Hi all being in the early production stage of two http servers implemented with twisted/nevow and making heavy use of athena I observe the following: Either server dies silently after some time ranging from 10 mins to several days with the logs being inconclusive and stopping at random points. Process image size is stable at around 120 MByte, number of concurrent users is around 150, CPU load per core is around 20%. All my testing does not reveal a single problem, everything runs fine until I let 'normal' users hit the server. The underlying OS (OpenBSD) is of no help, not a trace of the process in question can be found, it looks like they vanish into thin air. I am stumped about processes vanishing, no core, no log entries, no nothing. Does somebody out there have a clue on how to debug such a problem. TIA, Werner