[erlang-questions] scheduler usage vs cpu usage

[Shian Wu]

Hi

Thanks for your reply.

How do I find out which os resource block vm?
My iowait is also not so high and no network traffic.

Thanks
---
Shian Wu



On Mon, Jul 7, 2014 at 11:45 PM, Björn-Egil Dahlberg <egil@REDACTED>
wrote:

>  On 2014-07-07 17:17, Shian Wu wrote:
>
>  Hi
>
>  I call recon:scheduler_usage(5000) when cpu usage is low (100% ~ 200%
> from top, with 32 cores)
> It show all scheduler usage is 1.0
>  Is this possible? all schedulers are busy but cpu usage is low
>
>
> Yes, it is possible.
>
> Schedulers waiting for os resources are considered utilized (they cannot
> handle more work).
>
> This is why scheduler utilization exists. CPU utilization is often used as
> a load measuring device but it is a very poor estimate load.
> Scheduler utilization is a better estimate.
>
> // Björn-Egil
>
>
>  thanks
>   ---
> Shian Wu
>
>
>
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