Re: [Gems-users] instruction count in different GEMS protocols?

[Dan Gibson <degibson@xxxxxxxx>]

As I said before, this is expected. Instruction counts are not often useful measures for multiprocessor and/or full-system simulations.

Regards,
Dan

On Sat, Mar 14, 2009 at 4:09 PM, Konstantinos Aisopos <kaisopos@xxxxxxxxx> wrote:

Thanks for the quick respose Dan! All my simulations have the same
random seed (g_RANDOM_SEED: 1). I know that I should have
randomization enabled and run many simulations to get accurate
results, but currently I am avoiding it for simlicity.
The thing that troubles me most is that *ALL* splash specs in
MOESI_SMP have 500%-800% the number of instructions in MESI_SCMP. If I
would see such big differences in the instruction count but random, I
wouldn't bring up this question. Any additional thought you may have
please let me know. If it still seems normal to you also let me know
:)

thanks for your time!
-Kostas

On Sat, Mar 14, 2009 at 12:36 PM, Dan Gibson <degibson@xxxxxxxx> wrote:
> You should expect instruction count to vary widely even with the same
> protocol for different RANDOM_SEED, because of spinloops.
>
> Regards,
> Dan
>
> On Sat, Mar 14, 2009 at 11:44 AM, Konstantinos Aisopos <kaisopos@xxxxxxxxx>
> wrote:
>>
>> hi all,
>>
>> I am running splash specs in MESI_SCMP and MOESI_SMP and observing the
>> following: Ruby_cycles are in the same order of magnitute (+- 20%).
>> However, instructions in MOESI_SMP = (~800%) instructions in
>> MESI_SCMP.  How can the same specs with the same inputs generate 8x
>> more instructions in a different protocol? (roughly the same
>> proportion for all splash specs). Is the variable
>> *instruction_executed* trustworthy? Should I use another variable to
>> measure instruction count?
>>
>> thanks,
>> Kostas
>> _______________________________________________
>> Gems-users mailing list
>> Gems-users@xxxxxxxxxxx
>> https://lists.cs.wisc.edu/mailman/listinfo/gems-users
>> Use Google to search the GEMS Users mailing list by adding
>> "site:https://lists.cs.wisc.edu/archive/gems-users/" to your search.
>>
>
>
>
> --
> http://www.cs.wisc.edu/~gibson [esc]:wq!
>
> _______________________________________________
> Gems-users mailing list
> Gems-users@xxxxxxxxxxx
> https://lists.cs.wisc.edu/mailman/listinfo/gems-users
> Use Google to search the GEMS Users mailing list by adding
> "site:https://lists.cs.wisc.edu/archive/gems-users/" to your search.
>
>
>
_______________________________________________
Gems-users mailing list
Gems-users@xxxxxxxxxxx
https://lists.cs.wisc.edu/mailman/listinfo/gems-users
Use Google to search the GEMS Users mailing list by adding "site:https://lists.cs.wisc.edu/archive/gems-users/" to your search.

-- 
http://www.cs.wisc.edu/~gibson [esc]:wq!