[Info-vax] VMS x86 performance ?

[Arne Vajhøj]

On 10/30/2020 1:38 AM, IanD wrote:
> It's been a while since this topic was first aired and the response at the time was "it is too early to tell"
> 
> This was quite some time ago now
> 
> I don't expect benchmarks as such but I would have thought we have a general idea as to how it performs compared to Itanium or Alpha by now?
> 
> Ballpark figures?
> 
> 10%, 20%, 50%, Rabbit on crack? Still too early to tell?
> 
> *Yes, I'm talking about a VM environment since that will probably be the normal deployment environment

When talking performance for VMS x86-64 I think we need to define what 
we are talking about.

absolute performance on VMS x86-64 vs Linux x86-64 same HW or VM

absolute performance on VMS x86-64 some VM expected to be typical vs VMS 
Alpha some typical 15-20 year old box

absolute performance on VMS x86-64 some VM expected to be typical vs VMS 
Itanium some typical 5-10 year old box

relative performance per cost on VMS x86-64 standard HW vs VMS Itanium 
on latest HP box

The first is relevant for those interested in level of optimization in 
the compilers.

The second and third are relevant for those interested in how their
existing system will run when/if upgraded.

The fourth is relevant in the sales pitch to the bean counters.

You seem interested in the second and third.

I have no idea how 9.0 performs. But given the advances in HW, then
it seems given that VMS 9.2 x86-64 will be much faster than
older VMS Alpha and VMS Itanium. If the underlying HW is 3-5-10 times
faster then it does not matter if the compilers are 25% slower
than the best.

Arne