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Operating Systems Linux Red Hat Memory leak
# 1  
Old 05-30-2011
Question Memory leak
Hi all
I am using RED HAT 5.4, and i am getting memory uses problem. when i use "sync;echo 3 > /proc/sys/vm/drop_cache" command the memory will release after 2,3 hour memory show 95%.
pls suggest right way.
thanks
# 2  
Old 05-30-2011
Linux uses every byte of memory available for buffers and caches .
95% usage is good , actually . I bet most of it used in FS cache .
# 3  
Old 05-30-2011
but i have 11 more red hat boxes but they not uses such mount of memory.
when it use 95 % memory its working become slow.
Last edited by reply.ravi; 05-30-2011 at 11:46 AM..
# 4  
Old 05-30-2011
Please post exactly what the problem is, not just "memory leak". Please post what numbers you're getting from what. cat /proc/meminfo would be a good start.

If it is a memory leak and not the usual "oh my god linux uses free memory for cache" freakout, you'll need to track down what's leaking memory, it's probably not "linux" that's leaking. ps aux | less would be a start, it'll show you a list of processes and how much memory they're using.
# 5  
Old 05-30-2011
i uses ps aux | less but it shows. Zero in all process. and see below meminfo
Code:
# cat /proc/meminfo
MemTotal:      7805952 kB
MemFree:        127120 kB
Buffers:        300884 kB
Cached:        6484184 kB
SwapCached:          0 kB
Active:        6390728 kB
Inactive:       645928 kB
HighTotal:           0 kB
HighFree:            0 kB
LowTotal:      7805952 kB
LowFree:        127120 kB
SwapTotal:    16892336 kB
SwapFree:     16892152 kB
Dirty:             132 kB
Writeback:          28 kB
AnonPages:      251588 kB
Mapped:          50312 kB
Slab:           356272 kB
PageTables:      14256 kB
NFS_Unstable:        0 kB
Bounce:              0 kB
CommitLimit:  20795312 kB
Committed_AS:  1069076 kB
VmallocTotal: 34359738367 kB
VmallocUsed:     12008 kB
VmallocChunk: 34359726335 kB

check the free memory its all about use.
Last edited by Scott; 05-30-2011 at 03:11 PM.. Reason: Please use code tags...
# 6  
Old 05-30-2011
6GB of total 8GB used in cache . Looks memory is not a problem here .
# 7  
Old 05-30-2011
Quote:
Originally Posted by reply.ravi
i uses ps aux | less but it shows. Zero in all process.
Could you post it anyway? Also try scrolling to the right to see if there's anything off the screen.
Code:
 and see below meminfo 

# cat /proc/meminfo
MemTotal:      7805952 kB
MemFree:        127120 kB
Buffers:        300884 kB
Cached:        6484184 kB

This is the usual "oh my god linux uses free memory for cache" freakout. Cached memory counts as free memory. All that messing you're doing with vm modes is only hurting the system, it may actually be causing the problem, you should undo it. The problem isn't related to low memory.
Last edited by Corona688; 05-30-2011 at 12:35 PM..
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