On 18/06/2020 1:43 am, Paul Gilmartin wrote:
On Wed, 17 Jun 2020 09:24:58 -0500, Kirk Wolf wrote:
I wasn't thinking of using the "all members" form of cp ...
I'm curious - how much time did you save by preallocating the PDS?
I'm mystified that it made a difference since Lionel never used the allocate
"dd" in the call to "cp". Only SVC 99 knows.
I was doing some testing on this last week. The overhead appears to be
obtaining and freeing the enqueue on the PDS for each member. If you
already have a SHR enqueue this is bypassed. The cp command needs to run
in the same address space that obtained the enqueue.
--
Andrew Rowley
Black Hill Software
----------------------------------------------------------------------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
