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Local, Near, Far part 12 - I have a 10 core POWER7 chip, eh!
Time to correct a few assumptions and statements that I made a while back. Previously I said the POWER Hypervisor decides where to put a Virtual Machine (VM/LPAR) based on the Virtual Processor number (spreading factor). Well, apart from it nearly being right ... I was actually wrong! I got talking to one of these very impressive Hypervisor developers in Germany and he put me right. In most of my larger machines, I do what I think is fairly normal for creating an VM - like working with a CPU core to RAM ratio that my customers use, like 1... [More]
Tags: power7 affinity cores chips lssrad core cpu aix srad |
Local, Near & Far Memory - Help needed with data from a Power 730,740 & 750
I need you to help me settle an argument or rather lack of information. I am getting conflicting messages about whether these smaller Power7 machines use Local and Near or Local and Far memory. I documented what I thought was correct in the Part 1 of this series of blog's. Actually, there is not much difference as these machines have two tiers of memory like "on the chip" or "some where else" so the names are hardly vital but I would like my facts straight. Unfortunately, I don't have examples of these machines with more... [More]
Tags: 730 affinity lssrad 740 srad 710 750 lpar aix power powervm 720 power7 vm |
Local, Near & Far Memory part 2 - Virtual Machine CPU & Memory Lay Out
So you know about Power7 Local, Near and Far memory for your actual machine but what is your Virtual Machine (LPAR) actually using? There are three key commands to show you (lssrad, mpstat and topas) and we will look at some example output. First, we need to define an SRAD or a Scheduler Resource Affinity Domain . If you have used Resource Sets with AIX WLM or WPAR then you have a good idea what these are like. An SRAD is a group of resources but in our case CPU/cores and the associated memory that is directly attached to it. As an... [More]
Tags: lssrad topas affinity srad mpstat powervm aix6 power7 resource aix7 domain scheduler |
