That stat is for SMT-style cores, not MT.
Ali
On Nov 26, 2013, at 7:45 AM, Mahmood Naderan <[email protected]> wrote:
> Hi,
> Looking in to code cpu.cc, I see
>
> ipc
> .name(name() + ".ipc")
> .desc("IPC: Instructions Per Cycle")
> .precision(6);
> ipc = committedInsts / numCycles;
>
> totalIpc
> .name(name() + ".ipc_total")
> .desc("IPC: Total IPC of All Threads")
> .precision(6);
> totalIpc = totalCommittedInsts / numCycles;
>
> That means, in a multicore simulation the ipc_total is calculated based on
> the aggregate number of instructions. For example, assume
>
> core0: inst=500, cycle=500
> core1: inst=400, cycle=500
> core2: inst=600, cycle=500
> core3: inst=600, cycle=500
>
> So gem5 will report ipc_total=2100/500=4.2.Is that right?
>
> However another approach is to take HMEAN since we are averaging of rates.
> IPC_of_multicore=HMEAN(IPC_of_each_core)
> So the result will be 1.02
>
> Any idea on that?
>
> Regards,
> Mahmood
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