CPU usage not shown on Raspberry Pi

I have experienced exactly the same problem on a Raspberry Pi Zero W as the one desribed in https://ww.wp.xz.cn/support/topic/cpu-usages-unknow/ (marked as resolved, though it hasn’t been), i.e. CPU and core count looks like this:

Total CPUs : 0 / Cores

in the dashboard, an no proper cpu usage is displayed.

I have looked at what the shell command on

https://github.com/isaumya/wp-server-stats/blob/37a0d1ccd9ed10915fc0bdb58672d32f9aeb1bce/wp-server-stats.php#L313

produces when executed on the command line. On my desktp machine (WSL on Windows 10, Ubuntu 20.04) that looks like

$ cmd="echo \"$((<code>cat /proc/cpuinfo | grep cores | grep -o '[0-9]' | uniq<code>*</code>cat /proc/cpuinfo |grep 'physical id' | sort | uniq | wc -l

))\""
$ $cmd
"4"

But on the Raspberry Pi, the same line throws the error

$ cmd="echo \"$((<code>cat /proc/cpuinfo | grep cores | grep -o '[0-9]' | uniq<code>*</code>cat /proc/cpuinfo |grep 'physical id' | sort | uniq | wc -l

))\""
-bash: * 0: syntax error: operand expected (error token is "* 0")

which is likely to the content

$ cat /proc/cpuinfo
processor       : 0
model name      : ARMv6-compatible processor rev 7 (v6l)
BogoMIPS        : 997.08
Features        : half thumb fastmult vfp edsp java tls
CPU implementer : 0x41
CPU architecture: 7
CPU variant     : 0x0
CPU part        : 0xb76
CPU revision    : 7

Hardware        : BCM2835
Revision        : 9000c1
Serial          : 0000000009f322bb
Model           : Raspberry Pi Zero W Rev 1.1

not exhibiting any cpu cores field, differing from what the desktop machine would show for every processor.

$ cat /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 142
model name      : Intel(R) Core(TM) i5-10310U CPU @ 1.70GHz
stepping        : 12
microcode       : 0xffffffff
cpu MHz         : 2208.004
cache size      : 6144 KB
physical id     : 0
siblings        : 8
core id         : 0
cpu cores       : 4
apicid          : 0
initial apicid  : 0
fpu             : yes
fpu_exception   : yes
cpuid level     : 21
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss ht syscall nx pdpe1gb rdtscp lm constant_tsc rep_good nopl xtopology cpuid pni pclmulqdq ssse3 fma cx16 pcid sse4_1 sse4_2 movbe popcnt aes xsave avx f16c rdrand hypervisor lahf_lm abm 3dnowprefetch invpcid_single ssbd ibrs ibpb stibp ibrs_enhanced fsgsbase bmi1 avx2 smep bmi2 erms invpcid rdseed adx smap clflushopt xsaveopt xsavec xgetbv1 xsaves flush_l1d arch_capabilities
bugs            : spectre_v1 spectre_v2 spec_store_bypass swapgs taa itlb_multihit srbds
bogomips        : 4416.00
clflush size    : 64
cache_alignment : 64
address sizes   : 39 bits physical, 48 bits virtual
power management:

...

Similarly, there is no field physical id within the RPi’s cpuinfo, hence the CPU count at https://github.com/isaumya/wp-server-stats/blob/37a0d1ccd9ed10915fc0bdb58672d32f9aeb1bce/wp-server-stats.php#L296 wont’t work neither.

For similar reasons, determining the cpu load at https://github.com/isaumya/wp-server-stats/blob/37a0d1ccd9ed10915fc0bdb58672d32f9aeb1bce/wp-server-stats.php#L609 won’t work neither.

Summing up, if one would want to have the CPU count and load displayed proprly on a Rasberry Pi, the way to gou would be to clone the git repository and apply platform-specific modifications to the three lines of code linked above.

Best,

Johannes

• This topic was modified 5 years, 4 months ago by jotelha.