Using meminfo information 2007-07-24 - By Karl Pearson
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On Mon, July 23, 2007 3:15 pm, Rick Stevens wrote:
> On Mon, 2007-07-23 at 13:51 -0700, Waldher, Travis R wrote:
>> > -- --Original Message-- --
>> > From: Rick Stevens [mailto:rstevens@(protected)]
>> > Sent: Monday, July 23, 2007 1:10 PM
>> > To: Getting started with Red Hat Linux
>> > Subject: Re: Using meminfo information
>> >
>> > On Mon, 2007-07-23 at 12:54 -0700, Waldher, Travis R wrote:
>> > > I am trying to determine how much memory really is in use on the
>> > > system for executing commands. Would going by "Active" be the most
>> > > accurate?
>> > >
>> > > There is 4.8GB of RAM available for processes beyond the
>> > OS, of that
>> > > 3.2GB are in use with 1.9GB free?
>> > >
>> > > MemTotal: 6009532 kB
>> > > MemFree: 298016 kB
>> > > Buffers: 190068 kB
>> > > Cached: 4842408 kB
>> > > SwapCached: 0 kB
>> > > Active: 3256152 kB
>> > > Inactive: 1919492 kB
>> > > HighTotal: 0 kB
>> > > HighFree: 0 kB
>> > > LowTotal: 6009532 kB
>> > > LowFree: 298016 kB
>> > > SwapTotal: 8388600 kB
>> > > SwapFree: 8388596 kB
>> > > Dirty: 48 kB
>> > > Writeback: 0 kB
>> > > Mapped: 126552 kB
>> > > Slab: 510696 kB
>> > > CommitLimit: 11393364 kB
>> > > Committed_AS: 198068 kB
>> > > PageTables: 3052 kB
>> > > VmallocTotal: 2147483647 kB
>> > > VmallocUsed: 6144 kB
>> > > VmallocChunk: 2147477355 kB
>> >
>> > Yes, active is really the number that's involved in programs
>> > (code, BSS and heap).
>> >
>> > -- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- --
>> > - Rick Stevens, Principal Engineer rstevens@(protected) -
>> > - VitalStream, Inc. http://www.vitalstream.com -
>> > - -
>> > - Heisenberg _may_ have slept here -
>> > -- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- --
>>
>> Is it correct to say that the sar command cannot report how much active
>> and inactive cache there is? If it can, I'm not finding it - I can only
>> find how much is being used for the cache. Or in sar land, is that the
>> same thing as active in the meminfo file?
>
> The "kbcached" column of "sar -r" reports the amount of cache used.
> As far as I know, it can't split active and inactive out.
>
> The active section of /proc/meminfo is what's used for code, BSS and
> heap of programs on the run queue (in other words, memory dedicated
> to runnable programs).
I give. If meminfo can tell us active memory, why can't sar. It would be
pretty easy to write a script to give yourself the information you need. If
that information is needed by another program/CGI, then use printf $VAR in
it...
Okay, more than was asked.
Karl
>
> -- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- --
> - Rick Stevens, Principal Engineer rstevens@(protected) -
> - VitalStream, Inc. http://www.vitalstream.com -
> - -
> - Always remember you're unique, just like everyone else. -
> -- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- --
>
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--
Karl L. Pearson
karlp@(protected)
http://consulting.ourldsfamily.com
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