Charm++ parallel programming system

[Xuehan Xu <xxhdx1985126 AT gmail.com>]

Dear Sirs:
       I tried to run BigSim on two machines, but the following error came up:

[root@localhost
 Cjacobi3D]# ./charmrun +p2 ./jacobi 4 4 4 +x4 +y4 +z4
++remote-shell ssh
Charmrun> started all node programs in 1.226 seconds.
Converse/Charm++ Commit ID:
Warning> Randomization of stack pointer is turned on in kernel, thread
migration may not work! Run 'echo 0 >
/proc/sys/kernel/randomize_va_space' as root to disable it, or try run
with '+isomalloc_sync'.
Charm++> scheduler running in netpoll mode.
BG info> Simulating 4x4x4 nodes with 1 comm + 1 work threads each.
BG info> Network type: bluegene.
alpha: 1.000000e-07     packetsize: 1024        
CYCLE_TIME_FACTOR:1.000000e-03.
CYCLES_PER_HOP: 5       CYCLES_PER_CORNER: 75.
BG info> cpufactor is 1.000000.
BG info> floating point factor is 0.000000.
BG info> Using WallTimer for timing method.
CharmLB> Load balancer ignores processor background load.
------------- Processor 1 Exiting: Caught Signal ------------
Signal: segmentation violation
Suggestion: Try running with '++debug', or linking with '-memory
paranoid' (memory paranoid requires '+netpoll' at runtime).
[1] Stack Traceback:
  [1:0] [0x81c420]
  [1:1] AMPI_threadstart+0x4b  [0x8141f7d]
  [1:2] /root/charm_emu/net-linux-bigemulator/examples/ampi/Cjacobi3D/./jacobi
[0x8182c01]
  [1:3] /root/charm_emu/net-linux-bigemulator/examples/ampi/Cjacobi3D/./jacobi
[0x81a3227]
  [1:4] qt_error+0  [0x82a9db2]
Fatal error on PE 1> segmentation violation

        The .nodelist file that I wrote is like this:

group main
host 192.168.5.169
host 192.168.5.172

       But if I run two BigSim process on the same machine, it can end 
normally.
       What should I do to deal with it?

Thanks:-)