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autocore: optimize the performance of obtaining CPU temperature

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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>
[adjusted for our own tree]
Signed-off-by: CN_SZTL <cnsztl@project-openwrt.eu.org>
This commit is contained in:
Chuck 2021-02-18 19:38:06 +08:00 committed by CN_SZTL
parent 75d4e97c4f
commit 5f075d8aca
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1 changed files with 1 additions and 1 deletions
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package/lean/autocore/files/arm/cpuinfo
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@ -23,7 +23,7 @@ elif grep -q "ipq40xx" "/etc/openwrt_release"; then
cpu_temp="$(sensors | grep -Eo '\+[0-9]+.+C' | sed ':a;N;$!ba;s/\n/ /g;s/+//g')"
else
[ -e "/sys/class/thermal/thermal_zone0/temp" ] && \
cpu_temp="$(awk "BEGIN{printf (\"%.1f\n\",$(cat "/sys/class/thermal/thermal_zone0/temp")/1000)}")°C"
cpu_temp="$(awk '{printf("%.1f°C", $0 / 1000)}' /sys/class/thermal/thermal_zone0/temp)"
fi
if [ -z "${cpu_freq}" ] && [ -z "${cpu_temp}" ]; then