On Fri, 2 Mar 2007 11:02:38 -0600, Debbie Mitchell wrote:
>
> Thank you all for your clarification. A coworker was trying to run an IVP
> and the only way he knew how to do anything in OMVS/USS was through ishell.
> When it wasn't working, I got caught up in this tangent. Now at least I
> understand a little better what ishell does/doesn't do well and I will share
> the info with my coworker.
>
I observe another difference between native, OMVS, and ISHELL:
performance. Apparently ISHELL runs a login shell, and thus
my ~/.profile for each command. My .profile is admittedly somewhat
bloated -- I share it among several distinct systems. I timed it
by simply inserting a "date" command at the top and the bottom.
So, the numbers:
Native z/OS shell: 7 seconds
3270 OMVS: 7 seconds
ISHELL: 240 seconds
(The first time I tried it native, it was 13 seconds. I can
conjecture this is time to mount filesystems. The 240 seconds
is remarkably repeatable: it hardly varies 1%.)
So, why is ISHELL so much slower.
I suspect what would really help your coworker is a file menu,
similar to DSLIST or DDLIST, which could run under OMVS with a 327x
display. This could react properly to the cd's, env's, umask's,
su's, etc., at least as they were on entry to the menu. It would
be even better if the menu were made a builtin command, so changes
made under the menu would persist on return to line mode. Sounds
to me like an opportunity for a Requirement.
-- gil
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