Thank you Brian,
VERY helpful as usual!!
Cheers,
Sergio
On Sun, 8 Feb 2009 22:26:53 -0500
Brian Gold <bgold at cmu.edu> wrote:
> Hi Sergio,
>
> Yes, you will need to make a few changes. Here's an
>example command:
>
> stat-manager format-string
>"<EXPR:sum{Nodes-execute-Commits_x86}/
>sum{Nodes-execute-TB:(User|System):AccountedCycles}>" all
>
> and here's what is different from the UniFlex example in
>the getting started guide:
>
> - I replaced the "sys-" prefix with "Nodes-", which is
>the sum of all processors in MP simulations.
>
> - I changed "execute-Commits" to "execute-Commits_x86".
> This change makes sure we do not count HALT
>instructions more than once (Simics sends one per cycle,
>but real processors go to sleep), only counts one
> instruction even for multiple-memory-operation
>instructions, and does not count the artificial
>'instructions' generated on TLB misses, which x86
>handles in hardware.
>
> - I changed "sys-cycles" to "Nodes-execute-TB:(User|
>System):AccountedCycles". The reason sys-cycles is
>insufficient is that it only increments once for the
>whole system. For a single clock tick on a 4 processor
>machine, you really have 4 cycles to divide by in the
>IPC calculation. This more complicated expression uses
>the powerful TimeBreakdown accounting system, which can
>also tell you where time is spent in the simulator (see
>components/Common/ TimeBreakdown.hpp).
>
> Hope this helps. Let me know if you have other
>questions.
>
> Cheers,
> Brian
>
> On Feb 6, 2009, at 6:25 AM, Sergio Tota wrote:
>
>> Hi,
>>
>> I'm performing some multiprocessor simulations using the
>>CMPFlex-x86
>> target (4 processors, 4 threads).
>>
>> In the Flexus Getting Started Guide there is an example
>>command to
>> collect IPC statistics for uniprocessor architectures:
>>
>> 1 - stat-mamanger format-string
>>"<EXPR:{sys-execute-Commits}/{sys-
>> cycles}>" avg
>> 2 - stat-manager format
>>../../reports/ipc_InOrder_uniproc.rpt ".*"
>>
>> Is there any better way to calculate IPC of a
>>CMPFlex-x86 system?
>>
>> Thanks!
>>
>> Sergio
>> _______________________________________________
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>> SimFlex at ece.cmu.edu
>> https://sos.ece.cmu.edu/mailman/listinfo/simflex
>> SimFlex web page: http://www.ece.cmu.edu/~simflex
>
