When I was in DFSORT, I always recommended not using VIO for sort work data sets. We felt it was better to let DFSORT manage the use of storage for intermediate work space via Hiperspace, Memory Object or Dataspace. One advantage was that DFSORT has controls over the total memory usage by concurrent sort applications.
I believe VIO is still something worth exploiting for other types of temporary data sets given the larger storage configurations available today. However, keep in mind that there are also some limitations to VIO such as not supporting large format data sets. Have a nice day, Dave Betten z/OS Performance Specialist Cloud and Systems Performance IBM Corporation email: [email protected] IBM Mainframe Discussion List <[email protected]> wrote on 05/11/2016 11:10:55 AM: > From: Martin Packer <[email protected]> > To: [email protected] > Date: 05/11/2016 11:12 AM > Subject: Re: Whither VIO? > Sent by: IBM Mainframe Discussion List <[email protected]> > > I said in another thread that VIO was one of the worse DIM exploiters for > CPU usage - in the Orange "Coffee Table" book of DIM studies way back > when. > > I've no reason to doubt it now. I would still expect that for many uses it > is faster than temporary data sets on disk, though. > > So I would question what we're optimising for. > > And I would agree that a rival implementation - such as hiperspace or > 64-Bit Memory Object sorting - is worth investigating. > > Cheers, Martin > > Martin Packer, > zChampion, Principal Systems Investigator, > Worldwide Cloud & Systems Performance, IBM > > +44-7802-245-584 > > email: [email protected] > > Twitter / Facebook IDs: MartinPacker > > Blog: > https://www.ibm.com/developerworks/mydeveloperworks/blogs/MartinPacker > > Podcast Series (With Marna Walle): > https://developer.ibm.com/tv/category/mpt/ > > > > From: "Vernooij, CP (ITOPT1) - KLM" <[email protected]> > To: [email protected] > Date: 11/05/2016 15:32 > Subject: Re: Whither VIO? > Sent by: IBM Mainframe Discussion List <[email protected]> > > > > I heard rumors that VIO is that CPU expensive and that I/O is that fast > nowadays, that it is VIO is not worth the extra CPU anymore. > > Therefor I have been thinking about abandoning VIO, but I can't make a > good calculation. I could make the calculation for the SAS WORK file, > which can be in VIO or in HIPERSPACE. The latter is cheaper, as is stated > by SAS and it is easy to switch to Hiperspace with a simple installation > parameter. > > Does anyone has some figures on other use of VIO? > > Kees. > > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:[email protected]] On > Behalf Of Martin Packer > Sent: 11 May, 2016 16:08 > To: [email protected] > Subject: Re: Whither VIO? > > The nasty answer to "what happened to VIO?" is "nothing". :-) :-( > > Seriously, it remains as before but implemented in central storage rather > than expanded. > > With the improved economics of memory it's worth looking at again - but > only if memory is available to support it. > > Cheers, Martin > > Martin Packer, > zChampion, Principal Systems Investigator, > Worldwide Cloud & Systems Performance, IBM > > +44-7802-245-584 > > email: [email protected] > > Twitter / Facebook IDs: MartinPacker > > Blog: > https://www.ibm.com/developerworks/mydeveloperworks/blogs/MartinPacker > > Podcast Series (With Marna Walle): > https://developer.ibm.com/tv/category/mpt/ > > > > From: Lizette Koehler <[email protected]> > To: [email protected] > Date: 11/05/2016 14:55 > Subject: Re: Whither VIO? > Sent by: IBM Mainframe Discussion List <[email protected]> > > > > My guess would be: > > DASD is faster > Virtual Tape is faster > Central Memory is plentiful (for some shops) > > Lizette > > > > -----Original Message----- > > From: IBM Mainframe Discussion List [mailto:[email protected]] On > > Behalf Of Jerry Callen > > Sent: Wednesday, May 11, 2016 6:51 AM > > To: [email protected] > > Subject: Whither VIO? > > > > In a thread in a distant galaxy, J.O.Skip Robinson wrote: > > > > > ...be aware that some customers (like us) did away with VIO a long > time ago. > > > > I've been away from MVS for a while. Did something better than VIO come > along > > while I wasn't looking? Why would VIO have been vaporized? > > > > -- Jerry > > > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN > > > > Unless stated otherwise above: > IBM United Kingdom Limited - Registered in England and Wales with number > 741598. > Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN > ******************************************************** > For information, services and offers, please visit our web site: > http://www.klm.com. 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