[gem5-users] Re: Counters for # DRAM reads, writes, page hits, and page misses

[Aritra Bagchi via gem5-users]

Hi Eliot,

In the stats, I got some of the counters I wanted. In the source code, now
I can look at how they are computed and get ideas. I wanted these data not
at the end of simulation, but at intermediate times, but I could obtain
them by controlling some parameters.

Thanks,
Aritra



On Fri, Sep 8, 2023 at 6:06 PM Eliot Moss  wrote:

> On 9/8/2023 2:55 AM, Aritra Bagchi via gem5-users wrote:
> > Hi all,
> >
> > Can anyone indicate how to extract performance counters such as the
> number of DRAM read operations,
> > the number of DRAM write operations, the number of times a page miss
> occurs, etc.?
> >
> > Inside src/mem/mem_ctrl.cc, MemCtrl::recvTimingReq( ) method, there are
> two methods for inserting
> > new read and write operations into their respective queues,
> namely addToReadQueue( )
> > and addToWriteQueue( ). Can the #reads and #writes can be obtained from
> here? And what about # page
> > hits/misses? Any help is appreciated.
>
> The way things generally work in gem5 is that you get a stats dump at
> the end of a run.  There are also ways to request such dumps more
> frequently.
> You get a lot of details about accesses to caches and memories.  Are you
> looking at stats dumps and not seeing what you hope for?
>
> Best - Eliot Moss
>
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[gem5-users] Re: Counters for # DRAM reads, writes, page hits, and page misses

[Eliot Moss via gem5-users]

On 9/8/2023 2:55 AM, Aritra Bagchi via gem5-users wrote:

Hi all,

Can anyone indicate how to extract performance counters such as the number of DRAM read operations, 
the number of DRAM write operations, the number of times a page miss occurs, etc.?


Inside src/mem/mem_ctrl.cc, MemCtrl::recvTimingReq( ) method, there are two methods for inserting 
new read and write operations into their respective queues, namely addToReadQueue( ) 
and addToWriteQueue( ). Can the #reads and #writes can be obtained from here? And what about # page 
hits/misses? Any help is appreciated.


The way things generally work in gem5 is that you get a stats dump at
the end of a run.  There are also ways to request such dumps more frequently.
You get a lot of details about accesses to caches and memories.  Are you
looking at stats dumps and not seeing what you hope for?

Best - Eliot Moss
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