[HECnet] ANF10 network --> DN200/DN20 --> instant gratification ...? -->throttling

[R. Voorhorst]

Nope: 2000/1 means 2000 instructions and wat 1 msec which is the resultion of the sleep timer.

 

 

Reindert

 

From: owner-hecnet at Update.UU.SE [mailto:owner-hecnet at Update.UU.SE] On Behalf Of Supratim Sanyal
Sent: Thursday, 18 November, 2021 21:06
To: hecnet at Update.UU.SE
Subject: Re: [HECnet] ANF10 network --> DN200/DN20 --> instant gratification ...?

 

On 11/18/21 1:35 PM, Paul Koning wrote:

 
 

On Nov 18, 2021, at 1:26 PM, Supratim Sanyal  <mailto:supratim at riseup.net> <supratim at riseup.net> wrote:
 
On 11/18/21 11:10 AM, R. Voorhorst wrote:
 

Hi,

Hi.

 ...
2.       The simh config file for configuring a working simh Pdp11/34 with the proper throttling to make it work; the proper setting is important because of Chk11 init phase which is instruction timing based!!! 

How does one arrive at a realistic argument for throttle? Did you put 2000/1 because you reckon your host processor does 2000 instructions in the same time as the guest processor does 1? Or is it more pure clock speed based?
 
SET THROTTLE 2000/1

 
Check the docs ("help set throttle").  The simplest is to say what instruction rate you want: "set throttle 300k" is probably a pretty realistic setting to make it look like an 11/20; "set throttle 2m" is a somewhat optimistic 11/70.

I am interpreting the "2000/1" as "wait 2 seconds after one instruction" which cannot be right, hence my question.

BTW, throttle is dicey; my MicroVAX 3800 (the SIMH "vax") machines are set to 1.9 mips (3.8 times of the 0.5 mip 11/780), but still they grab 100% of a core running *BSD.

But this is a discussion for the SIMH forum, not here.

 

 
  paul
 
 

-- 


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