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
<[email protected] <mailto:[email protected]>>
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
---
L'absence de virus dans ce courrier électronique a été vérifiée
par le logiciel antivirus Avast.
https://www.avast.com/antivirus
_______________________________________________
Simh mailing list
[email protected] <mailto:[email protected]>
http://mailman.trailing-edge.com/mailman/listinfo/simh
---
L'absence de virus dans ce courrier électronique a été vérifiée par le logiciel
antivirus Avast.
https://www.avast.com/antivirus
_______________________________________________
Simh mailing list
[email protected]
http://mailman.trailing-edge.com/mailman/listinfo/simh
