(This might be of interest to folks on eas-dev, adding them to cc)
On Wed, Jun 24, 2015 at 11:53 AM, Vincent Guittot vincent.guittot@linaro.org wrote:
On 24 June 2015 at 03:41, pang.xunlei@zte.com.cn wrote:
Hi Vincent,
Vincent Guittot vincent.guittot@linaro.org wrote 2015-06-23 PM 09:43:55:
Re: [RESEND PATCH v2] doc: measure the efficiency of cpufreq governors
Hi Xunlei,
I have run the bench on a quad A15 with sched-dvfs (but without eas patches unlike you) #sudo ./test.sh 4 100 1000 Frequency domain CPU0~CPU3, run 100ms, sleep 1000ms: powersave efficiency: 0% performance efficiency: 100% conservative efficiency: 18% ondemand efficiency: 48% cfs efficiency: 24%
#sudo ./test.sh 4 200 1000 Frequency domain CPU0~CPU3, run 200ms, sleep 1000ms: powersave efficiency: 0% performance efficiency: 100% conservative efficiency: 40% ondemand efficiency: 68% cfs efficiency: 30%
$ sudo ./test.sh 4 50 1000 Frequency domain CPU0~CPU3, run 50ms, sleep 1000ms: powersave efficiency: 0% performance efficiency: 100% conservative efficiency: 0% ondemand efficiency: 25% cfs efficiency: 19%
As an example, here is the result when ondemand parameter are tuned for the platform sudo ./test.sh 4 100 1000 Frequency domain CPU0~CPU3, run 100ms, sleep 1000ms: powersave efficiency: 0% performance efficiency: 100% conservative efficiency: 19% ondemand efficiency: 94% cfs efficiency: 23%
Beside these results, i have seen variation in the results that confirm the interest of having more statistics like, min, man stdev
I guess the hardware environment has something to do with this, on my platform, there're 11 available freuencies in total: 1200Mhz~2200Mhz, the step size is 100Mhz.
Yes for sure, it was just to give some figures with a different platform. Regarding the variation, i have seen these variations for the same platform with the same SW. Nevertheless, this variations are somewhat normal if we consider the default sampling rate of 164ms for some governor compared to a run duration of 100ms
Regards, Vincent
Also it may get different results when running with different workload loops.
-Xunlei
Regards, Vincent
On 18 June 2015 at 13:35, pang.xunlei@zte.com.cn wrote:
Just tested on my Intel EAS test environment(implemented x86 frequency invariant hook). With EAS disabled and sched-dvfs enabled.
#./test.sh 3 100 1000 Frequency domain CPU0~CPU2, run 100ms, sleep 1000ms: powersave efficiency: 0% performance efficiency: 100% conservative efficiency: 92% ondemand efficiency: 97% cfs efficiency: 79%
#./test.sh 3 200 1000 Frequency domain CPU0~CPU2, run 200ms, sleep 1000ms: powersave efficiency: 0% performance efficiency: 100% conservative efficiency: 97% ondemand efficiency: 99% cfs efficiency: 89%
#./test.sh 3 50 1000 Frequency domain CPU0~CPU2, run 50ms, sleep 1000ms: powersave efficiency: 0% performance efficiency: 100% conservative efficiency: 93% ondemand efficiency: 96% cfs efficiency: 58%
#./test.sh 3 1000 100 Frequency domain CPU0~CPU2, run 1000ms, sleep 100ms: powersave efficiency: 0% performance efficiency: 100% conservative efficiency: 99% ondemand efficiency: 99% cfs efficiency: 97%
Seems sched-dvfs is computing inefficient at low cpu usage(implies
power
efficient), but computing efficient at high cpu usage.
-Xunlei
Xunlei Pang xlpang@126.com wrote 2015-06-18 PM 05:06:07:
[RESEND PATCH v2] doc: measure the efficiency of cpufreq governors
From: Xunlei Pang pang.xunlei@linaro.org
DVFS adds a latency in the execution of task because of the time to decide to move at max freq. We need to measure this latency and check that the governor stays in an acceptable range.
