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#1 (**permalink**) 01-12-2008, 06:36 AM

In Solaris 8, when using top,
is "swap in use" and "swap free" referring to:
1) overall VM memory ( RAM + total DISK swap ( swap -l ) )
2) The swap DISK ( Total of swap -l )
3) RAM only
4) RAM + swap in use?
5) Some other combination?

I would assume it is #1 but the numbers don't seem to add up on my
system.

I have 24GB RAM and 8 GB SWAP DISK,
should "swap in use" + "swap free" = 32GB?

Or from swap -s : used + available = 32 GB?

My system for swap -s is showing 17,803,208k used, 8,014,200k
available
( it appears these are the same numbers as top is reporting for "swap
in use" and "swap free" )

df -k /tmp = 1,048,576 kb

swap -l shows 8 GB.

What am I missing?

#2 (**permalink**) 01-12-2008, 06:36 AM

In comp.unix.solaris Richard <google@richmore.com> wrote:
> In Solaris 8, when using top,
> is "swap in use" and "swap free" referring to:
> 1) overall VM memory ( RAM + total DISK swap ( swap -l ) )

Yes. Same as swap -s.

> I have 24GB RAM and 8 GB SWAP DISK,
> should "swap in use" + "swap free" = 32GB?

Close to it. The kernel allocates space for itself as a percentage of
RAM. So on a 24G RAM machine, you lose quite a bit to the kernel. That
amount is not in VM. So it's the right order, but it won't be exact.

> Or from swap -s : used + available = 32 GB?

Right (with the same limitation).

> My system for swap -s is showing 17,803,208k used, 8,014,200k
> available
> ( it appears these are the same numbers as top is reporting for "swap
> in use" and "swap free" )

> df -k /tmp = 1,048,576 kb
> swap -l shows 8 GB.
> What am I missing?

Ignore 'df' output. There's no way to reliably interpret that output
for swap. That's for a filesystem.

Post 'swap -l' and 'swap -s' output.

Does 'top' agree with 'swap -s'?

--
Darren Dunham ddunham@taos.com
Senior Technical Consultant TAOS http://www.taos.com/
Got some Dr Pepper? San Francisco, CA bay area
< This line left intentionally blank to confuse you. >

#3 (**permalink**) 01-12-2008, 06:37 AM

Darren Dunham <ddunham@redwood.taos.com> wrote in message news:<ZX7mc.45253$D66.664@newssvr29.news.prodigy.c om>...
> In comp.unix.solaris Richard <google@richmore.com> wrote:
> > In Solaris 8, when using top,
> > is "swap in use" and "swap free" referring to:
> > 1) overall VM memory ( RAM + total DISK swap ( swap -l ) )
>
> Yes. Same as swap -s.
>
> > I have 24GB RAM and 8 GB SWAP DISK,
> > should "swap in use" + "swap free" = 32GB?
>
> Close to it. The kernel allocates space for itself as a percentage of
> RAM. So on a 24G RAM machine, you lose quite a bit to the kernel. That
> amount is not in VM. So it's the right order, but it won't be exact.
>
> > Or from swap -s : used + available = 32 GB?
>
> Right (with the same limitation).
>
> > My system for swap -s is showing 17,803,208k used, 8,014,200k
> > available
> > ( it appears these are the same numbers as top is reporting for "swap
> > in use" and "swap free" )
>
> > df -k /tmp = 1,048,576 kb
> > swap -l shows 8 GB.
> > What am I missing?
>
> Ignore 'df' output. There's no way to reliably interpret that output
> for swap. That's for a filesystem.
>
> Post 'swap -l' and 'swap -s' output.
>
> Does 'top' agree with 'swap -s'?

$ /usr/platform/sun4u/sbin/prtdiag | grep -i memory ; swap -l; swap
-s;
Memory size: 24576 Megabytes
========================= Memory Configuration
===============================
swapfile dev swaplo blocks free
/dev/vx/dsk/swapvol 242,6 16 8392048 8140816
/host/vol1/swap.file - 16 4194288 3963488
/host/vol1/swap.file2 - 16 4194288 3959552
total: 14560856k bytes allocated + 2701816k reserved = 17262672k used,
8905216k available

top: Memory: 24G real, 3924M free, 16G swap in use, 8757M swap free

#4 (**permalink**) 01-12-2008, 06:37 AM

In comp.unix.solaris Richard <google@richmore.com> wrote:

>> Post 'swap -l' and 'swap -s' output.
>>
>> Does 'top' agree with 'swap -s'?

> $ /usr/platform/sun4u/sbin/prtdiag | grep -i memory ; swap -l; swap
> -s;
> Memory size: 24576 Megabytes
> ========================= Memory Configuration
> ===============================
> swapfile dev swaplo blocks free
> /dev/vx/dsk/swapvol 242,6 16 8392048 8140816
> /host/vol1/swap.file - 16 4194288 3963488
> /host/vol1/swap.file2 - 16 4194288 3959552
> total: 14560856k bytes allocated + 2701816k reserved = 17262672k used,
> 8905216k available

> top: Memory: 24G real, 3924M free, 16G swap in use, 8757M swap free

Yup, it all agrees, even if I don't understand the results.

You should have 32GB minus some kernel overhead in VM space. Seems
strange that the overhead appears to be 32 - 16 - 8 => 8GB!!

If I had a chance, I would 'swap -d <file>' each of the disk swap files
until I was down to RAM only and see what swap -s said, but you're close
to not having enough space to do that.

--
Darren Dunham ddunham@taos.com
Senior Technical Consultant TAOS http://www.taos.com/
Got some Dr Pepper? San Francisco, CA bay area
< This line left intentionally blank to confuse you. >

#5 (**permalink**) 01-12-2008, 06:38 AM

Was Re: top/vmstat swap in use/swap free

Darren Dunham <ddunham@redwood.taos.com> wrote in message news:<TINmc.6104$Zn6.2571@newssvr27.news.prodigy.c om>...
> In comp.unix.solaris Richard <google@richmore.com> wrote:
>
> >> Post 'swap -l' and 'swap -s' output.
> >>
> >> Does 'top' agree with 'swap -s'?
>
>
>
> > $ /usr/platform/sun4u/sbin/prtdiag | grep -i memory ; swap -l; swap
> > -s;
> > Memory size: 24576 Megabytes
> > ========================= Memory Configuration
> > ===============================
> > swapfile dev swaplo blocks free
> > /dev/vx/dsk/swapvol 242,6 16 8392048 8140816
> > /host/vol1/swap.file - 16 4194288 3963488
> > /host/vol1/swap.file2 - 16 4194288 3959552
> > total: 14560856k bytes allocated + 2701816k reserved = 17262672k used,
> > 8905216k available
>
> > top: Memory: 24G real, 3924M free, 16G swap in use, 8757M swap free
>
> Yup, it all agrees, even if I don't understand the results.
>
> You should have 32GB minus some kernel overhead in VM space. Seems
> strange that the overhead appears to be 32 - 16 - 8 => 8GB!!
>
> If I had a chance, I would 'swap -d <file>' each of the disk swap files
> until I was down to RAM only and see what swap -s said, but you're close
> to not having enough space to do that.

I don't understand the results either. How could overhead be 8GB?!? (
25% ). This sounds more like a Windows box than a Solaris box!

Rich

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