How can a soft limit for the wall clock time be used?
At the moment there is no way to use the soft limit.
The signal, which is send by LoadLeveler on the front-end node is not routed to the BlueGene application.
The only, whereas not fully adequate, alternative is to check the user time from within the application and estimate manually the remaining time, see: How to do memory or time measurements in Fortran and C ?
(The boot time for the partition is part of the wall_clock_limit.)