NAMD warning: Randomization of stack point is turned on in kernal, thread migration may not work!

From: Yarrow Madrona (
Date: Thu Mar 05 2015 - 10:58:11 CST


This may be more appropriate for the CHARMM forum, but I am not sure. I am
running NAMD_2.9_Source compiled for mpi on linux-x86_64. Everything runs
well however I get the following warning in the log file:

Charm++> Running on MPI version: 3.0
Charm++> level of thread support used: MPI_THREAD_SINGLE (desired:
Charm++> Running in non-SMP mode: numPes 32
Charm++> Using recursive bisection (scheme 3) for topology aware partitions
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'.*
CharmLB> Load balancer assumes all CPUs are same.
Charm++> Running on 19 unique compute nodes (16-way SMP).
Charm++> cpu topology info is gathered in 0.026 seconds.
Info: NAMD 2.10 for Linux-x86_64-MPI

I want to know what this means and if this is something to worry about
given it did not appear to effect the simulation.

Thank you.


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