Since the origin for the starting post apparently lay in branching around the eyecatcher (which really is not necessarily at all the same as a branch in a 2 instruction loop), I was surprised that none of the posts that I glanced at mentioned Instruction-cache misses.
Just because you think something is high frequency does not mean that the operating system or the machine agrees with you. If the module's first instruction is not in I-cache, then whether that first instruction is a branch or anything else, it will show up as a lot hotter than a somewhat similar instruction that is in the I-cache. Peter Relson z/OS Core Technology Design ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
