[Simh] Reference performance benchmarks

[Johnny Billquist]

I would start at CPU idle detection.

	Johnny

On 2016-12-12 22:29, khandy21yo wrote:
> Is your speed problem limited to disk access, or is it also CPU related?
> Running in a browser might mean that the disk access is going through
> the network, which can slow it down excessively, There are several
> bottlenecks on a system, like slow disks, that don't effect other
> aspects, like instruction speed, it's important to determine exactly
> where the speed limits exists.
> CPU instruction speed, excessive swapping, disk bandwidth, terminal baud
> water, . .. They can all be a problem, and it can be more than one at a
> time.
>
>
>
> Sent from my Galaxy Tab® A
>
> -------- Original message --------
> From: Jacob Goense <dugo at xs4all.nl>
> Date: 12/12/16 12:13 PM (GMT-07:00)
> To: simh at trailing-edge.com
> Subject: [Simh] Reference performance benchmarks
>
> I'm running simh in rather tight corners. Mostly VAX/780 and PDP-11/70
> with V6 or BSD. Simh runs in a browser, or, I have (too) many of them
> on underpowered Asus Eee PC's. Any tips on how I can check if I have
> taken things too far? Like minimum values to look for in SHOW CLOCK,
> or any tools I can run that can be referenced against same on real kit.
>
> I run into the same question on the I/O end. During the installation
> of v6 I can do dd if=/dev/mt0 of=/dev/rk1 bs=2048 count=1000 skip=1025
> and it is done in a second on machine that is doing nothing else. With
> simh running in a browser on a small busy machine it can take up to an
> hour. I have no idea how to gauge how far this is off from real kit.
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-- 
Johnny Billquist                  || "I'm on a bus
                                   ||  on a psychedelic trip
email: bqt at softjar.se             ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol