HI??Stephan??
I think I ??m not speak this problem clearly
I have configured gem5 as per-core DVFS in the 2-core platform. Orignally, I
want to the two cores operating at different frequencies, e.g., one in 1GHz and
the other in 750MHz.After running the benckmark ValStreamScale ,
command line: ./build/ARM/gem5.opt --debug-flags=DVFS,EnergyCtrl
--debug-file=dfvs_debug.log --stats-file=ValStreamScale7505.2percore-stats.txt
configs/example/fs.py -b ValStreamScale --cpu-type=AtomicSimpleCPU -n 2
--machine-type=VExpress_EMM
--kernel=/home/jinsong/gem5/linux-linaro-tracking-gem5/vmlinux
--dtb-filename=/home/jinsong/gem5/linux-linaro-tracking-gem5/arch/arm/boot/dts/vexpress-v2p-ca15-tc1-gem5_dvfs_per_core_2cpus.dtb
--disk-image=/home/jinsong/gem5/dist/disks/arm-ubuntu-natty-headless.img
'--cpu-clock=[1 GHz,750 MHz,500 MHz]'
the statistical file shows that there are actual two clock domains.
system.cpu_voltage_domain.voltage 1 #
Voltage in Volts
system.cpu_clk_domain0.clock 1000 #
Clock period in ticks
system.cpu_clk_domain1.clock 1000 #
Clock period in ticks
However, I cannot assign different clock frequency to them separately
system.cpu_clk_domain0.clock 1000 #
Clock period in ticks
system.cpu_clk_domain1.clock 1000 #
Clock period in ticks
I have tried to change the cpu clock by m5term,in this fields
/sys/devices/system/cpu/cpufreq/ ,but it does not work.
I have changed fs.py by following this link
https://www.mail-archive.com/[email protected]/msg11068.html
So can you tell me how can I address this problem?
thanks for any help!
Bing Liang
------------------ ???????? ------------------
??????: "Stephan Diestelhorst";<[email protected]>;
????????: 2015??6??2??(??????) ????3:58
??????: "gem5-users"<[email protected]>;
????: Re: [gem5-users]?????? Running benchmarks in gem5 with DVFS
I am not sure I understand the problem. If you have DVFS working (see
the link to the wiki) including per-core DVFS (see the earlier comments
regarding socket_id), then Linux should automatically adjust the CPU
frequency, if you select the right governor (for example "interactive"
or "ondemand").
That means that you then simply run your application and Linux will do
things automatically. If you want to control DVFS from the application
directly, then you need to tell Linux to do so, for example have the
application write to the right fields in
/sys/devices/system/cpu/cpufreq/*
--
Sincerely,
Stephan
Stephan Diestelhorst
Staff Engineer,
ARM Research - Systems
+44 (0)1223 405662
On Monday 01 June 2015 15:43:26 ?????G?? wrote:
> thank you very much for your reply!
> I want to run a benchmark in the fs mode,but I don't konw how to add DVFS to
> each core. Could you help me?
>
> ------------------ ???????? ------------------
> ??????: "Stephan Diestelhorst";<[email protected]>;
> ????????: 2015??6??1??(??????) ????7:05
> ??????: "gem5-users"<[email protected]>;
> ????: Re: [gem5-users] Running benchmarks in gem5 with DVFS
>
> Hi Bing Liang,
> I am not sure what you mean with "finished the DVFS experiments". If
> you followed the tutorial, then now is the time to add some workloads to
> the disk image and start them and see what happens to DVFS.
>
> I suppose this depends on which workloads you want to run.
>
> --
> Sincerely,
> Stephan
>
> Stephan Diestelhorst
> Staff Engineer,
> ARM Research - Systems
> +44 (0)1223 405662
>
> On Monday 01 June 2015 09:38:41 ?????G?? wrote:
> > Hello ??everyone??
> >
> > I want to run a benchmark to evaluate DVFS in the gem5 fs mode. I have
> >
> > finished the DVFS experiments.Now,I want to run a benchmark under it.What
> > should I do next?Which command should I use?
> >
> > thanks for any help!
> >
> > Bing Liang
>
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