Hi Andreas,
Thank you for the reply.
I understand that timing may change as I am changing bank configuration.
But my question is about *Number of memory Access to the main memory and
number of instructions simulated is changing for same program running on
different bank configuration. *
Sir, I am running same benchmark and not changing cache parameters. with
change in bank counts, Number of memory access how can change.
And number of Instructions simulated by CPU are also changing. Which are
there in stats file.Following are the numbers.
*Bank Configuration | Memory Access
| Number of instructions simulated*
4 Banks:
4207595 3752886887
8Banks :
4202333 3753032418
8Banks 2 Ranks:
4200230 3752892951
16 Banks:
4201427 3752889830
If I am running same program, then
*Number of instructions simulated should not change at least. *I want to
understand why there is minute difference between these number in place of
being the same number.
Thank you
On Mon, Mar 10, 2014 at 5:19 PM, Andreas Hansson <[email protected]>wrote:
> Hi Praxal,
>
> I am not using the ruby_fs.py script myself, so I could be wrong on this
> point, but I suspect it is using the O3 CPU by default?
>
> If it is, I'm not surprised the behaviour changes slightly when you
> alter the memory system. The dynamic program flow is influenced by the
> timing of the load/store requests, and may change. Similarly, even if
> you're using the simple timing CPU, as you are running full system, the OS
> behaviour may very well change as you perturb the memory system timings.
>
> In short, there are plenty reasons why things change, and if would be
> rather astonishing if you saw the same number of requests in all cases.
>
> I hope that makes things a bit more clear.
>
> Andreas
>
> From: Praxal Shah <[email protected]>
> Reply-To: gem5 users mailing list <[email protected]>
> Date: Monday, 10 March 2014 06:24
> To: "[email protected]" <[email protected]>
> Subject: [gem5-users] Why system.ruby.dir_cntrl0.memBuffer.memReq is
> different for same benchmark but different Bank configurations?
>
> Hi,
>
> I am running* same benchmark with different bank configuration for main
> memory* (Mem-size 1GB) as follows: 4 Banks, 8Banks, 8 Banks 2 Ranks/DIMM,
> and 16 Bank 1 Rank/DIMM.
>
> I am not changing cache hierarchy. Cache parameters are
>
> --l1i_size=32kB --l1d_size=32kB --l2cache --num-l2cache=1 --l2_size=512kB
>
> (./build/X86/gem5.opt configs/example/ruby_fs.py
> --disk-image=disks/x86root-parsec.img
> --kernel=/binaries/x86_64-vmlinux-2.6.28.4-smp --script=/mem_access.rcS
> --cpu-clock=2GHz --l1i_size=32kB --l1d_size=32kB --l2cache --num-l2cache=1
> --l2_size=512kB --mem-size=1GB -n 1
> )
>
> *Ideally,I should get request to main memory same for all the
> configureations. But I am getting following values for
> system.ruby.dir_cntrl0.memBuffer.memReq.*
>
> 4 Banks: 4207595
>
> 8Banks:4202333
>
> 8Banks 2 Ranks:4200230
>
> 16 Banks:4201427
>
> *Is it because of some limitation of gem-5 or something else ?*
>
> Please give me hint .
> I have attached stats file for each of the simulation.
> in rcS file. I am dumping stats ad reseting it before benchmark starts.
> So look at the other section of the stats.
> --
> Praxal S Shah
> 9650493254
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Praxal S Shah
9650493254
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