6.1 added Adaptive Code Generation (ACG), which allows programs created
or converted on newer hardware to immediately leverage new features,
without requiring a performance penalty when run on older hardware. No
program conversion is required within a release when one moves programs
from an older processor technology, e.g. POWER5, to a newer technology,
like POWER6. One-time conversion is done if a program created or
converted on a POWER6-based system is moved to a POWER5-based system
running 6.1. The conversion occurs automatically when such a program is
first called, if the conversion has not been done earlier, during
restore or with a CHG* command.
Mark Waterbury previously referenced Redpaper REDP-4293, “i5/OS Program
Conversion: Getting ready for i5/OS V6R1”, at
. I highly
recommend it for answering many questions about moving to 6.1 and for
helping alleviate concerns. The Redpaper also includes information about
Some readers may also find this program conversion article helpful:
To complicate further, V6R1 non-POWER to V6R1 POWER may effect
some implicit conversions to take advantage of POWER-specific
features. Similarly for the reverse. There is no method of
detection provided as from pre-V6R1 to V6R1+. Thus it is best to
move to a POWER systems hardware for V6R1. AFaIK the implicit
conversion will transpire irrespective of any system value or RSTxxx
"force conversion" option settings.
IBM i Licensed Internal Code development
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