[Info-vax] OS implementation languages

gah4 gah4 at u.washington.edu
Thu Aug 31 00:35:02 EDT 2023


On Tuesday, August 29, 2023 at 10:25:31 AM UTC-7, Simon Clubley wrote:
  
 (snip)

> 400GB/s ??? Is that all ??? Amateurs!!! :-) 
 
> On a more serious note, I wonder what the maximum rate VMS is capable 
> of emitting data at if it was using the fastest network hardware 
> available.
 
I am not sure what hardware can do now.

Traditionally, Ethernet was much faster than processors, such that the
shared media could handle the load. 

That is less obvious now, but a 400Gb/s network doesn't mean that one host
can go that fast.

Otherwise, there are many stories of running old OS in emulation on modern
hardware, running into problems that never would have occurred years ago.

One is that emulators often do synchronous I/O.  The I/O interrupt occurs almost
immediately, as seen by the OS.  Some OS assume that there is time in between.

It is, then, possible that surprises will be found when running I/O at higher speed.

It might be useful to say which host architecture you were asking about.
I am sure no-one thought about 400Gb/s Ethernet for VAX.




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