Hello, I read in the MPI-3 standard that allowing MPI calls within signal handlers is implementation dependent (I guess it's the same in previous standards) . Does mpich allow MPI calls within signal handlers? Also which signals are used by mpich? Does mpich use SIGSEGV? Thank you, Matthieu Dorier PhD student at ENS Cachan Brittany and IRISA http://people.irisa.fr/Matthieu.Dorier