If I were to add my two cents, the problem is the large memory defined
for the simh VAX system. I suspect this is larger than the working set
in the host VMS system, meaning you will have lots of paging going on,
which cause the whole thing to be I/O bound, even though the OP thinks
it's a CPU bound problem.
Either reduce the memory of the simh VAX instance, or increase the
working set of the host system, so that you don't page so much.
Johnny
On 2016-08-17 21:49, khandy21yo wrote:
I notice that you don't have a 'SET CPU IDLE=VMS' line.
It really helps the host systems CPU usage.
-------- Original message --------
From: gérard Calliet <[email protected]>
Date: 8/17/16 8:54 AM (GMT-07:00)
To: [email protected]
Subject: [Simh] newbie question about simh performance
Hello,
I use simh to emulate VMS software, just a compiler impossible to port
out of VAX/VMS. The compiler uses a lot of CPU resource, and very few of
the others resources, like IO.
I see that my jobs consume, for example, 2mn of cpu, for 2 hours of
elapsed time, which seems bizarre because there is not a lot of IO and
the compile task is the only one on the emulated VAX.
I run simh on itanium i4 OpenVMS, and I hoped I would have good
performances on this fast computer.
I see that the simh process running on OpenVMS itanium does a lot of
(direct) IO.
Perhaps I forgot some good parameters? My .ini is minimal :
load -r ka655x.bin
attach NVR ka655.nvr
set cpu 512m
set -L rq0 rauser=18000000
attach rq0 datauser2.dsk
set xq mac=08-00-2B-3C-96-78
attach xq eth1
b cpu
Any help will be welcomed, advice, documentation...
Thanks,
Gérard Calliet
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