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9.3

How to understand the memory usage in Solaris ?

Asked by beer9 in Sun Solaris

I am very much addicted to use the 'top' of linux, but here in Solaris it looks convoluted.
Here is some of inputs from my system which I could figure out.

Physical Memory: 1GB
Swap space: 2GB

Output of swap -l is in block, whereas 1 block is 512 bytes, so the output of swap -l and 'format' of slice 1 is almost same.
Now the output of swap -s is in KB(not block) and it includes the part of physical memory(1024 MB) also
Used is 342092KB(334 MB) and available is 2204904KB(2153MB)

I can see physical swap is NOT used at all {as output of swap -l} and so I am subtracting 2GB from available space {2204904KB(2153MB)}
So I get 342092KB(334 MB) + {2204904KB(2153MB) - 2GB} = 334 MB + 105 MB=439 MB {Physical RAM}

But I have 1024 MB physical RAM, where is 585 MB {1024 - 439} RAM ??

Please let me know if my calculation is wrong! 
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bash-3.00# echo "::memstat" | mdb -k
Page Summary                Pages                MB  %Tot
------------     ----------------  ----------------  ----
Kernel                     112014               437   43%
Anon                        68509               267   26%
Exec and libs                5143                20    2%
Page cache                   6948                27    3%
Free (cachelist)            19276                75    7%
Free (freelist)             47804               186   18%
 
Total                      259694              1014
 
bash-3.00# swap -l
swapfile             dev  swaplo blocks   free
/dev/dsk/c0d0s1     102,1       8 4194288 4194288
 
#output of slice 1 from the format command
  1 unassigned    wu    1375 -  1636        2.01GB    (262/0/0)     4209030
 
bash-3.00# swap -s
total: 266084k bytes allocated + 76008k reserved = 342092k used, 2204904k available
 
bash-3.00# vmstat 
 kthr      memory            page            disk          faults      cpu
 r b w   swap  free  re  mf pi po fr de sr cd m6 m9 s0   in   sy   cs us sy id
 0 0 0 2397060 476264 87435 36205 72 0 2 0 96 39 0 0 -0 2636 91864 15145 11 47 42
 
bash-3.00# prtconf -v  | grep Memory
Memory size: 1023 Megabytes
[+][-]04/23/09 03:07 AM, ID: 24213314Accepted Solution

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Zone: Sun Solaris
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Solution Provided By: blu
Participating Experts: 2
Solution Grade: A
 
[+][-]04/22/09 10:07 PM, ID: 24211933Expert Comment

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