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autocore: optimize the performance of obtaining CPU usage

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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>
[adjusted for our own tree]
Signed-off-by: CN_SZTL <cnsztl@project-openwrt.eu.org>
This commit is contained in:
Chuck 2021-02-18 20:08:26 +08:00 committed by CN_SZTL
parent 6ada9d5252
commit 2908424223
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GPG Key ID: 6850B6345C862176
2 changed files with 2 additions and 2 deletions
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2
package/lean/autocore/files/arm/rpcd_luci
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@ -644,7 +644,7 @@ local methods = {
local sys = require "luci.sys"
local cpuusage = {}
cpuusage.cpuusage = (sys.exec("expr 100 - $(top -n 1 | grep 'CPU:' | awk -F '%' '{print$4}' | awk -F ' ' '{print$2}')") or "2.33") .. "%"
cpuusage.cpuusage = sys.exec("top -n1 | awk '/^CPU/ {printf(\"%d%%\", 100 - $8)}'") or "6%"
return cpuusage
end
},

2
package/lean/autocore/files/x86/rpcd_luci
View File

@ -644,7 +644,7 @@ local methods = {
local sys = require "luci.sys"
local cpuusage = {}
cpuusage.cpuusage = (sys.exec("expr 100 - $(top -n 1 | grep 'CPU:' | awk -F '%' '{print$4}' | awk -F ' ' '{print$2}')") or "2.33") .. "%"
cpuusage.cpuusage = sys.exec("top -n1 | awk '/^CPU/ {printf(\"%d%%\", 100 - $8)}'") or "6%"
return cpuusage
end
},