From: ldo@nz.invalid   
      
   On Sun, 21 Sep 2025 10:56 +0100 (BST), John Dallman wrote:   
      
   > In article <10ane0m$1dl6v$4@dont-email.me>, ldo@nz.invalid (Lawrence   
   > D_Oliveiro) wrote:   
   >   
   >> Mainframes were never designed for high CPU performance.   
   >   
   > IBM certainly intended them to be, and the IBM 360 Model 91 was the   
   > first ever computer to use Tomasulo's algorithm, which is now ubiquitous   
   > in fast microprocessors.   
      
   Or rather, IBM claimed they would offer high CPU performance. Remember,   
   this machine was vapourware for the longest time; the 360/90 project was   
   something IBM created, to begin with, just to try to dissuade potential   
   customers from buying CDC’s 6000-family machines. By the time it finally   
   shipped as the 360/91, it fell far short of those built-up expectations.   
      
   IBM overpromised and underdelivered, just as they did earlier with the   
   7030.   
      
   > Modern IBM Z is not CPU-competitive with fast systems, but it is much   
   > faster than the originals ...   
      
   I’m sure it is, but it still wouldn’t be anywhere near the â   
   œsupercomputerâ€�   
   class.   
      
   Mainframes are all about high I/O throughput. They are not about high CPU   
   performance, and they are not about low I/O latency (needed for   
   interactive or real-time operation) either.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)