Re: Question on TIMI implementation.

John,

Note that the pSeries doesn't support any of this. Its an iSeries only
thing. In fact, its one of the things that makes the System i so cool.
I'll assume the pSeries in your message was a typo, but don't do it again!
<grin>

The Inside the AS/400 book mentioned before will have more details, but
basically when you compile a ILE or OPM program, the intermediate form of
the program is stored in the actual program object along with the executable
form that uses actual hardware instructions. This allows the system to
re-translate (convert) the program when nescessary. This usually occurs
during SAVE/RESTORE of the program, first use of the program, or when you
explictly as for it to occur.

This came in handy when the box went from 48-bit CISC processors to 64-bit
RISC processors.

Today in fact, with IBM i 6.1, programs have to be converted to run at 6.1
if they weren't compiled on 6.1. Also, if you compile on a POWER6 box at
6.1 and retsore the program to a POWER5 v5r4 box, the program will be
converted.


HTH,
Charles


On Fri, Dec 12, 2008 at 11:04 AM, McKown, John <
John.Mckown@xxxxxxxxxxxxxxxxx> wrote:

I don't know if I understand the following paragraph that I got from
IBM's web site:

<quote>

Traditional System i applications run under a model known as IBM
Integrated Language Environment(r) (ILE). This model allows C/C++, RPG,
CL and COBOL applications to easily call functions from, and share data
with, each other through interaction that occurs at the TIMI level.
Above the TIMI, all programs compile to an intermediate form that is
automatically translated into actual hardware instructions by the SLIC
kernel prior to execution. ILE applications are not interpreted.

</quote>

To me, the last sentence is saying that the program compiled to the
TIMI. But when the program is loaded for execution, the TIMI
instructions are transparently converted (compiled) to pSeries
instructions and then that temporary copy of the program is actually run
"natively" (without using a emulator). As opposed to the program being
loaded for execution and a TIMI emulator in "firmware" then running the
program by reading each TIMI instruction and executing the necessary
pSeries instructions.

Hope my question makes sense.

John McKown

Systems Engineer IV

IT



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