Barbara Nitz wrote:
I am one of those who hate UNIX on z/OS. Here's why:
2. A pain with regard to system controls.
a) USS is expected to be exempt from all controls MVS has - look at iefusi and
the huge warnings surrounding it if you *DON'T* give a USS address space
what it wants! Same holds for other things.
I can understand the reason for those IEFUSI warnings. Java! Also those
of us who compile using the C/C++ compiler in USS need a lot of memory
because the compiler is a memory hog when optimizing. It's no different
when compiling using batch.
b) Try to use WLM on one of those USS applications! We have one that
routinely runs around 65 address spaces that all wake up (timer driven) at the
same time. Having (at least) 65 tcbs ready to run on 2 cps plays havoc with
WLM PI
Please name and shame the application! Sounds like a forker. It's also
not uncommon to see Java applications using thread pools with 50 times
more threads then cpus. As soon as notifyAll is called the thundering
herd comes a running. Most of these problems are due to poor programming
practice, not necessarily the environment.
a) Just seen yesterday on WAS V6:
I tried to use the WAS console to install a IVP on our z/800. Response
times were several minutes. I guess IBM are building hardware to make it
perform (z10) just like they did back in the day for DB2. Didn't DB2
used to be a dog once?
I hate USS because architecturally it does not fit into z/OS. UNIX probably has
it uses, but not in z/OS. Just my opinion, of course.
Fair point. It's a software stack not a real kernel. I like USS because
I like *nix. I've found it to be very useful for my needs.
Barbara Nitz
----------------------------------------------------------------------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to lists...@bama.ua.edu 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 lists...@bama.ua.edu with the message: GET IBM-MAIN INFO
Search the archives at http://bama.ua.edu/archives/ibm-main.html
