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[charm] Stack pointer randomization warning.

From: Christopher Butler <chris.butler AT monash.edu>
To: charm AT cs.uiuc.edu
Subject: [charm] Stack pointer randomization warning.
Date: Thu, 16 Dec 2010 22:59:21 -0000
List-archive: <http://lists.cs.uiuc.edu/pipermail/charm>
List-id: CHARM parallel programming system <charm.cs.uiuc.edu>

Dear all,

I am beginning to write a parallel application using charm++ and have started running some small scale tests of load balancing using the mpi-linux version of charm++. However, I receive the following warning:

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'.

Yet the program appears to run acceptably within a single system.

My question is when does this warning matter? or when can it cause the application to crash?

Chris Butler

[charm] Stack pointer randomization warning., Christopher Butler, 12/16/2010