Re: 4.7-beta1: memory usage differences

[Martin Pala]

Hi,

on linux the system memory usage is counted as:

  MemTotal - MemFree - Buffers - Cached

The result shows the memory usage (excluding buffers/cache which is 
allocated by the kernel and reduced automaticaly if memory is needed).

This gives in your case 1257616 kB (based on your /proc/meminfo bellow).

The value reported by monit corresponds to the "-/+ buffers/cache:" line 
of the 'free' utility  - for example on my server with 2GB RAM:

--8<--
address@hidden ~]# free
             total       used       free     shared    buffers     cached
Mem:       2074964    1331000     743964          0     341192     627308
-/+ buffers/cache:     362500    1712464
Swap:      2112536          0    2112536
--8<--


Martin


metaworx - martin rüegg wrote:
> hi
>
> we just installed 4.7-beta1 on our system to check out the new system
> monitoring feature.
>
> we run debian linux with
>
> address@hidden:~$ uname -a
> Linux dolomit 2.6.14.4-vs2.0.1 #1 SMP Fri Dec 16 13:05:24 CET 2005 i686
> GNU/Linux
>
> vservers are running.
>
> now monit reports the following:
>
> System 'dolomit'
>   status                            running
>   monitoring status                 monitored
>   load average                      [1.35] [1.32] [1.23]
>   cpu                               3.9%us 1.9%sy 0.0%wa
>   memory usage                      1257408 kB [60.5%]
>   data collected                    Mon Dec 19 20:34:16 2005
>
> while on /proc we got different values on memory usage.
>
> address@hidden:~$  sudo cat /proc/meminfo 
> MemTotal:      2075320 kB
> MemFree:         73108 kB
> Buffers:        111596 kB
> Cached:         633000 kB
> SwapCached:          4 kB
> Active:        1011856 kB
> Inactive:       407904 kB
> HighTotal:     1179392 kB
> HighFree:        63984 kB
> LowTotal:       895928 kB
> LowFree:          9124 kB
> SwapTotal:     2097144 kB
> SwapFree:      2097124 kB
> Dirty:             372 kB
> Writeback:          48 kB
> Mapped:         730040 kB
> Slab:           557744 kB
> CommitLimit:   3134804 kB
> Committed_AS:  1795656 kB
> PageTables:       6136 kB
> VmallocTotal:   114680 kB
> VmallocUsed:      8920 kB
> VmallocChunk:   105744 kB
>
> can this be an issue of SMP (2 CPU) or vserver-patch?
>
> we also tried to run monit in context 1 (which can see all processes): same
> result.
>
> how is the memory usage calculated?
>
> best regards,
> martin.
>
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>
> Martin Rueegg                             Owner and IT staff member
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> metaworx rueegg                          mailto:address@hidden
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