[Simh] performance issues vax / simh / openvms / itanium

[Mark Pizzolato]

Hi gérard,

Please try to run with the NOASYNCH binary which I can build with:

                $ mmk /macro=(noasynch=1) vax

And let me know directly if you see different performance.

Thanks,


-          Mark

From: Simh [mailto:simh-bounces at trailing-edge.com] On Behalf Of gérard Calliet
Sent: Monday, April 24, 2017 8:56 AM
To: Wilm Boerhout <wilm at boerhout.nl>; simh at trailing-edge.com
Subject: Re: [Simh] performance issues vax / simh / openvms / itanium


No alignment faults seen.

Thanks,

Gérard Calliet

Le 24/04/2017 à 16:33, Wilm Boerhout a écrit :
Does The compiler generate simh code that causes alignment faults when simh executies? A notorious source of bad performance on early Itanium ports.

/Wilm
Op ma 24 apr. 2017 om 14:22 schreef gérard Calliet <gerard.calliet at pia-sofer.fr<mailto:gerard.calliet at pia-sofer.fr>>
Hello,

I have a VAX emulated with simh compiled and running on OpenVMS 8.4-1H1
(vsi) Itanium i4. The software used does only heavy cpu tasks (Ada cross
compiler).
The performance is surprinsigly bad: about 4 times lower than then VAX
station 4000-90. A compilation batch which was taking 7mn of CPU takes
on the emulator 24mn of CPU.
The host Itanium uses 1 core at 100%, and not a lot of page faults, 100
dio /s which I think is for the emulated clock.

(I use the same (back/image) system disk as of the initial hardware VAX.
I have verified I use all the 512m of memory, there are not a lot of
page fault on the VAX.)


I don't understand why it is so bad. I thought about some special things
on C compilation, but which?
Any suggestions?

Thanks,
Gérard Calliet


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