Howdy,
I was just trying to figure out how much RAM one of our servers has and I keep getting
weird answers. I thought it had either 256 or 512, really, I thought 256. But look at
the following:
[admin@csc003 admin]$ free -m
total used free shared buffers cached
Mem: 505 445 59 212 287 80
-/+ buffers/cache: 77 427
Swap: 258 2 256
I thought 505 MB couldn't be right so I tried top:
Mem: 517120K av, 458456K used, 58664K free, 219068K shrd, 294848K buff
Weird. So I started poking around in /proc:
[admin@csc003 admin]$ cat /proc/meminfo
total: used: free: shared: buffers: cached:
Mem: 529530880 469475328 60055552 224567296 301924352 84647936
Swap: 271392768 2220032 269172736
MemTotal: 517120 kB
MemFree: 58648 kB
MemShared: 219304 kB
Buffers: 294848 kB
Cached: 82664 kB
BigTotal: 0 kB
BigFree: 0 kB
SwapTotal: 265032 kB
SwapFree: 262864 kB
The math for that comes out weird no matter what I do:
[jw@garnet jw]$ python
Python 1.5.2 (#1, Feb 1 2000, 16:32:16) [GCC egcs-2.91.66 19990314/Linux (egcs- on
linux-i386
Copyright 1991-1995 Stichting Mathematisch Centrum, Amsterdam
>>> 529530880 / 1024
517120
>>> 529530880 / 1024 / 1024
505
>>> 529530880 / 1000 / 1000
529
>>> 529530880 / 1024 / 1000
517
>>>
Next I tried a cgi-bin script:
Main Memory : 511 megabytes
It seems to get it's info from the size of /proc/kcore
Can anyone explain why this isn't working out to exactly 512 MB? After all this is a
computer - is should be precise right down to the byte.
----------------------------------------------------
Jonathan Wilson
System Administrator
Cedar Creek Software
http://www.cedarcreeksoftware.com
Central Texas IT
http://www.centraltexasit.com
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