Charm++ parallel programming system

[Christopher Butler <chris.butler AT monash.edu>]

Thanks Phil, 
Luckily the production platforms have randomisation off.


On 21/02/2011, at 12:59 PM, Phil Miller wrote:

> On Thu, Dec 16, 2010 at 16:59, Christopher Butler
> <chris.butler AT monash.edu>
>  wrote:
>> 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?
> 
> This warning can only affect programs that use the isomalloc memory
> allocator for transparent migration purposes. Primarily, that means
> AMPI applications. If you're writing Charm++ code, this warning can
> safely be disregarded.
> 
> Sorry about the long-delayed response to this message. It appears to
> have been caught in the list's moderation queue.
> 
> Phil