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

[Supratim Sanyal]

> On Nov 18, 2021, at 3:44 PM, R. Voorhorst <R.Voorhorst at swabhawat.com> wrote:
> 
> Nope: 2000/1 means 2000 instructions and wat 1 msec which is the resultion of the sleep timer.

Yes, thanks, my bad. I think the copy/rename target=source thing of TOPS-10 is causing permanent damage to my mind.

>  
>  
> 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 <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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