[gem5-users] gem5 stats , LLC average miss latency

[Arun Kavumkal via gem5-users]

I am running Gem5, X86, SE mode in 4 cores with CPU running at 3GHz (set
using --cpu-clock in Options.py), L1, L2 are private and L3 is shared. I am
using classic cache.

```
system.l3.demand_avg_miss_latency::.cpu0.data 3861061.012024   # average
overall miss latency
```

I am a little confused about the ***average miss latency values*** reported
by Gem5 stats, since the value is ***3861061 cycles*** which ~ 1.2 ms
(considering 3GHz CPU clock). Isn't too high latency to access memory on an
average considering  memory access times are always mentioned as 100s of
CPU cycles. I am using [NVMainMemory][1] as main memory,but still avg
access time in milliseconds does not fit in.

Am I missing something here?

Thanks
Arun

  [1]: https://github.com/SEAL-UCSB/NVmain
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Re: [gem5-users] gem5 stats

[Ciro Santilli]

On Tue, Nov 12, 2019 at 7:26 AM Javed Osmany 
wrote:

> Hello
>
>
>
> I wanted to experiment with enabling/disabling the existing stats in GEM5
> before I start delving into adding stats.
>
> I am assuming that all the stats implemented are enabled by default.
>
>
>
> What would be the simplest way that I can disable some existing stats in
> GEM5 and check that the stat has not been generated by checking the
> m5out/stats.txt file after the simulation has completed?
>
>
>

https://stackoverflow.com/questions/52014953/how-to-dump-only-a-single-or-certain-selected-stats-in-gem5


> Any pointers as how to go about adding new stats would also be much
> appreciated.
>
>
>

As for most tings, take the simplest stat you understand, e.g. cycle count,
and copy what it is doing :-)


>
>
> Best regards
>
>
>
> J.Osmany
>
>
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[gem5-users] gem5 stats

[Javed Osmany]

Hello

I wanted to experiment with enabling/disabling the existing stats in GEM5 
before I start delving into adding stats.
I am assuming that all the stats implemented are enabled by default.

What would be the simplest way that I can disable some existing stats in GEM5 
and check that the stat has not been generated by checking the m5out/stats.txt 
file after the simulation has completed?

Any pointers as how to go about adding new stats would also be much appreciated.


Best regards

J.Osmany

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[gem5-users] gem5 stats

[Javed Osmany]

Hello

I wanted to experiment with enabling/disabling the existing stats in GEM5 
before I start delving into adding stats.

What would be the simplest way that I can disable some existing stats in GEM5 
and check that the stat has not been generated by checking the m5out/stats.txt 
file after the simulation has completed?

Any pointers as how to go about adding new stats would also be much appreciated.


Best regards

J.Osmany

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Re: [gem5-users] gem5 stats for total instruction executed

[Balasaheb Dabhade]

Thanks Fernando for your help !!
I got the total  *total instruction executed* value as
system.cpu.iq.iqInstsIssued from stat file of gem5 output.

Thanks,
Bala

On Thu, Jun 16, 2016 at 6:25 PM, Fernando Endo 
wrote:

> Hi,
>
> Probably you'll have to check by yourself if sim_insts gives the stat that
> you want (i.e., total committed instructions since gem5 started). It seems
> that they've recently patched this stats.
>
> Regards,
>
> --
> Fernando A. Endo, Post-doc
>
> INRIA Rennes-Bretagne Atlantique
> France
>
>
> 2016-06-09 16:10 GMT+02:00 Balasaheb Dabhade :
>
>> Hi All,
>>
>> Which stats value from Gem5 out put file gives *total instruction
>> executed* values after simulation. Does total instruction
>> committed(system.cpu.committedInsts) is same as total instruction executed?
>>
>> Thanks,
>> Bala
>>
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Re: [gem5-users] gem5 stats for total instruction executed

[Fernando Endo]

Hi,

Probably you'll have to check by yourself if sim_insts gives the stat that
you want (i.e., total committed instructions since gem5 started). It seems
that they've recently patched this stats.

Regards,

--
Fernando A. Endo, Post-doc

INRIA Rennes-Bretagne Atlantique
France


2016-06-09 16:10 GMT+02:00 Balasaheb Dabhade :

> Hi All,
>
> Which stats value from Gem5 out put file gives *total instruction
> executed* values after simulation. Does total instruction
> committed(system.cpu.committedInsts) is same as total instruction executed?
>
> Thanks,
> Bala
>
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[gem5-users] gem5 stats for total instruction executed

[Balasaheb Dabhade]

Hi All,

Which stats value from Gem5 out put file gives *total instruction executed*
values after simulation. Does total instruction
committed(system.cpu.committedInsts) is same as total instruction executed?

Thanks,
Bala
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[gem5-users] gem5 Stats Based On Parituclar Events

[Chetan Patil]

Hi,

I'm trying to understand how I can get stats from gem5 simulation for
particular events only. Currently, I am running android on gem5 and
performing touch inputs on the applications. The stats I get has lot of
system level information. Is there a way to understand or capture data
related to touch inputs (or events) only ?

I did read this slide[1], where in slide number 112, it is given how to get
user defined events. Will this be helpful and how can I get more
information about this ?

Please guide me on this.

[1] : http://gem5.org/dist/tutorials/hipeac2012/gem5_hipeac.pdf

-- 
Thanks,

Chetan Patil
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