Hi Willy
On 7/10/20 4:12 PM, Willy Wolff wrote:
Hi Lukasz,
On 2020-07-08-15-25-03, Lukasz Luba wrote:
Hi Willy,
On 7/3/20 1:33 PM, Willy Wolff wrote:
Hi Chanwoo,
I think it doesn't help on the benchmark I suggested that is doing only memory
accesses. With both timer, I have the same timing.
To test the benchmark with these new patches about timer:
git clone https://github.com/wwilly/benchmark.git \
&& cd benchmark \
&& source env.sh \
&& ./bench_build.sh \
&& bash source/scripts/test_dvfs_mem_patched.sh
The benchmark is set by default to run for 1s, but you can increase this by
tweaking the script as:
taskset 8 ./bench_install/bin/microbe_cache 33554431 0 9722222 <TIME in sec> ${little_freq}
Also, as I reported the issue, would it be possible to add a
Reported-by: Willy Wolff <willy.mh.wolff.ml@xxxxxxxxx> ?
Many thanks in advance.
Thank you for your good work and the benchmark. I hope you will continue
to use it and report some issues. I am going to send a follow up patches
for the DMC and I will add your 'Reported-by'. In the tests I can see
the improvements, but it's worth to consult with you if I understand
the new results correctly.
Thanks for that. I will follow on the other patch thread discussion.
I think there is still some area for improvements in the devfreq and you
could find the interesting bits to contribute.
In fact, this benchmark is motivated about part of my PhD research that has just
been accepted at LCTES2020: "Performance Optimization on big.LITTLE Architectures:
A Memory-latency Aware Approach" at https://dl.acm.org/doi/10.1145/3372799.3394370
Congrats and thank you for the link (I will read it).
Basically, it's about snooping latency with "bad" CPU DVFS choice on big.LITTLE
systems or more generally SMP/AMP architecture. I'm cleaning up my code and will
propose patches as an RFC later. It introduces a new CPU DVFS governor to limit
snooping latency.
This is interesting, please add me on CC in the patch set.
Regards,
Lukasz
