On Sunday, September 1, 2019, 08:31:39 PM PDT, Paul Gilmartin
<[email protected]> wrote:
>> As for IBM C having several deficiencies, remember that z/OS is a
>> very complex OS compared to Unix where 1 size fits all.
> Simpler is better.
I never said Unix was simple for programmers. Instead of complexity being in
the OS, Unix relies on the programmer taking care about every minor detail.
E..g. security, optimization and much more. How many people realize that a z/OS
sysplex is a private cloud without any modifications? IBM has never advertised
it as cloud. In Unix, you must enable your code to use cloud services (e.g.
SaaS, PaaS, FaaS or ???).
>> I would hope that on z/OS, 2GB is sufficient for most programs.
>> If not, how are you going to get 1000 users on a single machine?
>Virtual Storage?
Of course virtual storage. Do the math (1000 * 2GB = 2TB). For Unix, the rule
of thumb for paging is 2X ram. 3 X 128GB is 384GB (20%). I haven't been on z/OS
in a long time, so I'm guessing.
The fortunate thing with z/OS is that you could tell the programmer to use a
file and this file could exist in memory or on media appropriate for the
application. In Unix, you must change the application to fix it.
Jon.
----------------------------------------------------------------------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to [email protected] with the message: INFO IBM-MAIN
