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Operating Systems Linux Red Hat Memory leak
# 29  
Old 06-01-2011
Quote:
Originally Posted by sixstrings
though I know windows has started to implement a similar strategy on its memory utilization.
I'm pretty sure Windows has been doing this for a long time. Its performance would be abysmal if it couldn't use disk cache. It just just shows cached mem as "free" to avoid the panic reaction we keep seeing elsewhere.
# 30  
Old 06-01-2011
Actually, it started with Windows Server 2008 and Windows 7 for the desktop.
# 31  
Old 06-01-2011
Are you serious? Windows had no proper disk cache before this? Smilie

That would explain a lot actually...

[edit] Did some testing with Windows XP, 3G of RAM, and a 1GB file. Windows XP obviously has disk cache to get read speeds of one gigabyte a second, though perhaps the terminology isn't quite the same across the board.
Last edited by Corona688; 06-03-2011 at 01:52 PM..
# 32  
Old 06-01-2011
It uses virtual pages, but buffers and cache is not disk cache, it is memory based cache. Windows did not do that.

Linux (and now windows) will keep data in memory cache to speed up performance. Memory is faster to access than physical disk (as you know).
# 33  
Old 06-02-2011
Quote:
Originally Posted by sixstrings
I am surprised no one has mentioned the free command:

total used free shared buffers cached
Mem: 1026056 912668 113388 0 89080 465688
-/+ buffers/cache: 357900 668156
Swap: 2031612 260 2031352

Normally, I use the following instead of free (and often alias it to memstat)

Code:
vmstat -s -S M | egrep 'mem|swap'

# 34  
Old 06-02-2011
This is the output of such command
Code:
# vmstat -s -S M | egrep 'mem|swap'
         7623 M total memory
         7518 M used memory
         2297 M active memory
         4613 M inactive memory
          104 M free memory
          293 M buffer memory
         6417 M swap cache
        16496 M total swap
            0 M used swap
        16496 M free swap
            0 pages swapped in
           46 pages swapped out

Last edited by Scott; 06-02-2011 at 05:46 AM.. Reason: Code tqgs
# 35  
Old 06-02-2011
You are using:

2297MB of memory

4613MB is usable, but committed to caches, etc, with another 103MB free and unallocated. You do NOT have a memory problem. You are not even swapping, and have allocated entirely too much for swap space. This is absolutely not a memory issue.
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