[Simh] simh on OpenVMS

[Henry Bent]

Does the compiler you are using have an option for profile guided
optimization?  This can potentially realize very significant performance
gains on SIMH.

-Henry

On 15 September 2016 at 16:18, gérard Calliet <gerard.calliet at pia-sofer.fr>
wrote:

>
>
> 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>
> <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> 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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