Running Oracle Iplanet Web server 7.0.11 on RHEL 5.4. The system runs out of swap space because web instances never release used swap space. So, at the end of about one month, system hangs because there is no more swap space available.
Restarting web instances you can see, depending on the instance, that up to 40 % of swap space is released.
The system usually is not paging, so there is no reason to keep the swap space reserved for ever.
Is there any parameter which can control this behavior ?