Re: Debug (was Look-ahead function)

[Hans Boldt <boldt@xxxxxxxxxx>]

>Can you tell what are the other differences between DBGVIEW - *SOURCE
>and *LIST besides *SOURCE using the current source member.
>
>1.  Is one better than the other?

Well, as we've seen already, using DBGVIEW(*LIST) allows you to debug
a program on a system other than where you compiled the program.

>
>2.  Does *LIST make the programs size awfully big?  Does it keep all
>the /copy, ext ref etc.?

Well, yes.  TANSTAAFL!  I tried compiling one of my programs and found
the following sizes:
 DBGVIEW(*NONE)  200704
 DBGVIEW(*SOURCE) 258048
 DBGVIEW(*LIST)  380928
So, from this example, count on a program size roughly double.

>
>3.  Do they make a difference in the program load time?

No, the debug tables are used only by debug.

>
>4.  Does the new H options *SRCSTMT, *NODEBUGIO behave differently
>with the two options?

No difference.

>
>5.  Which one takes longer to compile? (I found the *LIST longer but
>my mileage maybe fake...)

Since a bigger program is produced, it's reasonable to count on
somewhat longer compile time.  But I don't have any numbers to indicate
what the difference is.

>
>6.  In the same note, on CISC (poor V3R2 types), is it better to have
>the optimize set to *NONE or  *BASIC or *FULL

See below.

>
>7.  Which optimize option creates the module faster?  (I have tried all
>the three and get no meaningful difference.)

In general, most RPG programs are I/O bound.  As a result, optimization
doesn't really make much difference for RPG.  In addition, in order to
make RPG programs run properly, most of the really aggressive optimizations
are disabled by RPG.  As a result, for most typical RPG programs, compile-
time and run-time should be roughly the same.

Hans Boldt, ILE RPG Development, IBM Toronto Lab, boldt@ca.ibm.com
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