On Oct 9, 2007, at 2:06 PM, Edward Jaffe wrote:
Ed Gould wrote:
Not speaking for Rick, but in agreement with him. As he mentioned
the viability of putting into production a $$ tool . I have seen
various programmers try to put various debugging tools into
production and have seen it slip by (into production once or
twice) don't go there. Being called (as a sysprog) at xx AM
because the tool doesn't work or its causing production stoppage
is not fun and it gets really nasty when it comes to politics at
someone else on the list says BTDTGTS . IF you let the tool run
loose heaven help you if the tool expires at xx AM and trying to
get a hold of the vendor that does 9-5 in another time zone or
even worse in on the other side of the pond (Atlantic or Pacific).
NO THANKS and another BTDTGS.
What Dave was trying to say was that z/XDC is not linked with or
installed with your code at all. The risks you allude to don't exist.
When you decide you want to debug a program, you can HOOK it on the
fly (even if it hasn't been LOADed yet). The debugger dynamically
overlays part of your program with a sequence of instructions that
allows it to gain control and pause your program. After it gets
control, it restores the instructions that were there to begin
with. Then, you can step through your program instruction-by-
instruction and, if you keep your ADATA around for the module being
debugged, you can even use full source-level debugging (like
stepping through an assembler source listing). You can change
registers on the fly, change data on the fly, change instructions
on the fly, take branches, don't take them, jump anywhere in the
code ... you name it!
Ed,
In this case maybe but I have seen this happen with other products (3
come to mind) . One was dynamic but it depended on other software in
CICS to get it to work. The CICS (batch or CICS) "debugger" was
very MVS release dependent, often the issues did not show up until
the system was heavily loaded. I am extremely suspicious of any
debugger that makes claims. I have heard lots of good stuff about the
product, but until I have witnessed it personally I will reserve
judgement.
Ed
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