Shmuel, Blockset may resemble paging IO in the way it would track switch over a CYL as it laid down blocks, but that's probably not an advantage any more with cache all storage and CKD encapsulation into FBA. This behavior is one reason why the cache hit rate for Local Page datasets is somewhat poor, but I haven't observed how block paging behaves in polluted or small cache.
DFSORT's IO to the SORTWK are explicitly requested in response to DFSORT deciding it has exhausted its own memory. At startup it attempts to, and usually succeeds in selecting memory boundaries that avoid paging, using the SORTWK as the memory overflow area. This could be viewed as DFSORT doing its own paging, or at least its own memory management. Otherwise AFAIK DFSORT will have pages stolen and demand page with or without block paging just like any other batch job. I'm sure you know all this already, so what's your point? Ron > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of > Shmuel Metz (Seymour J.) > Sent: Thursday, March 24, 2011 6:33 AM > To: [email protected] > Subject: Re: [IBM-MAIN] Region size > > In <007001cbe921$d9fc8a30$8df59e90$@[email protected]>, on > 03/22/2011 > at 11:16 PM, Ron Hawkins <[email protected]> said: > > >ROTFLMAO! They thing demand paging will be faster than CFW to SORTWK? > >Oh the pain... > > Does DFSORT use demand paging, or does it explictly request page-ins > ahead of time? Similarly, does it wait for page stealing or does it > release pages itself? > > -- > Shmuel (Seymour J.) Metz, SysProg and JOAT > ISO position; see <http://patriot.net/~shmuel/resume/brief.html> > We don't care. We don't have to care, we're Congress. > (S877: The Shut up and Eat Your spam act of 2003) > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: GET IBM-MAIN INFO > Search the archives at http://bama.ua.edu/archives/ibm-main.html ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
