memory – Mainframe, Performance, Topics

Framed

Increasingly customers are using 1MB and 2GB page frames. Recent experiences with them managing these areas have led me to writing this post. It’s about the two LFAREAs. 1 In the following I’m going to prefer to say “page” instead of “page frame” – unless the meaning would be unclear. What Is The Point OfContinue reading “Framed”

Memories Are Made Of This

Wouldn’t you like to know where in the machine an LPAR’s memory is? Perhaps not but for some customers it’s more than a matter of idle curiosity. The good news is that RMF will be able to tell you: A recent APAR for z/OS 3.2 Data Gatherer OA68545 exploits information from z17 processors to provideContinue reading “Memories Are Made Of This”

Remember Memory

In Engineering – Part 8 – Remote Access Detection I talked about reasons why LPARs might go cross-drawer. One reason I didn’t give was about memory. (I should perhaps remind you that on modern machines a logical processor accessing Level 4 Cache or memory in another processor drawer incurs a significant performance penalty, showing upContinue reading “Remember Memory”