Virtualmin System Information Page displaying wrong RAM

MartinT · August 12, 2013, 6:25pm

Hello,

Recently I’ve noticed that the system information page in Virtualmin is displaying:

188 MB total, 149.97 MB used

whereas free -m shows the following:


             total       used       free     shared    buffers     cached
Mem:           752        340        411          0          0          0
-/+ buffers/cache:        340        411
Swap:         8192          0       8192

Anyone got any ideas?

Many thanks, Martin

Locutus · August 12, 2013, 7:14pm

That’s rather odd… Both that Virtualmin is so off for “total memory”, and your “free” output looks strange too. “cached” should never be higher than “used”, because “used” includes “cached”. What distribution are you using there? For me (Ubuntu 12.04 x64), the “free” output looks like so:

total used free shared buffers cached Mem: 2003 1854 148 0 24 574 -/+ buffers/cache: 1256 747 Swap: 1533 294 1239

Generally, Virtualmin’s “used” display is “used minus cached” in free, because memory used as file system cache is “semi-free”, i.e. it can be assigned to applications at any time.

EDIT: Sorry, I got confused by your linebreak-less output! I overlooked that your shared, buffers and cached is all at 0.

So yeah, Virtualmin indeed seems to be detecting the memory completely wrong there. WHat happens when you click the “Refresh information” link on top of the page? I’m not sure which command Webmin uses to determine memory stats, I suppose Eric or Jamie could fill us in there.

MartinT · August 12, 2013, 7:52pm

Thanks Locotus. Sorry about the confusion with the output of free!

I’m running Centos 5.9.

The output on the system information page is still wrong when I refresh…

It’s not a big problem - just something I noticed and wondered if anyone else had the same problem…

Thanks, Martin

Eric · August 12, 2013, 8:28pm

Howdy,

Hmm, are you using a VPS of some sort? If so, what kind of VPS is it?

Also, can you paste in the contents of /proc/meminfo?

Thanks!

-Eric

MartinT · August 12, 2013, 8:40pm

Hi Eric,

Yes, it’s a VPS running on OpenVZ:

contents of /proc/meminfo


MemTotal:       770048 kB
MemFree:        299908 kB
Buffers:             0 kB
Cached:              0 kB
SwapCached:          0 kB
Active:              0 kB
Inactive:            0 kB
HighTotal:           0 kB
HighFree:            0 kB
LowTotal:       770048 kB
LowFree:        299908 kB
SwapTotal:     8388608 kB
SwapFree:      8388608 kB
Dirty:               0 kB
Writeback:           0 kB
AnonPages:           0 kB
Mapped:              0 kB
Slab:                0 kB
PageTables:          0 kB
NFS_Unstable:        0 kB
Bounce:              0 kB
CommitLimit:         0 kB
Committed_AS:        0 kB
VmallocTotal:        0 kB
VmallocUsed:         0 kB
VmallocChunk:        0 kB
HugePages_Total:     0
HugePages_Free:      0
HugePages_Rsvd:      0
Hugepagesize:     2048 kB

and here’s free -m


             total       used       free     shared    buffers     cached
Mem:           752        460        291          0          0          0
-/+ buffers/cache:        460        291
Swap:         8192          0       8192

Thanks, Martin