Subject: Re: mem stats
To: Nathan Gelbard <email@example.com>
From: Jason Thorpe <firstname.lastname@example.org>
Date: 03/10/1997 00:43:16
On Mon, 10 Mar 1997 00:30:56 -0800
Nathan Gelbard <gelbard@ENGR.ORST.EDU> wrote:
> Under Linux, I can type 'free' and see all the stats on what
> memory is available, swap, etc. What is the command under
You'll want to read the manual pages for "vmstat" and "pstat".
"vmstat -m" will print kernel memory statistics. If you see:
lestat (thorpej) ~ 113% vmstat -m
Kmem statistics are not being gathered by the kernel.
...then you need to rebuild your kernel with:
options KMEMSTATS # gather kernel memory statistics
Note, with KMEMSTATS _not_ enabled, performance is notably better in
certain critical paths, due to shortcuts the kernel MALLOC() implementation
> How can I tell if swap is actually being used? Under Linux,
> swap gets 'turned on' durring the boot process. I've got a
> swap parition (b), dont know if its acutally being used.
"pstat -s" shows swap usage. The primary swap partition (root device,
partition b) is automatically enabled by the kernel.
basalt (thorpej) ~ 145% pstat -s
Device 1024-blocks Used Avail Capacity Type
/dev/sd0b 99744 50708 49036 51% Interleaved
basalt (thorpej) ~ 146%
As you can see, while I'm running X, a few instances of emacs, and
compiling the NetBSD source tree, I use a bit of swap on my 32M hp380 :-)
Jason R. Thorpe email@example.com
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