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From: Mary Ann Horton <mah@mhorton.net>
To: tuhs@tuhs.org
Subject: [TUHS] Re: Word erase?
Date: Fri, 12 Apr 2024 08:58:05 -0700	[thread overview]
Message-ID: <1ac39bdc-df66-43f7-a5d3-1bd3d160c43b@mhorton.net> (raw)
In-Reply-To: <202404090151.4391pJMR034798@elf.torek.net>

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On 4/8/24 18:51, Chris Torek wrote:
>> Chris Torek of UofMaryland.
> I got it into 4.3-Reno.  I did not come up with the whole thing but
> Rehmi Post and I worked out how to compute %cpu without using floating
> point (the original VAX-only version used FP but we had to stop doing
> that when we were worried about porting to systems that lacked kernel
> access to FP).
>
> The version in current FreeBSD is fancier now though.
>
> Chris

Around 1981 I put a similar calculation into 2BSD for the PDP-11 with no 
floating point, but this was for the system load average, not the %cpu. 
It just imputes a decimal point in the middle of what the processor 
considers an integer.

Thanks,

/Mary Ann Horton/ (she/her/ma'am)
       Award Winning Author
maryannhorton.com <https://maryannhorton.com>




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  reply	other threads:[~2024-04-12 15:58 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-04-08 15:02 [TUHS] " Dan Cross
2024-04-08 15:15 ` [TUHS] " Marc Donner
2024-04-08 15:18 ` arnold
2024-04-08 15:29   ` Warner Losh
2024-04-08 15:59     ` Lars Brinkhoff
2024-04-08 15:39   ` Larry McVoy
2024-04-08 16:06   ` Rich Salz
2024-04-09  1:51     ` Chris Torek
2024-04-12 15:58       ` Mary Ann Horton [this message]
2024-04-08 17:09   ` Steve Nickolas
2024-04-08 22:51   ` Mary Ann Horton
2024-04-12  1:29     ` Joseph Holsten
2024-04-08 16:14 ` Clem Cole

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