Date: Fri, 15 Jun 2018 08:43:34 -0700 From: bob prohaska <fbsd@www.zefox.net> To: Mark Millard <marklmi@yahoo.com> Cc: Warner Losh <imp@bsdimp.com>, freebsd-arm@freebsd.org, "Rodney W. Grimes" <freebsd-rwg@pdx.rh.cn85.dnsmgr.net>, bob prohaska <fbsd@www.zefox.net> Subject: Re: GPT vs MBR for swap devices Message-ID: <20180615154334.GA39777@www.zefox.net> In-Reply-To: <834EA7A6-B567-436F-96B2-0C75FACA3FF9@yahoo.com> References: <20180614175622.GC35161@www.zefox.net> <201806142110.w5ELAL0N046840@pdx.rh.CN85.dnsmgr.net> <20180615035225.GA37370@www.zefox.net> <CANCZdfoNasSpvEN-y3bzsDfWT=_atfp62AKvdpwK8bUQKi=bgA@mail.gmail.com> <20180615051527.GB37370@www.zefox.net> <834EA7A6-B567-436F-96B2-0C75FACA3FF9@yahoo.com>
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On Thu, Jun 14, 2018 at 11:37:48PM -0700, Mark Millard wrote:
>
> When I look at:
>
> # vmstat -c -w 5
> procs memory page disks faults cpu
> r b w avm fre flt re pi po fr sr da0 ad0 in sy cs us sy id
> 1 0 0 416M 224M 1647 1 0 0 1856 142 0 0 144 1791 1024 4 2 94
> 0 0 0 416M 224M 9 0 0 0 0 1 0 0 4 85 116 0 0 100
> 0 0 0 416M 224M 12 0 0 0 0 1 0 0 2 93 113 0 0 100
> 0 0 0 416M 224M 9 0 0 0 2 1 1 0 4 64 121 0 0 100
> . . .
>
> and "man vmstat" I do not see any column that is the swap space
> usage (nor any combination of columns to do such a calculation
> from).
>
> I do not expect that vmstat reports what you are likely/primarily
> looking for.
>
> An example is "avm" which for which the man page reports:
>
> . . . Note that the entire
> memory object's size is considered mapped even if only a subset
> of the object's pages are currently mapped. This statistic is
> not related to the active page queue which is used to track real
> memory.
>
> The free list size ("fre") is not sufficient either.
>
That seems astonishing. I imagined that among those columns _had_ to be
reads from and writes to the swap partitions.
It looks as if
top -d 1000 | grep Swap
produces a running list of swap usage, but one must guess how many
times to iterate:
bob@www:/usr/src % top -d 1000 | grep Swap
Swap: 3072M Total, 30M Used, 3041M Free
Swap: 3072M Total, 30M Used, 3041M Free
Swap: 3072M Total, 30M Used, 3041M Free
Swap: 3072M Total, 30M Used, 3041M Free
Swap: 3072M Total, 30M Used, 3041M Free
.......
Replacing the "1000" with "0" or "infinite" triggers
a syntax error. Is there a special parameter that makes top run till
it's killed, as in interactive mode? I didn't recognize any hint in the
man page.
Thanks for reading!
bob prohaska
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