Re: load average calculation failing -- fixed by Windows update

[Jon Turney <jon.turney@dronecode.org.uk>]

On 12/05/2022 10:48, Corinna Vinschen wrote:
> On May 11 16:40, Mark Geisert wrote:
>>
>> The first counter read now gets error 0xC0000BC6 == PDH_INVALID_DATA, but no
>> errors on subsequent counter reads.  This sounds like it now matches what
>> Corinna reported for W11.  I wonder if she's running build 1706 already.
> 
> Erm... looks like I didn't read your mail throughly enough.
> 
> This behaviour, the first call returning with PDH_INVALID_DATA and only
> subsequent calls returning valid(?) values, is what breaks the
> getloadavg function and, consequentially, /proc/loadavg.  So maybe xload
> now works, but Cygwin is still broken.

The first attempt to read '% Processor Time' is expected to fail with 
PDH_INVALID_DATA, since it doesn't have a value at a particular instant, 
but one averaged over a period of time.

This is what the following comment is meant to record:

"Note that PDH will only return data for '% Processor Time' after the 
second call to PdhCollectQueryData(), as it's computed over an interval, 
so the first attempt to estimate load will fail and 0.0 will be returned."