When workgen runs a json file, a log file is created for each thread. This log file records the number of loop that has been executed and the duration for executing these loops (per phase). We can use these figures to evaluate to latency that is added by a cpufreq governor and its "performance efficiency".
We use the run+sleep pattern to do the measurement, for the run time
per
loop, the performance governor should run the expected duration as
the
CPU stays a max freq. At the opposite, the powersave governor will
give
use the longest duration (as it stays at lowest OPP). Other governor
will
be somewhere between the 2 previous duration as they will use several
OPP
and will go back to max frequency after a defined duration which
depends
on its monitoring period.
The formula:
duration of powersave gov - duration of the gov-------------------------------------------------------- x 100% duration of powersave gov - duration of performance gov
will give the efficiency of the governor. 100% means as efficient as the perf governor and 0% means as efficient as the powersave
governor.
This patch offers json files and shell scripts to do the measurement,
Usage: ./test.sh <cpus> <runtime> <sleeptime> cpus: number of cpus in the CPU0's frequency domain runtime: running time in ms per loop of the workload pattern sleeptime: sleeping time in ms per loop of the workload pattern
Example: "./test.sh 4 100 1000" means CPU0~CPU3 sharing frequency, "100ms run + 1000ms sleep" workload
pattern.
test result on my machine: ~#./test.sh 4 100 1000 Frequency domain CPU0~CPU3, run 100ms, sleep 1000ms: powersave efficiency: 0% performance efficiency: 100% conservative efficiency: 28% ondemand efficiency: 95%
NOTE: Make sure there are "sed", "cut", "grep", "rt-app", etc tools
on
your test machine, and run the script under root privilege.
Signed-off-by: Xunlei Pang pang.xunlei@linaro.org
doc/examples/cpufreq_governor_efficiency/README | 54
++++++++++++++
.../cpufreq_governor_efficiency/calibration.json | 27 +++++++ .../cpufreq_governor_efficiency/calibration.sh | 11 +++ doc/examples/cpufreq_governor_efficiency/dvfs.json | 27 +++++++ doc/examples/cpufreq_governor_efficiency/dvfs.sh | 38 ++++++++++ doc/examples/cpufreq_governor_efficiency/test.sh | 82 +++++++++++ +++++++++++ 6 files changed, 239 insertions(+) create mode 100644 doc/examples/cpufreq_governor_efficiency/README create mode 100644
doc/examples/cpufreq_governor_efficiency/calibration.json
create mode 100755
doc/examples/cpufreq_governor_efficiency/calibration.sh
create mode 100644
doc/examples/cpufreq_governor_efficiency/dvfs.json
create mode 100755 doc/examples/cpufreq_governor_efficiency/dvfs.sh create mode 100755 doc/examples/cpufreq_governor_efficiency/test.sh
diff --git a/doc/examples/cpufreq_governor_efficiency/README b/doc/ examples/cpufreq_governor_efficiency/README new file mode 100644 index 0000000..cc8efe1 --- /dev/null +++ b/doc/examples/cpufreq_governor_efficiency/README @@ -0,0 +1,54 @@ +Measure the efficiency of cpufreq governors using rt-app
+BACKGROUND:
- DVFS adds a latency in the execution of task because of the time
to
- decide to move at max freq. We need to measure this latency and
check
- that the governor stays in an acceptable range.
- When workgen runs a json file, a log file is created for each
thread.
- This log file records the number of loop that has been executed
and
- the duration for executing these loops (per phase). We can use
these
- figures to evaluate to latency that is added by a cpufreq
governor
- and its "performance efficiency".
- We use the run+sleep pattern to do the measurement, for the run
time per
- loop, the performance governor should run the expected duration
as
the
- CPU stays a max freq. At the opposite, the powersave governor
will
give
- use the longest duration (as it stays at lowest OPP). Other
governor will
- be somewhere between the 2 previous duration as they will use
several OPP
- and will go back to max frequency after a defined duration which
depends
- on its monitoring period.
