Re: [Gems-users] The distribution of "total_misses" in ruby stats output

[Dan Gibson <degibson@xxxxxxxx>]

Interesting. Can you modify SimicsDriver.C to print processor IDs of 
each request, and verify manually whether Ruby is actually seeing 
requests from all 16 procs? The processor ID can be found right after 
the call to SIMICS_get_proc_no() in makeRequest().
Regards,
Dan

Lide Duan wrote:
> I am using Simics2.2.19 + GEMS1.4, and simulating sarek target machine 
> running Solaris9 OS. I also verified in the Simics command line, there 
> are only phys_mem0.xxx commands. So I think there is only one 
> phys_mem, i.e. phys_mem0. Then what might be the problem?
> Lide
>
> On 8/24/07, *Dan Gibson* <degibson@xxxxxxxx 
> <mailto:degibson@xxxxxxxx>> wrote:
>     Which version of Simics are you using, and what is your target
>     machine?
>
>     My initial thought is that there are more than one phys_mem* objects,
>     and Ruby is only attaching itself to phys_mem0 (in Simics 2.x/Sarek
>     target, there is _ONLY_ phys_mem0). However, with some other
>     versions of
>     Simics and/or different target machines, there are sometimes phys_mem
>     objects for EACH cpu -- verify that you only have one phys_mem* object
>     (via the Simics command line), and that its name is phys_mem0.
>
>     Regards,
>     Dan
>
>     Lide Duan wrote:
>     > I found something strange when looking at the ruby stats output
>     files.
>     > I am simulating some 16p checkpoints. If I place all the 16p on a
>     > single chip (g_PROCS_PER_CHIP 16), the results related to cache
>     misses
>     > are shown as follow:
>     >
>     > Total_misses: 2537939
>     > total_misses: 2537939 [ 2537939 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ]
>     > user_misses: 1763423 [ 1763423 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ]
>     > supervisor_misses: 774516 [ 774516 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ]
>     >
>     > I suppose the 16 numbers in the brackets correspond to the
>     misses on
>     > each processor, but as we can see only misses on the 1st processor
>     > were observed. On the other hand, I also got the followings:
>     >
>     > instruction_executed: 1322569080 [ 82094180 83437607 81021513
>     81093394
>     > 82632809 122205588 82083483 80671650 81138678 80191395 79408095
>     > 79763896 81353502 81528474 62244475 81700341 ]
>     > cycles_per_instruction: 4.63392 [ 4.66589 4.59077 4.72767 4.72348
>     > 4.63548 3.13441 4.6665 4.74817 4.72084 4.77661 4.82372 4.80221
>     4.70837
>     > 4.69827 6.15384 4.68839 ]
>     > misses_per_thousand_instructions: 1.91895 [ 30.915 0 0 0 0 0 0 0
>     0 0 0
>     > 0 0 0 0 0 ]
>     >
>     > So definitely all the processors were running something, but why
>     were
>     > the misses on the 1st processor observed only?
>     >
>     > To address this problem, I tried different configurations. If I
>     place
>     > the processors on 4 chips each containing 4p, the first 4 numbers in
>     > the total_misses brackets are not zeros. Also, if one processor
>     on one
>     > chip (totally 16 chips), all the 16 numbers are not zeros.
>     Therefore,
>     > I guess the numbers indicate the misses on each CHIP, not each
>     > processor. Am I right? or did I miss something here? Actually I
>     tried
>     > different workloads with different network topologies, but got the
>     > similar results. Can anybody give me some explanation?
>     >
>     > Thanks,
>     > Lide
>     >
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