Hi,
As you may know, there is some kind of performance issue because of SIIS(Store
Into Instruction Stream) after upgrade to a z13 machine in some scenarios. CPU
increase of 30% can be seen in some case, so it may be good to perform to
related changes to avoid issue from reoccuring. Did start to work on this case
since some time. Here we do talk of code written years ago, hundreds of
programs for which there is no time to rewrite them as RENT, so I am interested
to talk with any having some experience about this. More generally, dealing
with old even old code, I would like to change the code beside SIIS case to
improve the performance at execution time. I mean by using newer
instructions and optimizing the code to save some CPU cycles. Did find some
interesting documents but wanting to discuss of any scenario we can think
about. TTYL then. Philippe (philippe.cloa...@gmail.com)