- The formula:
duration of powersave gov - duration of the gov- -------------------------------------------------------- x 100%
duration of powersave gov - duration of performance gov- will give the efficiency of the governor. 100% means as
efficient
as
- the perf governor and 0% means as efficient as the powersave
governor.
- This test offers json files and shell scripts to do the
measurement,
+USAGE:
- ./test.sh <cpus> <runtime> <sleeptime>
- cpus: number of cpus in the CPU0's frequency domain
- runtime: running time in ms per loop of the workload pattern
- sleeptime: sleeping time in ms per loop of the workload pattern
+Example:
- "./test.sh 4 100 1000" means
- CPU0~CPU3 sharing frequency, "100ms run + 1000ms sleep" workload
pattern.
- test result on an Intel machine:
- ~#./test.sh 4 100 1000
- Frequency domain CPU0~CPU3, run 100ms, sleep 1000ms:
- powersave efficiency: 0%
- performance efficiency: 100%
- conservative efficiency: 28%
- ondemand efficiency: 95%
+NOTE:
- Make sure there are "sed", "cut", "grep", "rt-app", etc tools
on your test
- machine, and run the script under root privilege.
diff --git a/doc/examples/cpufreq_governor_efficiency/ calibration.json
b/doc/examples/cpufreq_governor_efficiency/calibration.json
new file mode 100644 index 0000000..4377990 --- /dev/null +++ b/doc/examples/cpufreq_governor_efficiency/calibration.json @@ -0,0 +1,27 @@ +{
- "tasks" : {
"thread" : {"instance" : 1,"cpus" : [0],"loop" : 1,"phases" : {"run" : {"loop" : 1,"run" : 200000,},"sleep" : {"loop" : 1,"sleep" : 200000,}}}- },
- "global" : {
"default_policy" : "SCHED_FIFO","calibration" : "CPU0","lock_pages" : true,"ftrace" : true,"logdir" : "./",- }
+}
diff --git a/doc/examples/cpufreq_governor_efficiency/calibration.sh b/doc/examples/cpufreq_governor_efficiency/calibration.sh new file mode 100755 index 0000000..d10e644 --- /dev/null +++ b/doc/examples/cpufreq_governor_efficiency/calibration.sh @@ -0,0 +1,11 @@ +#!/bin/sh
+set -e
+echo performance >
/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
+sleep 1
+pLoad=$(rt-app calibration.json 2>&1 |grep pLoad |sed 's/.*=
(.*)ns.*/\1/')
+sed 's/"calibration" : .*,/"calibration" : '$pLoad',/' -i dvfs.json
diff --git a/doc/examples/cpufreq_governor_efficiency/dvfs.json b/ doc/examples/cpufreq_governor_efficiency/dvfs.json new file mode 100644 index 0000000..b413156 --- /dev/null +++ b/doc/examples/cpufreq_governor_efficiency/dvfs.json @@ -0,0 +1,27 @@ +{
- "tasks" : {
"thread" : {"instance" : 1,"cpus" : [0],"loop" : 5,"phases" : {"running" : {"loop" : 1,"run" : 100000,},"sleeping" : {"loop" : 1,"sleep" : 1000000,}}}- },
- "global" : {
"default_policy" : "SCHED_OTHER","calibration" : 90,"lock_pages" : true,"ftrace" : true,"logdir" : "./",- }
+}
diff --git a/doc/examples/cpufreq_governor_efficiency/dvfs.sh b/doc/ examples/cpufreq_governor_efficiency/dvfs.sh new file mode 100755 index 0000000..8591fc7 --- /dev/null +++ b/doc/examples/cpufreq_governor_efficiency/dvfs.sh @@ -0,0 +1,38 @@ +#!/bin/sh
