Thank you for your help i installed BLCR 0.8.5 on my ubuntu 12.10 to be used for MPICH -3.0.3 this version of blcr should support to kernels through 3.7.1 when i run the command : basma@basma-Satellite-A500:~$ mpiexec --info results: HYDRA build details: Version: 3.0.3 Release Date: Thu Mar 28 16:01:21 CDT 2013 CC: gcc CXX: c++ F77: no F90: no Configure options: '--disable-option-checking' '--prefix=/home/basma/mpich2-install' '--disable-f77' '--disable-fc' '--enable-checkpointing' '--with-hydra-ckpointlib=blcr' '--cache-file=/dev/null' '--srcdir=.' 'CC=gcc' 'CFLAGS= -O2' 'LDFLAGS= ' 'LIBS=-lrt -lcr -lpthread ' 'CPPFLAGS= -I/home/basma/libraries/mpich-3.0.3/src/mpl/include -I/home/basma/libraries/mpich-3.0.3/src/mpl/include -I/home/basma/libraries/mpich-3.0.3/src/openpa/src -I/home/basma/libraries/mpich-3.0.3/src/openpa/src -I/home/basma/libraries/mpich-3.0.3/src/mpi/romio/include' Process Manager: pmi Launchers available: ssh rsh fork slurm ll lsf sge manual persist Topology libraries available: hwloc Resource management kernels available: user slurm ll lsf sge pbs cobalt Checkpointing libraries available: blcr Demux engines available: poll select so i thought that every thing is ok but when i try to rum mpiexec it failed: basma@basma-Satellite-A500:~$ mpiexec -ckpointlib blcr -ckpoint-prefix /home/business/ckpts/app.ckpoint -ckpoint-interval 3600 -n 4 /home/basma/libraries/mpich-3.0.3/examples/cpi results: Fatal error in MPI_Init: Other MPI error, error stack: MPIR_Init_thread(433)...: MPID_Init(151)..........: channel initialization failed MPIDI_CH3_Init(70)......: MPID_nem_init(379)......: MPIDI_nem_ckpt_init(153): BLCR kernel module not present Fatal error in MPI_Init: Other MPI error, error stack: MPIR_Init_thread(433)...: MPID_Init(151)..........: channel initialization failed MPIDI_CH3_Init(70)......: MPID_nem_init(379)......: MPIDI_nem_ckpt_init(153): BLCR kernel module not present Fatal error in MPI_Init: Other MPI error, error stack: MPIR_Init_thread(433)...: MPID_Init(151)..........: channel initialization failed MPIDI_CH3_Init(70)......: MPID_nem_init(379)......: MPIDI_nem_ckpt_init(153): BLCR kernel module not present Fatal error in MPI_Init: Other MPI error, error stack: MPIR_Init_thread(433)...: MPID_Init(151)..........: channel initialization failed MPIDI_CH3_Init(70)......: MPID_nem_init(379)......: MPIDI_nem_ckpt_init(153): BLCR kernel module not present =================================================================================== = BAD TERMINATION OF ONE OF YOUR APPLICATION PROCESSES = EXIT CODE: 1 = CLEANING UP REMAINING PROCESSES = YOU CAN IGNORE THE BELOW CLEANUP MESSAGES =================================================================================== i am a Linux and parallel programming beginner Thank you