[Beowulf] I/O bound simulation

Jeffrey B. Layton laytonjb at charter.net
Fri Nov 30 17:08:17 EST 2007


Mark,

We need to know some more details. Can you describe code a bit
more and the steps it takes? Can you also describe the hardware
and how the nodes are getting their data (e.g. local, NFS, etc.)?

Jeff

> Hello all,
>
> I have been reading the list for quite a while and have
> gleaned a boat load of information.
>
> Thank you.
>
> Now I am going to ask help for a problem I am having.
>
> I have simulation program that runs on between 5 and 15
> nodes. This depends on the desired fidelity of the simulation.
>
> When I approach the higher fidelity levels, the simulation starts
> to choke on the quantity of data being processed.
>
> It appears that the system is failing on I/O. Transferring large
> amounts of time critical data between process elements.
>
> I a running on a mostly standard Red Hat distro, no special
> compiling or running architectures are in place.
>
> Do any of you have suggestions as to how I might start
> getting control of this I/O problem?
>
> Thanks for any help.
>
> Mark Kozikowski
> Advanced Acoustic Concepts
>   
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