Well I dunno, we ran with ZVM 95-100% CPU far more than I was comfortable with, and zlinux prod kept ticking, while non-prod got choked out above 95%. That sure seemed like mission accomplished at the time. But we had a rather standard Java workload across the board, and perhaps more a more complex workloads and larger numbers of guests changes things.
That said, I acknowledge your expertise, and value to this forum Barton! -----Original Message----- From: Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] On Behalf Of Barton Robinson Sent: Wednesday, October 28, 2015 11:30 AM To: LINUX-390@VM.MARIST.EDU Subject: Re: Help with cpu stealing No, please don't do this. Having weights in the 1000's is what causes this problem, creates excess share, the looping user takes over. If you don't understand excess share, keep shares in the 100's, and use absolute shares where you know exactly what is intended. On 10/28/2015 7:13 AM, Veencamp, Jonathon D. wrote: > It is a somewhat crude method, but we used SHARE values on the directory > entry for the guests. > > prod hosts would have SHARE weights in the thousands, and dev hosts would > have SHARE weights in the tens or hundreds. > Non-prod could pull hard as long as we weren't at capacity, but with any CPU > contention prod would "win" dramatically, and non-prod would be CPU > constrained by ZVM. > > As I said crude, and that strategy it depends what you have running. > > Jon > > From: Victor Echavarry Diaz <vechava...@evertecinc.com> > To: LINUX-390@VM.MARIST.EDU > Date: 10/28/2015 09:28 AM > Subject: Help with cpu stealing > Sent by: Linux on 390 Port <LINUX-390@VM.MARIST.EDU> > > > > Hi people: > > We've had several incidents where one Linux server has high CPU > utilization and impacts other servers from other applications. We were > asked to prevent this from happening again so we are looking for the best > practices to avoid CPU stealing or CPU waits on one Linux server caused by > another. > > Regards, > > Victor Echavarry > System Programmer, EVERTEC LLC > > > > ________________________________ > > This e-mail message and any attachments are confidential and meant for the > exclusive use of the intended recipient or addressee. The message may also > contain protected health information or personally identifiable information, > both protected by state and federal law. PLEASE NOTE: The misuse of protected > health information could subject you to civil or criminal penalties. If you > have received this communication in error, please do not read it and notify > the sender immediately by reply e-mail at the address above and permanently > delete/destroy all copies of the message and all attachments. 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