Re: Segmentation violation when running without an internet connection

From: Christopher Gillespie (
Date: Thu Dec 20 2007 - 13:53:30 CST

Hello Josh,
I also have a powerbook G4 that I run small runs with, except I have used
the pre-compiled binary with the IBM libraries. This seems to run fine
without any internet connections. Also, I do not use the "++local" when
running since I did get some error messages when I first tried it. That was
a while ago so I am not sure what they are off hand. Finally, I do not
start with "charmrun" either, although I do when on our cluster, but the
results do not seem different. Albeit I do give a seed for the comparison.

Good luck


Chris Gillespie
Ph.D. Candidate
Chemical Engineering
University of Delaware
Newark, DE 19716

On Dec 20, 2007 1:20 PM, <> wrote:

> I have compiled the net version of namd2.6 (MacOSX-ppc-c++) on my Apple
> powerbook G4 to do some development and testing. When connected to the
> internet, I am able to run namd by issuing the namd2 command as described
> in the notes.txt file for running with a single processor on a
> workstation. However without an active internet connection I get a
> segmentation violation error. I've tried running using charmrun and the
> options ++local, +p1, and ++debug in various combinations.
> The error messages I get are:
> - with charmrun ++debug ++local namd2 <input file>
> Charmrun> All clients connected.
> Charmrun> IP tables sent.
> Charmrun> node programs all connected
> Charm++: scheduler running in netpoll mode.
> Charmrun: error on request socket--
> Socket closed before recv.
> - with namd2 <input file>
> Charm++: standalone mode (not using charmrun)
> Charm++: scheduler running in netpoll mode.
> Segmentation fault
> - with charmrun ++local +p1 namd2 <input file>
> Charm++: scheduler running in netpoll mode.
> -------------- Processor 0 Exiting: Caught Signal ----------
> Signal: segmentation violation
> Suggestion: Try running with '++debug', or linking with '-memory
> paranoid'.
> Stack Traceback:
> [0] 0 libSystem.B.dylib 0x93be7bb4 _sigtramp + 68
> Fatal error on PE 0> segmentation violation
> I would like to be able to run namd without an internet connection when I
> am traveling. Any suggestions would be most appreciated.
> Josh

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