CPU usage is always 0

[zhouhuirun2015]

[zhouhuirun2015]

windows server 2016 x64 standard with GUI
E5-2630v4
16GB

[soyuka]

Can you try to execute:

wmic PROCESS where ProcessId=YOUR_PID get CreationDate,KernelModeTime,ParentProcessId,ProcessId,UserModeTime,WorkingSetSize

[zhouhuirun2015]

The result is:
C:\Windows\system32>wmic PROCESS where ProcessId=5896 get CreationDate,KernelModeTime,ParentProcessId,ProcessId,UserModeTime,WorkingSetSize
CreationDate KernelModeTime ParentProcessId ProcessId UserModeTime WorkingSetSize
20180714110222.629168+480 5375468750 5060 5896 25893281250 59334656

I use win32 exe which I compiled to get child process cpu usage, but it seems that child_process exec function return wrong pid.If I exec the win32 exe in CMD, it return the right result.

Here is the win32 exe code:

CpuUsage.txt

[soyuka]

The result looks correct to me, maybe try to call the usage a couple of times, the measure should settle with time.
I like your C++ code though, maybe it's faster then wmic. If we could make this as a node binding for windows it'd be awesome.

[zhouhuirun2015]

I call the cpuUsage every 10 secs, it always return 0.but the wmic exec result is right.So maybe the problem is child_process exec func return wrong pid?

[soyuka]

You could debug the where clause here. I don't have access to a windows machine (especially no 2016 server edition), therefore I'm not sure how I could be able to help you...

[blamay]

I'm also experiencing this issue. It used to work, or at least for some of the PIDs, but it suddenly stopped working for all of them. Currently trying get it back to semi-working again to see if I can find a repro case.

EDIT: My solution was to check for cpu == 0 and retry until it showed correctly. It seems to happen every time at the beginning after the processes are first started.

[zarda]

My OS is ubuntu, the cpu usage still be 0 after a long time. ctime is very small, which is less than 1 ms.