Re: Possible reasons for load average high and CPU 90% idle on RHEL 7.6

Thanks Mikhail.

Thanks,
Goti

On Mon, Aug 23, 2021 at 5:17 PM Mikhail Velikikh <mvelikikh_at_gmail.com> wrote:

> Hi,
>
> Linux load averages include processes in the uninterruptible sleep (D)
> state (disk I/O wait usually):
> https://www.brendangregg.com/blog/2017-08-08/linux-load-averages.html
>
> You can check historic sar -d for avgqu-sz. It can get ridiculously high
> if you have lots of processes waiting for I/O.
>
>
> On Mon, 23 Aug 2021 at 12:29, Goti <aryan.goti_at_gmail.com> wrote:
>
>> HI Listers,
>>
>> We had a situation where the load average spiked to more than 2000+ and
>> continued the saw way for about 45 minutes. During this entire time we had
>> CPU 95% idle. One thing that was observed was that we had a sudden increase
>> in the number of connections from 1800 to around 3700. We had 90Gb of free
>> memory throughout when the load average spiked.
>>
>> Server has 48 CPU with 512 Gb of RAM running on RHEL 7.6.
>>
>> Is this something expected?
>>
>>
>> Thanks,
>> Goti
>>
>

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