Re: How many Intel cores does an IFL emulate

*All* resources have cost attributes. I'm quite sure Netflix, for example, spends a huge sum on computing resources, although to my knowledge they don't have a mainframe -- at least not one of their own. (Maybe they should!) I would also point out that the world's top wealthiest people often

Re: How many Intel cores does an IFL emulate

Thank you for clarifying the threadability of an IFL CP. I worked w/ a fellow who went to work in one of the labs in Vermont working on "hyperthreading" for the pSeries CPUs... I seem to recall him talking about efforts for the zSeries CPs but that seemed a long ask. -soup On Wed, Nov 8, 2017

Re: How many Intel cores does an IFL emulate

z/OS supports ZIIPs with SMT-2 as well. -Original Message- From: Alan Altmark [mailto:alan_altm...@us.ibm.com] Sent: Wednesday, November 8, 2017 5:52 PM To: LINUX-390@VM.MARIST.EDU Subject: Re: How many Intel cores does an IFL emulate Thanks for advertising, Soup! :-) In fact, IFLs

Re: How many Intel cores does an IFL emulate

Thanks for advertising, Soup! :-) In fact, IFLs are the only engines on Z that have SMT-2, where each core in the LPAR splits in two, appearing to the host as twice the number of CPUs. Alan Sent from my iPhone using IBM Verse On Nov 8, 2017, 8:36:39 PM, soup...@gmail.com wrote:

Re: How many Intel cores does an IFL emulate

Come to think of it, I think an IFL is a single zSeries core. z/VM can fake it, though that's "overcommitting" the CPU resource. Despite my NOT looking at the zSeries Principles of Operation I somehow doubt the zSeries has hyperthreading... as the z/VM OS would be dispatch threads. On the

Re: How many Intel cores does an IFL emulate

On Wednesday, 11/08/2017 at 09:55 GMT, Philipp Kern wrote: > I thought unused CP capacity was literally costing OpEx whereas IFLs > would be CapEx? If it's both OpEx, then yes, agreed. (And I suppose > originally there might have been deals about giving some IFLs with >

Re: How many Intel cores does an IFL emulate

Hi, On 08.11.2017 16:42, Alan Altmark wrote: > On Wednesday, 11/08/2017 at 03:17 GMT, Philipp Kern > wrote: >> I idly wonder how actual utilization of IFLs looks like in the field. >> It's clear to me that CPs run hot because otherwise you're wasting >> moneys. I.e. if

Re: How many Intel cores does an IFL emulate

On Wednesday, 11/08/2017 at 03:17 GMT, Philipp Kern wrote: > I idly wonder how actual utilization of IFLs looks like in the field. > It's clear to me that CPs run hot because otherwise you're wasting > moneys. I.e. if overcommitment is just a fact of life like it is in the >

Re: How many Intel cores does an IFL emulate

Victor, As others have mentioned, it depends. I often get asked the same question and usually they want to compare one intel server/application against an IFL based solution. But without understanding the load characteristics of the application it's next to impossible to give a clear answer. Even

Re: How many Intel cores does an IFL emulate

and my two cents: 1) don't forget that energy efficiency and hence cost is yet another factor for comparison. Scaled up, Z does rather well in this respect. 2) CICS vs RISC: the distiction is so blurred that to even talk in these terms is difficult. Most Z instructions are implemented in H/W. We