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optimize the performance of obtaining CPU usage (#6399)

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

old command

cpu_usage=$(expr 100 - $(cat /tmp/top_tmp | grep 'CPU:' | awk -F '%' '{print$4}' | awk -F ' ' '{print$2}'))

```
real    0m 14.25s
user    0m 7.96s
sys     0m 20.33s
```

new command

cpu_usage=$(cat /tmp/top_tmp | awk '/^CPU/ { printf("%d%%", 100 - $8) }')

```
real    0m 6.91s
user    0m 4.29s
sys     0m 6.06s
```

Signed-off-by: Chuck <fanck0605@qq.com>
This commit is contained in:
Chuck 2021-02-21 12:26:19 +08:00 committed by GitHub
parent 7436d6866f
commit aaba169f2f
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package/lean/autocore/files/arm/index.htm
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@ -48,7 +48,7 @@
local user_info = luci.sys.exec("cat /proc/net/arp | grep 'br-lan' | grep '0x2' | wc -l")
local cpu_usage = (luci.sys.exec("expr 100 - $(top -n 1 | grep 'CPU:' | awk -F '%' '{print$4}' | awk -F ' ' '{print$2}')") or "6") .. "%"
local cpu_usage = luci.sys.exec("top -n1 | awk '/^CPU/ { printf(\"%d%%\", 100 - $8) }'") or "6%"
local cpu_info = luci.sys.exec("/sbin/cpuinfo") or "ARM Processor x 0 (233MHz, 2.3°C)"
local rv = {