🚀 go-pugleaf

In article <pidigf$p59$1...@Iltempo.Update.UU.SE>,
Johnny Billquist  <b...@softjar.se> wrote:
>On 2018-07-14 16:45, John Levine wrote:
>> In article <picc8e$360$2...@dont-email.me> you write:
>>> One tended to be overawed by the PDP10 series, but I wonder if
>>> its operating systems would seem rather infra dig compared to Linux
>>> today?
>> 
>> In terms of number of features, linux wins by a parsec.
>
>Not so sure. If we talk about the OS as such, there are a couple of 
>things Linux has that TOPS-20 don't. But that is true in the other 
>direction as well.
>
>Now, if you instead were to talk about useful applications, then sure, 
>Linux have way more of that.
>
>> In terms of getting useful work out of a computer that ran at about
>> 5MHz (yes, I know the KA was async) and had 1MB of core, TOPS-10 wins
>> just as much.  It had features that mattered then but don't any more
>> like doing disk I/O directly in and out of buffers in user space
>> without an extra copy.  I could have done without the sequence numbers
>> with the flag in the low bit of the word, though.
>
>Disk directly to buffers in user space in Linux? Sure, it's called mmap. 
>Which, by the way, is more or less a direct ripoff from TOPS-20.
>
>> Of course, even TOPS-10 was a pig compared to DTSS which ran on a GE
>> 635, about the same speed as a KA-10, with a very slow front end
>> terminal mux (sort of like a 680) and provided good performance to 100
>> users.
>
>One of the more interesting features I remember from Tops-10 was that 
>you could have a daemon that kicked in when files were accessed that you 
>did not have access rights to. And that went though a script, which 
>could modify the rules for access to the file arbitrarily. I remember it 
>being very cool, and I don't know of anything similar today.

[smw] You are talking about FILDAE (file daemon.)  See the TOPS-10
Operating System Commands manual for more information.

Sam