Hal Merritt wrote:
I would think that JES is something of a special case. It does I/O for a
living and I would imagine it has gotten pretty good at it over the
decades.
For example, I don't really know, but it might be reasonable for JES to
manage device queuing internally and therefore not be visible to
ordinary measuring tools.
Perhaps reasonable. But, at least for JES2, not the case. As of z/OS
1.4, they use EXCPVR just like other access methods. (Be happy. It used
to be plain old EXCP!)
JES3 still uses STARTIO and a seldom-ending channel program.
--
Edward E Jaffe
Phoenix Software International, Inc
5200 W Century Blvd, Suite 800
Los Angeles, CA 90045
310-338-0400 x318
[EMAIL PROTECTED]
http://www.phoenixsoftware.com/
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