Re: jobs running in one subsystem take up more CPU then rest of jobs

[Kirk Goins <kgoins@xxxxxxxxxxx>]

John Allen wrote:
> I know this question will probably have multiple answers including "it
> depends"
>
>  
>
> If we have a subsystem setup to run a set of specific batch jobs. And these
> jobs are running at the default batch job run priority of 50 
>
> (subsystem setup with normal default values you get when subsystem is
> created and the SBMJOB does not have anything but the default values
> specified)
>
>  
>
> The interactive jobs are running at the default priority of 10
>
>  
>
> Why do the Batch jobs (there are 5 of them total running in the subsystem)
> seem to be taking up to 60-70% of CPU while the interactive jobs are taking
> .5 - 1% each
>
> Or is this nothing to worry about, the System i will adjust resources as
> necessary to keep the interactive response time unaffected by batch jobs?
>
>  
>
> I do not have users complaining about slow response times (yet) I just
> noticed this and it got me wondering why is this?
>
> And who knows if it continues they may start calling me.
>
>  
>
> Also, is there something I can easily so to reduce the CPU% the batch jobs
> are taking?
>
> Tmeslice, or memory or anything else?
>
>  
>
> Thanks
>
> John
>
>   
John,

Do you have Performance Tools installed or know how to use the Monitors 
in iNav to watch system performance?  I think your next step would be 
look at the Interactive Response Times the users are seeing.  If the CPU 
is running 70% and the Interactive users are still seeing sub-second 
response times... things are OK. They are getting all the resources they 
need.