Re: Jobs using over 100% CPU -- MIDRANGE-L

And the maximum you can get on POWER8 and POWER9 would be 2,000%. This comes from the minimum allocation being 0.05 of a core. So if allocated for that, and uncapped as Jim says, then if you consume a full core WRKSYSSTS and WRKACTJOB will report 2,000%. Well they would but they show ++++ due to display space limitations. :-)

This occurs for example every time you start the *ADMIN web server. :-)
- DrF

On 5/18/2021 7:31 AM, Jim Oberholtzer wrote:

Vern, not quite. In IBM i’s case:

Say a partition is set up for 0.1 cores, and uncapped.

If the software in that partition calls for more CPU than 0.1 the it will show percent CPU above 100%. So in Brads case he was pulling 9 times the allocation of his partition set up.

If a partition is capped, it will never show more than 100% since the system was told not to allow that.

The percent of CPU is roughly a measure of the allocated CPU to that partition. So if you have a partition with four cores assigned, it shows the percentage of all four cores, or with micro partitions less than one core.

I don’t have a clue what happens with other systems.

Jim Oberholtzer
Agile Technology Architects

On May 17, 2021, at 9:46 PM, Vern Hamberg <vhamberg@xxxxxxxxxxxxxxx> wrote:

Jim, I think I heard, and you seem to say, that each core - is that the right unit - gives 100%, so 2 of them give a total of 200%? I just read something that said if 3 cores are each at 60%, the reported percentage would be 180%? It seems this multiple-core reporting is not unique to the IBM i - it applies to laptops, workstations - my laptop has 2 cores, 4 logical processors (this doesn't matter, right?). Although the performance tab of Task Manager looks like it has a max of 100%, I've seen more than that there.

Regards
Vern

On 5/17/2021 6:55 PM, Jim Oberholtzer wrote:
It’s not overclocking. The partition is set up uncapped, so it will use as much CPU as it can, unless the other partitions are asking for their share.

They did you a huge favor setting it up that way. I’d let it be…

Jim Oberholtzer
Agile Technology Architects

On May 17, 2021, at 6:52 PM, Brad Stone <bvstone@xxxxxxxxx> wrote:

I just ask. It's a 15 partition hosted system. They only use one
partition.

Is there some maths to do in the calculation when working with multiple
LPAR systems when we see over 100%? 900% seems like some serious
overclocking. :)

On Mon, May 17, 2021 at 4:31 PM Jon Paris <jon.paris@xxxxxxxxxxxxxx> wrote:

How many partitions on the box Brad. This happens quite often for us when
we run a CPU intensive process when no other partitions are in use.

Jon Paris

On May 17, 2021, at 5:10 PM, Brad Stone <bvstone@xxxxxxxxx> wrote:

I have a customer who is reporting that the CPU for some jobs is over

100%

for a period of time.

WAS90SVR 875.39%
QINAVMNSRV 135%
QNPSERVS 900.28%

I'm guessing the first is a webserver job and the other two are system
jobs, obviously.

It's only for a short time during the night that this seems to happen.

All

other job CPUs (calculated using CPU time and elapsed time) show exactly
the same as what shows on WRKACTJOB.

Of course, since this was at night they weren't able to compare these 3
jobs on WRKACTJOB.

I know I've seen ++++ before for CPU percentage... but these seem odd.

I do know that there seems to be issues with the list jobs API on this
system to as it will return multiple instances of the same job from time

to

time in the active job list (not using SQL, using the API).

Bradley V. Stone
www.bvstools.com
Native IBM i e-Mail solutions for Microsoft Office 365, Gmail, or any

Cloud

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