We tried that but the wait loop will suspend the
processor. The processor needs to do computation
during the wait time.
--- "Bussoletti, John E"
<john.e.bussoletti_at_[hidden]> wrote:
> An easy implementation (hack) would be to wrap all
> of your LAM/MPI calls with a subroutine and supply
> two versions of the subroutine. For nodes emulating
> the L1 latency, the subroutine is a do-nothing
> routine. For those emulating the L2 latency,
> execute a wait loop of specified duration prior to
> making the LAM/MPI call. If you want, you can even
> tailor the latencies to be different for different
> classes of commands.
>
> John Bussoletti
>
>
> -----Original Message-----
> From: John Korah [mailto:j_korah_at_[hidden]]
> Sent: Thursday, November 13, 2003 12:01 PM
> To: lam_at_[hidden]
> Subject: LAM: heterogenous links simulation
>
>
> Hi,
> I am a beginner with LAM, so please bear with me.
>
> I am trying to create a dual-tier network
> architecture
> with my 64 node cluster.
>
> This particular architecture consists of groups of
> computers called supernodes. The computers within
> the
> supernode can communicate with latency L1. the
> supernode can communicate with each other with
> latency
> L2. L2>>L1.
>
> All the computers in my cluster are connected by a
> 100MBPS ethernet link.My question is that how do i
> simulate different link speeds on this flat
> hierarchy?
>
> I am wondering if anyone in this group has seen such
> implementations. If you have Suggestion/ideas,
> please feel free.
>
> Thanks
> John Korah
> Grad Student,CS
> Virginia Tech
>
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