26 Jan
2021
26 Jan
'21
10:46 p.m.
On 1/26/2021 10:05 AM, Henry Bent wrote:
On Mon, 25 Jan 2021 at 11:02, Arnold Robbins
<arnold(a)skeeve.com
<mailto:arnold@skeeve.com>> wrote:
Hi.
Does anyone know how to add swap space on a System V Release 2 system?
In particular, on an emulated AT&T 3B1. The kernel is S5R1 or S5R2
vintage.
I don't see any commands with 'swap' in their names.
A little bit of Google Groups trawling turned up this:
https://groups.google.com/g/comp.sys.att/c/8XLILI3K8-Y/m/VxVMJNdt9NQJ
<https://groups.google.com/g/comp.sys.att/c/8XLILI3K8-Y/m/VxVMJNdt9NQJ>
But I don't have one of those systems, so I have no way to verify.
-Henry
I don't know about 3B versions, but on Dell SVR4 on 86Box
(https://notes.technologists.com/notes/2021/01/19/koko-dell-unix-sustainable/)
I see
/ # apropos swap
swap(1m): swap - swap administrative interface
swapctl(2): swapctl - manage swap space
...
I've never tried to adjust swap, just trust that our install did the
right thing. On this system, freshly booted, with 32M memory and 5G
"disk", I see
/ # swap -l
path dev swaplo blocks free
/dev/swap 0,2 0 98784 90960
Here's the beginning of man swap:
NAME
swap - swap administrative interface
SYNOPSIS
/usr/sbin/swap -a swapname swaplow swaplen
/usr/sbin/swap -d swapname swaplow
/usr/sbin/swap -l [ -s ]
/usr/sbin/swap -s
DESCRIPTION
swap provides a method of adding, deleting, and monitoring the system
swap areas used by the memory manager. The following options are
recognized:
-a Add the specified swap area. swapname is the name of the block
special partition, e.g., /dev/dsk/0s2 or a regular file. swaplow
is the offset in 512-byte blocks into the partition where the
swap area should begin. swaplen is the length of the swap area
in 512-byte blocks. This option can only be used by the super-
user. If additional swap areas are added, it is normally done
during the system start up routine /etc/rc2.d when going into
multi-user mode.
...
Charlie
--
voice: +1.512.784.7526 e-mail: sauer(a)technologists.com
fax: +1.512.346.5240 Web: https://technologists.com/sauer/
Facebook/Google/Skype/Twitter: CharlesHSauer