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optimize the performance of obtaining CPU temperature (#6398)

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Preformance Test (on NanoPi R2s, repeat 1000 times):

old command:

temp="$(awk "BEGIN{printf (\"%.1f\n\",$(cat /sys/class/thermal/thermal_zone0/temp)/1000) }")°C"

```
real    0m 9.20s
user    0m 3.29s
sys     0m 6.24s
```

new command:

temp="$(awk '{ printf("%.1f °C", $0 / 1000) }' /sys/class/thermal/thermal_zone0/temp)"

```
real    0m 5.57s
user    0m 1.78s
sys     0m 3.97s
```

Signed-off-by: Chuck <fanck0605@qq.com>
This commit is contained in:
Chuck 2021-02-21 12:27:55 +08:00 committed by GitHub
parent aaba169f2f
commit e17961f67e
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1 changed files with 1 additions and 1 deletions
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package/lean/autocore/files/arm/sbin/cpuinfo
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@ -17,7 +17,7 @@ fi
if grep -q "ipq40xx" "/etc/openwrt_release"; then
sys_temp="$(sensors | grep -Eo '\+[0-9]+.+C' | sed ':a;N;$!ba;s/\n/ /g;s/+//g')"
else
sys_temp="$(awk "BEGIN{printf (\"%.1f\n\",$(cat /sys/class/thermal/thermal_zone0/temp)/1000) }")°C"
sys_temp="$(awk '{ printf("%.1f °C", $0 / 1000) }' /sys/class/thermal/thermal_zone0/temp)"
fi
echo -n "${cpu_arch} x ${cpu_cores} (${cpu_freq}, ${sys_temp})"