[Simh] simh on OpenVMS

[gérard Calliet]

Le 15/09/2016 à 20:04, Mark Pizzolato a écrit :
>
> Patrick's suggestion is a great one.  Please explore that.
>
I think so. It'll take some time, because I'm going now to USA for VMS 
bootcamp. I'll have talks there with VMS enthousiasts, and all I ear in 
this list will be tried.
Go on suggest. And if you think about tools to get figures, I'll take.
>
> Additionally, you're not necessarily  making a fair comparison.  To be 
> fair, you should compare the I2 system to an X86 system that was 
> shipping when that I2 system first shipped.  I suspect you'll see 
> closer results.
>
I understand, but what is strange is when I have been able to use i4 
(network did work at that time) the performance results where as bad as 
with i2. So I was thinking there is some structural issue with Itanium 
or with OpenVMS.
>
> - Mark
>
> On Sep 15, 2016 10:22 AM, Patrick Finnegan <pat at computer-refuge.org> 
> wrote:
>
>     >
>
> > For #2, could you try comparing performance on VMS vs on Linux 
> running as the host OS on the same Itanium system?  Narrowing it down 
> to one variable at a time makes it easier to test differences.
> >
> > You should be able to use a live CD on the Itanium system to test 
> without reinstalling the system.
> >
> > Pat
> >
> > On Thu, Sep 15, 2016 at 11:50 AM, gérard Calliet 
> <gerard.calliet at pia-sofer.fr <mailto:gerard.calliet at pia-sofer.fr>> wrote:
>
>     >>
>
> >> Hello,
> >>
> >> simh on OpenVMS again.
> >>
> >> 1) with the help of an Lan expert of VSI, I could use pcap on VMS 
> on an Itanium i4... some time and it is again impossible. I will meet 
> the VSI expert on OpenVMS bootcamp in Boston next week, anf I hope we 
> will address this issue again. Any idea welcomed, of course. (It seems 
> PCAP on VMS does'nt like larger frame with i4, because it is the only 
> diference I can see between i2 and i4 Itanium servers, and it works on 
> i2).
> >>
> >> 2) there is a very bad performance issue: same batch on a windows10 
> / i7 platform six times faster than on an i2 / OpenVMS platform. I 
> don't think it's a normal issue of windows or x86 being better than 
> OpenVMS / italium i2. Something goes wrong somewhere. I gave a huge 
> working set to the host process, and it is not doing paging, I tried 
> Decram to avoid physical I/O, asynchronous I/O is enabled for simh 
> (and the simh configuration is  the same on windows and on OpenVMS).
> >>
> >> Any help will be welcomed: ideas, tools for tracking,...
> >>
> >> Best regards,
> >>
> >> Gérard Calliet
> >>
> >>
> >>
> >> ---
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> le logiciel antivirus Avast.
> >> https://www.avast.com/antivirus <https://www.avast.com/antivirus>
> >>
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> >
> >
>



---
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