Using meminfo information 2007-07-23 - By Rick Stevens
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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).
-- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- --
- 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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