Mailinglist Archive: opensuse (794 mails)

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Re: [opensuse] Two by for swap?
On 29/11/17 03:16 PM, David T-G wrote:
I think (but am not
sure) even classic ATT v7.

Old v7 was just a swapping system, it ran n the very basic PDP-11 (and others of
that era) that did not have paging and instruction restart.

Processes forked by being swapped out, then the in-core version then being given
a new id etc. It wasn't so much 'copy-on-write' as 'copy by writing out to

So V7 HAD to have swap space.
And you can see the influence of the 2x memory; it is just possible that there
was a single process that used max memory, so there needed to be enough swap
disk for the swapped out initial, plus the allocation for swapping out the
forked copy so you could swap back in the 'original'.
A bit theoretical ... but there you have justification.

A: Yes.
> Q: Are you sure?
>> A: Because it reverses the logical flow of conversation.
>>> Q: Why is top posting frowned upon?

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