.
thanks,
Robert