VAX hardware 89 VUPS
SIMH 27 VUPS
Gérard Calliet
Le 06/03/2019 à 19:46, Hittner, David T [US] (MS) a écrit :
So from a performance analysis perspective, what are the VUPS ratings of the
VS4000-90 and the SIMH VAX running on the RX2800?
That's (more or less) the Integer performance rating.
David
-----Original Message-----
From: Simh [mailto:simh-boun...@trailing-edge.com] On Behalf Of gérard Calliet
Sent: Wednesday, March 6, 2019 1:11 PM
To: Pontus Pihlgren <pon...@update.uu.se>
Cc: simh@trailing-edge.com
Subject: EXT :Re: [Simh] some performance issues
Hi,
We had a VAX Station 4000-90 128M Memory.
We have a RX28000 9520 8G Memory.
Gérard Calliet
Le 06/03/2019 à 10:57, Pontus Pihlgren a écrit :
Hi
I'm having trouble understanding your question. Are you comparing
CPU-time of a real VAX(which model?) to emulated CPU-time on an
Itanium machine(which one?).
Emulation will have an associated overhead. If you are compareing a
fast VAX to an emulation on a slow Itanium... well, Itanium is hard to
optimize for.
/P
On Tue, Mar 05, 2019 at 03:13:53PM +0100, gérard Calliet wrote:
Hello,
Again I have some performance issues with simh.
I built it on OpenVMS Itanium. It runs on a process with enought
memory, it takes 1 of the 8 CPU Itanium with 100%, no page faults,
and 100 BIO by second.
On the emulated VAX we are running processes CPU intensive (old Ada
compiler), they take 100% of the CPU, also very few page fault, very
few IO.
And the CPU time is about 2 or 3 times the CPU time on the hardware,
and so elapsed time 3 or 4 times. (For my understanding, it is
difficult to think the same stream of instructions can use different
CPU times between hardware and SIMH).
Where can I do something to improve performance? Are there parameters
(or constant in compilation) in SIMH which could help?
And the specific context is processes doing almost only CPU
computing.
my configuration, and what commit I use
on error continue
load -r ka655x.bin
attach NVR ka655.nvr
set cpu 512m
set cpu conhalt
set RL disable
set LPT disable
set TQ disable
set -L rq0 rauser=18000000
attach rq0 datauser2.dsk
set xq mac=08-00-2B-3C-96-75
attach xq eth0
dep bdr 0
b cpu
$ run vax-i64
MicroVAX 3900 simulator V4.0-0 Beta git commit id: 8810571d
sim>
Thanks,
Gérard Calliet
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