+#echo $1 $2 $3 +set -e
+if [ $1 ] && [ $2 ] ; then
- for i in $(seq 0 1 $(expr $2 - 1)); do
echo $1 >/sys/devices/system/cpu/cpu$i/cpufreq/scaling_governor
#cat /sys/devices/system/cpu/cpu$i/cpufreq/scaling_governor- done
- sleep 3
+fi
+if [ $3 ] ; then
- sed 's/"run" : .*,/"run" : '$3',/' -i dvfs.json
+fi
+if [ $4 ] ; then
- sed 's/"sleep" : .*,/"sleep" : '$4',/' -i dvfs.json
+fi
+#cat dvfs.json
+rt-app dvfs.json 2> /dev/null
+if [ $1 ] ; then
- mv -f rt-app-thread-0.log rt-app_$1_run$3us_sleep$4us.log
- sum=0
- for i in $(cat rt-app_$1_run$3us_sleep$4us.log | sed 'n;d' | sed
'1d' |cut -f 3); do
sum=$(expr $sum + $i)- done
- sum=$(expr $sum / 5)
- echo $sum
- rm -f rt-app_$1_run$3us_sleep$4us.log
+fi
diff --git a/doc/examples/cpufreq_governor_efficiency/test.sh b/doc/ examples/cpufreq_governor_efficiency/test.sh new file mode 100755 index 0000000..d72fc6a --- /dev/null +++ b/doc/examples/cpufreq_governor_efficiency/test.sh @@ -0,0 +1,82 @@ +#!/bin/sh
+set -e
+set_calibration() {
- calibration.sh
+}
+test_efficiency() {
- FILENAME="results_$RANDOM$$.txt"
- if [ -e /sys/devices/system/cpu/cpu0/cpufreq/
scaling_available_governors ]; then
for i in $(cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors); do
export gov_$i=$(echo $i)done- else
echo "cpufreq is not available!"exit- fi
- if [ ! $gov_performance ] ; then
echo "Can't find performance governor!"exit- fi
- if [ ! $gov_powersave ] ; then
echo "Can't find powersave governor!"exit- fi
- # Get powersave data
- dvfs.sh powersave $1 $2 $3 > $FILENAME
- powersave=$(cat $FILENAME |sed -n '1p')
- # Get performance data
- dvfs.sh performance $1 $2 $3 > $FILENAME
- performance=$(cat $FILENAME |sed -n '1p')
- if [ $performance -ge $powersave ] ; then
echo "Error! Probably not input all the cpus in the samefrequency domain"
exit- fi
- denominator=$(expr $powersave - $performance)
- echo "powersave efficiency: 0%"
- echo "performance efficiency: 100%"
- # Calcuate other governors data
- for gov_next in $gov_conservative $gov_ondemand $gov_cfs; do
if [ "$gov_next" != "" ] ; thendvfs.sh $gov_next $1 $2 $3 > $FILENAMEdata=$(cat $FILENAME |sed -n '1p');numerator=$(expr $powersave - $data)numerator=$(expr $numerator \* 100)if [ $numerator -lt 0 ] ; thenlet numerator=0fidata=$(expr $numerator / $denominator)echo "$gov_next efficiency: $data%"fi- done
- rm -f $FILENAME
+}
+if [ $# -lt 3 ]; then
- echo "Usage: ./test.sh <cpus> <runtime> <sleeptime>"
- echo "cpus: number of cpus in the CPU0's frequency domain"
- echo "runtime: running time in ms per loop of the workload
pattern"
- echo "sleeptime: sleeping time in ms per loop of the workload
pattern"
- echo -e "\nExample: \n"./test.sh 4 100 1000" means\nCPU0~CPU3
sharing frequency, "100ms run + 1000ms sleep" workload pattern.\n"
- exit
+fi
+echo "Frequency domain CPU0~CPU$(expr $1 - 1), run $2ms, sleep
$3ms:"
+sleep 1 +PATH=$PATH:. +set_calibration +test_efficiency $1 $(expr $2 * 1000) $(expr $3 * 1000)
-- 1.9.1
-
Amit Kucheria